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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="`Accept-Language` header, defined in RFC 7231 §5.3.5"><title>AcceptLanguage in actix_web::http::header - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="actix_web" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0-nightly (bdbbb6c6a 2024-05-26)" data-channel="nightly" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="icon" href="https://actix.rs/favicon.ico"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../actix_web/index.html"><img src="https://actix.rs/img/logo.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../actix_web/index.html"><img src="https://actix.rs/img/logo.png" alt="logo"></a><h2><a href="../../../actix_web/index.html">actix_web</a><span class="version">4.6.0</span></h2></div><h2 class="location"><a href="#">AcceptLanguage</a></h2><div class="sidebar-elems"><section><h3><a href="#fields">Tuple Fields</a></h3><ul class="block structfield"><li><a href="#structfield.0">0</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.preference">preference</a></li><li><a href="#method.ranked">ranked</a></li></ul><h3><a href="#deref-methods-Vec%3CQualityItem%3CPreference%3CLanguageTag%3E%3E%3E">Methods from Deref&lt;Target=Vec&lt;QualityItem&lt;Preference&lt;LanguageTag&gt;&gt;&gt;&gt;</a></h3><ul class="block deref-methods"><li><a href="#method.allocator">allocator</a></li><li><a href="#method.append">append</a></li><li><a href="#method.as_mut_ptr">as_mut_ptr</a></li><li><a href="#method.as_mut_slice">as_mut_slice</a></li><li><a href="#method.as_ptr">as_ptr</a></li><li><a href="#method.as_slice">as_slice</a></li><li><a href="#method.capacity">capacity</a></li><li><a href="#method.clear">clear</a></li><li><a href="#method.dedup">dedup</a></li><li><a href="#method.dedup_by">dedup_by</a></li><li><a href="#method.dedup_by_key">dedup_by_key</a></li><li><a href="#method.drain">drain</a></li><li><a href="#method.extend_from_slice">extend_from_slice</a></li><li><a href="#method.extend_from_within">extend_from_within</a></li><li><a href="#method.extract_if">extract_if</a></li><li><a href="#method.insert">insert</a></li><li><a href="#method.is_empty">is_empty</a></li><li><a href="#method.len">len</a></li><li><a href="#method.pop">pop</a></li><li><a href="#method.pop_if">pop_if</a></li><li><a href="#method.push">push</a></li><li><a href="#method.push_within_capacity">push_within_capacity</a></li><li><a href="#method.remove">remove</a></li><li><a href="#method.reserve">reserve</a></li><li><a href="#method.reserve_exact">reserve_exact</a></li><li><a href="#method.resize">resize</a></li><li><a href="#method.resize_with">resize_with</a></li><li><a href="#method.retain">retain</a></li><li><a href="#method.retain_mut">retain_mut</a></li><li><a href="#method.set_len">set_len</a></li><li><a href="#method.shrink_to">shrink_to</a></li><li><a href="#method.shrink_to_fit">shrink_to_fit</a></li><li><a href="#method.spare_capacity_mut">spare_capacity_mut</a></li><li><a href="#method.splice">splice</a></li><li><a href="#method.split_at_spare_mut">split_at_spare_mut</a></li><li><a href="#method.split_off">split_off</a></li><li><a href="#method.swap_remove">swap_remove</a></li><li><a href="#method.truncate">truncate</a></li><li><a href="#method.try_reserve">try_reserve</a></li><li><a href="#method.try_reserve_exact">try_reserve_exact</a></li></ul><h3><a href="#deref-methods-%5BT%5D">Methods from Deref&lt;Target=[T]&gt;</a></h3><ul class="block deref-methods"><li><a href="#method.align_to">align_to</a></li><li><a href="#method.align_to_mut">align_to_mut</a></li><li><a href="#method.array_chunks">array_chunks</a></li><li><a href="#method.array_chunks_mut">array_chunks_mut</a></li><li><a href="#method.array_windows">array_windows</a></li><li><a href="#method.as_ascii">as_ascii</a></li><li><a href="#method.as_ascii_unchecked">as_ascii_unchecked</a></li><li><a href="#method.as_bytes">as_bytes</a></li><li><a href="#method.as_chunks">as_chunks</a></li><li><a href="#method.as_chunks_mut">as_chunks_mut</a></li><li><a href="#method.as_chunks_unchecked">as_chunks_unchecked</a></li><li><a href="#method.as_chunks_unchecked_mut">as_chunks_unchecked_mut</a></li><li><a href="#method.as_flattened">as_flattened</a></li><li><a href="#method.as_flattened_mut">as_flattened_mut</a></li><li><a href="#method.as_mut_ptr-1">as_mut_ptr</a></li><li><a href="#method.as_mut_ptr_range">as_mut_ptr_range</a></li><li><a href="#method.as_ptr-1">as_ptr</a></li><li><a href="#method.as_ptr_range">as_ptr_range</a></li><li><a href="#method.as_rchunks">as_rchunks</a></li><li><a href="#method.as_rchunks_mut">as_rchunks_mut</a></li><li><a href="#method.as_simd">as_simd</a></li><li><a href="#method.as_simd_mut">as_simd_mut</a></li><li><a href="#method.as_str">as_str</a></li><li><a href="#method.binary_search">binary_search</a></li><li><a href="#method.binary_search_by">binary_search_by</a></li><li><a href="#method.binary_search_by_key">binary_search_by_key</a></li><li><a href="#method.chunk_by">chunk_by</a></li><li><a href="#method.chunk_by_mut">chunk_by_mut</a></li><li><a href="#method.chunks">chunks</a></li><li><a href="#method.chunks_exact">chunks_exact</a></li><li><a href="#method.chunks_exact_mut">chunks_exact_mut</a></li><li><a href="#method.chunks_mut">chunks_mut</a></li><li><a href="#method.clone_from_slice">clone_from_slice</a></li><li><a href="#method.concat">concat</a></li><li><a href="#method.connect">connect</a></li><li><a href="#method.contains">contains</a></li><li><a href="#method.copy_from_slice">copy_from_slice</a></li><li><a href="#method.copy_within">copy_within</a></li><li><a href="#method.ends_with">ends_with</a></li><li><a href="#method.eq_ignore_ascii_case">eq_ignore_ascii_case</a></li><li><a href="#method.escape_ascii">escape_ascii</a></li><li><a href="#method.fill">fill</a></li><li><a href="#method.fill_with">fill_with</a></li><li><a href="#method.first">first</a></li><li><a href="#method.first_chunk">first_chunk</a></li><li><a href="#method.first_chunk_mut">first_chunk_mut</a></li><li><a href="#method.first_mut">first_mut</a></li><li><a href="#method.get">get</a></li><li><a href="#method.get_many_mut">get_many_mut</a></li><li><a href="#method.get_many_unchecked_mut">get_many_unchecked_mut</a></li><li><a href="#method.get_mut">get_mut</a></li><li><a href="#method.get_unchecked">get_unchecked</a></li><li><a href="#method.get_unchecked_mut">get_unchecked_mut</a></li><li><a href="#method.is_ascii">is_ascii</a></li><li><a href="#method.is_empty-1">is_empty</a></li><li><a href="#method.is_sorted">is_sorted</a></li><li><a href="#method.is_sorted_by">is_sorted_by</a></li><li><a href="#method.is_sorted_by_key">is_sorted_by_key</a></li><li><a href="#method.iter">iter</a></li><li><a href="#method.iter_mut">iter_mut</a></li><li><a href="#method.join">join</a></li><li><a href="#method.last">last</a></li><li><a href="#method.last_chunk">last_chunk</a></li><li><a href="#method.last_chunk_mut">last_chunk_mut</a></li><li><a href="#method.last_mut">last_mut</a></li><li><a href="#method.len-1">len</a></li><li><a href="#method.make_ascii_lowercase">make_ascii_lowercase</a></li><li><a href="#method.make_ascii_uppercase">make_ascii_uppercase</a></li><li><a href="#method.partition_dedup">partition_dedup</a></li><li><a href="#method.partition_dedup_by">partition_dedup_by</a></li><li><a href="#method.partition_dedup_by_key">partition_dedup_by_key</a></li><li><a href="#method.partition_point">partition_point</a></li><li><a href="#method.rchunks">rchunks</a></li><li><a href="#method.rchunks_exact">rchunks_exact</a></li><li><a href="#method.rchunks_exact_mut">rchunks_exact_mut</a></li><li><a href="#method.rchunks_mut">rchunks_mut</a></li><li><a href="#method.repeat">repeat</a></li><li><a href="#method.reverse">reverse</a></li><li><a href="#method.rotate_left">rotate_left</a></li><li><a href="#method.rotate_right">rotate_right</a></li><li><a href="#method.rsplit">rsplit</a></li><li><a href="#method.rsplit_mut">rsplit_mut</a></li><li><a href="#method.rsplit_once">rsplit_once</a></li><li><a href="#method.rsplitn">rsplitn</a></li><li><a href="#method.rsplitn_mut">rsplitn_mut</a></li><li><a href="#method.select_nth_unstable">select_nth_unstable</a></li><li><a href="#method.select_nth_unstable_by">select_nth_unstable_by</a></li><li><a href="#method.select_nth_unstable_by_key">select_nth_unstable_by_key</a></li><li><a href="#method.sort">sort</a></li><li><a href="#method.sort_by">sort_by</a></li><li><a href="#method.sort_by_cached_key">sort_by_cached_key</a></li><li><a href="#method.sort_by_key">sort_by_key</a></li><li><a href="#method.sort_floats">sort_floats</a></li><li><a href="#method.sort_floats-1">sort_floats</a></li><li><a href="#method.sort_unstable">sort_unstable</a></li><li><a href="#method.sort_unstable_by">sort_unstable_by</a></li><li><a href="#method.sort_unstable_by_key">sort_unstable_by_key</a></li><li><a href="#method.split">split</a></li><li><a href="#method.split_at">split_at</a></li><li><a href="#method.split_at_checked">split_at_checked</a></li><li><a href="#method.split_at_mut">split_at_mut</a></li><li><a href="#method.split_at_mut_checked">split_at_mut_checked</a></li><li><a href="#method.split_at_mut_unchecked">split_at_mut_unchecked</a></li><li><a href="#method.split_at_unchecked">split_at_unchecked</a></li><li><a href="#method.split_first">split_first</a></li><li><a href="#method.split_first_chunk">split_first_chunk</a></li><li><a href="#method.split_first_chunk_mut">split_first_chunk_mut</a></li><li><a href="#method.split_first_mut">split_first_mut</a></li><li><a href="#method.split_inclusive">split_inclusive</a></li><li><a href="#method.split_inclusive_mut">split_inclusive_mut</a></li><li><a href="#method.split_last">split_last</a></li><li><a href="#method.split_last_chunk">split_last_chunk</a></li><li><a href="#method.split_last_chunk_mut">split_last_chunk_mut</a></li><li><a href="#method.split_last_mut">split_last_mut</a></li><li><a href="#method.split_mut">split_mut</a></li><li><a href="#method.split_once">split_once</a></li><li><a href="#method.splitn">splitn</a></li><li><a href="#method.splitn_mut">splitn_mut</a></li><li><a href="#method.starts_with">starts_with</a></li><li><a href="#method.strip_prefix">strip_prefix</a></li><li><a href="#method.strip_suffix">strip_suffix</a></li><li><a href="#method.swap">swap</a></li><li><a href="#method.swap_unchecked">swap_unchecked</a></li><li><a href="#method.swap_with_slice">swap_with_slice</a></li><li><a href="#method.take">take</a></li><li><a href="#method.take_first">take_first</a></li><li><a href="#method.take_first_mut">take_first_mut</a></li><li><a href="#method.take_last">take_last</a></li><li><a href="#method.take_last_mut">take_last_mut</a></li><li><a href="#method.take_mut">take_mut</a></li><li><a href="#method.to_ascii_lowercase">to_ascii_lowercase</a></li><li><a href="#method.to_ascii_uppercase">to_ascii_uppercase</a></li><li><a href="#method.to_vec">to_vec</a></li><li><a href="#method.to_vec_in">to_vec_in</a></li><li><a href="#method.trim_ascii">trim_ascii</a></li><li><a href="#method.trim_ascii_end">trim_ascii_end</a></li><li><a href="#method.trim_ascii_start">trim_ascii_start</a></li><li><a href="#method.utf8_chunks">utf8_chunks</a></li><li><a href="#method.windows">windows</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-AcceptLanguage">Clone</a></li><li><a href="#impl-Debug-for-AcceptLanguage">Debug</a></li><li><a href="#impl-Deref-for-AcceptLanguage">Deref</a></li><li><a href="#impl-DerefMut-for-AcceptLanguage">DerefMut</a></li><li><a href="#impl-Display-for-AcceptLanguage">Display</a></li><li><a href="#impl-Eq-for-AcceptLanguage">Eq</a></li><li><a href="#impl-Header-for-AcceptLanguage">Header</a></li><li><a href="#impl-PartialEq-for-AcceptLanguage">PartialEq</a></li><li><a href="#impl-StructuralPartialEq-for-AcceptLanguage">StructuralPartialEq</a></li><li><a href="#impl-TryIntoHeaderValue-for-AcceptLanguage">TryIntoHeaderValue</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-AcceptLanguage">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-AcceptLanguage">RefUnwindSafe</a></li><li><a href="#impl-Send-for-AcceptLanguage">Send</a></li><li><a href="#impl-Sync-for-AcceptLanguage">Sync</a></li><li><a href="#impl-Unpin-for-AcceptLanguage">Unpin</a></li><li><a href="#impl-UnwindSafe-for-AcceptLanguage">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow&lt;T&gt;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&lt;T&gt;</a></li><li><a href="#impl-Equivalent%3CK%3E-for-Q">Equivalent&lt;K&gt;</a></li><li><a href="#impl-Equivalent%3CK%3E-for-Q-1">Equivalent&lt;K&gt;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&lt;T&gt;</a></li><li><a href="#impl-Instrument-for-T">Instrument</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into&lt;U&gt;</a></li><li><a href="#impl-Same-for-T">Same</a></li><li><a href="#impl-ToOwned-for-T">ToOwned</a></li><li><a href="#impl-ToString-for-T">ToString</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom&lt;U&gt;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto&lt;U&gt;</a></li><li><a href="#impl-TryIntoHeaderPair-for-T">TryIntoHeaderPair</a></li><li><a href="#impl-VZip%3CV%3E-for-T">VZip&lt;V&gt;</a></li><li><a href="#impl-WithSubscriber-for-T">WithSubscriber</a></li></ul></section><h2><a href="index.html">In actix_web::http::header</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../../index.html">actix_web</a>::<wbr><a href="../index.html">http</a>::<wbr><a href="index.html">header</a>::<wbr><a class="struct" href="#">AcceptLanguage</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct AcceptLanguage(pub <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="struct" href="struct.QualityItem.html" title="struct actix_web::http::header::QualityItem">QualityItem</a>&lt;<a class="enum" href="enum.Preference.html" title="enum actix_web::http::header::Preference">Preference</a>&lt;<a class="struct" href="struct.LanguageTag.html" title="struct actix_web::http::header::LanguageTag">LanguageTag</a>&gt;&gt;&gt;);</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p><code>Accept-Language</code> header, defined
in <a href="https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.5">RFC 7231 §5.3.5</a></p>
<p>The <code>Accept-Language</code> header field can be used by user agents to indicate the set of natural
languages that are preferred in the response.</p>
<p>The <code>Accept-Language</code> header is defined in
<a href="https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.5">RFC 7231 §5.3.5</a> using language
ranges defined in <a href="https://datatracker.ietf.org/doc/html/rfc4647#section-2.1">RFC 4647 §2.1</a>.</p>
<h2 id="abnf"><a class="doc-anchor" href="#abnf">§</a>ABNF</h2><div class="example-wrap"><pre class="language-plain"><code>Accept-Language = 1#( language-range [ weight ] )
language-range = (1*8ALPHA *(&quot;-&quot; 1*8alphanum)) / &quot;*&quot;
alphanum = ALPHA / DIGIT
weight = OWS &quot;;&quot; OWS &quot;q=&quot; qvalue
qvalue = ( &quot;0&quot; [ &quot;.&quot; 0*3DIGIT ] )
/ ( &quot;1&quot; [ &quot;.&quot; 0*3(&quot;0&quot;) ] )
</code></pre></div><h2 id="example-values"><a class="doc-anchor" href="#example-values">§</a>Example Values</h2>
<ul>
<li><code>da, en-gb;q=0.8, en;q=0.7</code></li>
<li><code>en-us;q=1.0, en;q=0.5, fr</code></li>
<li><code>fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5</code></li>
</ul>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>actix_web::HttpResponse;
<span class="kw">use </span>actix_web::http::header::{AcceptLanguage, QualityItem};
<span class="kw">let </span><span class="kw-2">mut </span>builder = HttpResponse::Ok();
builder.insert_header(
AcceptLanguage(<span class="macro">vec!</span>[
<span class="string">"en-US"</span>.parse().unwrap(),
])
);</code></pre></div>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>actix_web::HttpResponse;
<span class="kw">use </span>actix_web::http::header::{AcceptLanguage, QualityItem, q};
<span class="kw">let </span><span class="kw-2">mut </span>builder = HttpResponse::Ok();
builder.insert_header(
AcceptLanguage(<span class="macro">vec!</span>[
<span class="string">"da"</span>.parse().unwrap(),
<span class="string">"en-GB;q=0.8"</span>.parse().unwrap(),
<span class="string">"en;q=0.7"</span>.parse().unwrap(),
])
);</code></pre></div>
</div></details><h2 id="fields" class="fields section-header">Tuple Fields<a href="#fields" class="anchor">§</a></h2><span id="structfield.0" class="structfield section-header"><a href="#structfield.0" class="anchor field">§</a><code>0: <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="struct" href="struct.QualityItem.html" title="struct actix_web::http::header::QualityItem">QualityItem</a>&lt;<a class="enum" href="enum.Preference.html" title="enum actix_web::http::header::Preference">Preference</a>&lt;<a class="struct" href="struct.LanguageTag.html" title="struct actix_web::http::header::LanguageTag">LanguageTag</a>&gt;&gt;&gt;</code></span><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#95-142">source</a><a href="#impl-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.preference" class="method"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#104-121">source</a><h4 class="code-header">pub fn <a href="#method.preference" class="fn">preference</a>(&amp;self) -&gt; <a class="enum" href="enum.Preference.html" title="enum actix_web::http::header::Preference">Preference</a>&lt;<a class="struct" href="struct.LanguageTag.html" title="struct actix_web::http::header::LanguageTag">LanguageTag</a>&gt;</h4></section></summary><div class="docblock"><p>Extracts the most preferable language, accounting for <a href="https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2">q-factor weighting</a>.</p>
<p>If no q-factors are provided, the first language is chosen. Note that items without
q-factors are given the maximum preference value.</p>
<p>As per the spec, returns <a href="enum.Preference.html#variant.Any" title="variant actix_web::http::header::Preference::Any"><code>Preference::Any</code></a> if contained list is empty.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.ranked" class="method"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#127-141">source</a><h4 class="code-header">pub fn <a href="#method.ranked" class="fn">ranked</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="enum" href="enum.Preference.html" title="enum actix_web::http::header::Preference">Preference</a>&lt;<a class="struct" href="struct.LanguageTag.html" title="struct actix_web::http::header::LanguageTag">LanguageTag</a>&gt;&gt;</h4></section></summary><div class="docblock"><p>Returns a sorted list of languages from highest to lowest precedence, accounting
for <a href="https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2">q-factor weighting</a>.</p>
</div></details></div></details></div><h2 id="deref-methods-Vec%3CQualityItem%3CPreference%3CLanguageTag%3E%3E%3E" class="section-header"><span>Methods from <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a>&lt;Target = <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="struct" href="struct.QualityItem.html" title="struct actix_web::http::header::QualityItem">QualityItem</a>&lt;<a class="enum" href="enum.Preference.html" title="enum actix_web::http::header::Preference">Preference</a>&lt;<a class="struct" href="struct.LanguageTag.html" title="struct actix_web::http::header::LanguageTag">LanguageTag</a>&gt;&gt;&gt;&gt;</span><a href="#deref-methods-Vec%3CQualityItem%3CPreference%3CLanguageTag%3E%3E%3E" class="anchor">§</a></h2><div id="deref-methods-Vec%3CQualityItem%3CPreference%3CLanguageTag%3E%3E%3E-1" class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.capacity" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#948">source</a></span><h4 class="code-header">pub fn <a href="#method.capacity" class="fn">capacity</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the total number of elements the vector can hold without
reallocating.</p>
<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec: Vec&lt;i32&gt; = Vec::with_capacity(<span class="number">10</span>);
vec.push(<span class="number">42</span>);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">10</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.reserve" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#971">source</a></span><h4 class="code-header">pub fn <a href="#method.reserve" class="fn">reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Reserves capacity for at least <code>additional</code> more elements to be inserted
in the given <code>Vec&lt;T&gt;</code>. The collection may reserve more space to
speculatively avoid frequent reallocations. After calling <code>reserve</code>,
capacity will be greater than or equal to <code>self.len() + additional</code>.
Does nothing if capacity is already sufficient.</p>
<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
<p>Panics if the new capacity exceeds <code>isize::MAX</code> <em>bytes</em>.</p>
<h5 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>];
vec.reserve(<span class="number">10</span>);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">11</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.reserve_exact" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1001">source</a></span><h4 class="code-header">pub fn <a href="#method.reserve_exact" class="fn">reserve_exact</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Reserves the minimum capacity for at least <code>additional</code> more elements to
be inserted in the given <code>Vec&lt;T&gt;</code>. Unlike <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.reserve" title="method alloc::vec::Vec::reserve"><code>reserve</code></a>, this will not
deliberately over-allocate to speculatively avoid frequent allocations.
After calling <code>reserve_exact</code>, capacity will be greater than or equal to
<code>self.len() + additional</code>. Does nothing if the capacity is already
sufficient.</p>
<p>Note that the allocator may give the collection more space than it
requests. Therefore, capacity can not be relied upon to be precisely
minimal. Prefer <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.reserve" title="method alloc::vec::Vec::reserve"><code>reserve</code></a> if future insertions are expected.</p>
<h5 id="panics-1"><a class="doc-anchor" href="#panics-1">§</a>Panics</h5>
<p>Panics if the new capacity exceeds <code>isize::MAX</code> <em>bytes</em>.</p>
<h5 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>];
vec.reserve_exact(<span class="number">10</span>);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">11</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.try_reserve" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.57.0">1.57.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1038">source</a></span><h4 class="code-header">pub fn <a href="#method.try_reserve" class="fn">try_reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/collections/struct.TryReserveError.html" title="struct alloc::collections::TryReserveError">TryReserveError</a>&gt;</h4></section></summary><div class="docblock"><p>Tries to reserve capacity for at least <code>additional</code> more elements to be inserted
in the given <code>Vec&lt;T&gt;</code>. The collection may reserve more space to speculatively avoid
frequent reallocations. After calling <code>try_reserve</code>, capacity will be
greater than or equal to <code>self.len() + additional</code> if it returns
<code>Ok(())</code>. Does nothing if capacity is already sufficient. This method
preserves the contents even if an error occurs.</p>
<h5 id="errors"><a class="doc-anchor" href="#errors">§</a>Errors</h5>
<p>If the capacity overflows, or the allocator reports a failure, then an error
is returned.</p>
<h5 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::collections::TryReserveError;
<span class="kw">fn </span>process_data(data: <span class="kw-2">&amp;</span>[u32]) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;u32&gt;, TryReserveError&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>output = Vec::new();
<span class="comment">// Pre-reserve the memory, exiting if we can't
</span>output.try_reserve(data.len())<span class="question-mark">?</span>;
<span class="comment">// Now we know this can't OOM in the middle of our complex work
</span>output.extend(data.iter().map(|<span class="kw-2">&amp;</span>val| {
val * <span class="number">2 </span>+ <span class="number">5 </span><span class="comment">// very complicated
</span>}));
<span class="prelude-val">Ok</span>(output)
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.try_reserve_exact" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.57.0">1.57.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1081">source</a></span><h4 class="code-header">pub fn <a href="#method.try_reserve_exact" class="fn">try_reserve_exact</a>(
&amp;mut self,
additional: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/collections/struct.TryReserveError.html" title="struct alloc::collections::TryReserveError">TryReserveError</a>&gt;</h4></section></summary><div class="docblock"><p>Tries to reserve the minimum capacity for at least <code>additional</code>
elements to be inserted in the given <code>Vec&lt;T&gt;</code>. Unlike <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.try_reserve" title="method alloc::vec::Vec::try_reserve"><code>try_reserve</code></a>,
this will not deliberately over-allocate to speculatively avoid frequent
allocations. After calling <code>try_reserve_exact</code>, capacity will be greater
than or equal to <code>self.len() + additional</code> if it returns <code>Ok(())</code>.
Does nothing if the capacity is already sufficient.</p>
<p>Note that the allocator may give the collection more space than it
requests. Therefore, capacity can not be relied upon to be precisely
minimal. Prefer <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.try_reserve" title="method alloc::vec::Vec::try_reserve"><code>try_reserve</code></a> if future insertions are expected.</p>
<h5 id="errors-1"><a class="doc-anchor" href="#errors-1">§</a>Errors</h5>
<p>If the capacity overflows, or the allocator reports a failure, then an error
is returned.</p>
<h5 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::collections::TryReserveError;
<span class="kw">fn </span>process_data(data: <span class="kw-2">&amp;</span>[u32]) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;u32&gt;, TryReserveError&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>output = Vec::new();
<span class="comment">// Pre-reserve the memory, exiting if we can't
</span>output.try_reserve_exact(data.len())<span class="question-mark">?</span>;
<span class="comment">// Now we know this can't OOM in the middle of our complex work
</span>output.extend(data.iter().map(|<span class="kw-2">&amp;</span>val| {
val * <span class="number">2 </span>+ <span class="number">5 </span><span class="comment">// very complicated
</span>}));
<span class="prelude-val">Ok</span>(output)
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shrink_to_fit" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1104">source</a></span><h4 class="code-header">pub fn <a href="#method.shrink_to_fit" class="fn">shrink_to_fit</a>(&amp;mut self)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Shrinks the capacity of the vector as much as possible.</p>
<p>The behavior of this method depends on the allocator, which may either shrink the vector
in-place or reallocate. The resulting vector might still have some excess capacity, just as
is the case for <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.with_capacity" title="associated function alloc::vec::Vec::with_capacity"><code>with_capacity</code></a>. See <a href="https://doc.rust-lang.org/nightly/core/alloc/trait.Allocator.html#method.shrink" title="method core::alloc::Allocator::shrink"><code>Allocator::shrink</code></a> for more details.</p>
<h5 id="examples-6"><a class="doc-anchor" href="#examples-6">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::with_capacity(<span class="number">10</span>);
vec.extend([<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">10</span>);
vec.shrink_to_fit();
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">3</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.shrink_to" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.56.0">1.56.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1133">source</a></span><h4 class="code-header">pub fn <a href="#method.shrink_to" class="fn">shrink_to</a>(&amp;mut self, min_capacity: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Shrinks the capacity of the vector with a lower bound.</p>
<p>The capacity will remain at least as large as both the length
and the supplied value.</p>
<p>If the current capacity is less than the lower limit, this is a no-op.</p>
<h5 id="examples-7"><a class="doc-anchor" href="#examples-7">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::with_capacity(<span class="number">10</span>);
vec.extend([<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">10</span>);
vec.shrink_to(<span class="number">4</span>);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">4</span>);
vec.shrink_to(<span class="number">0</span>);
<span class="macro">assert!</span>(vec.capacity() &gt;= <span class="number">3</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.truncate" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1219">source</a></span><h4 class="code-header">pub fn <a href="#method.truncate" class="fn">truncate</a>(&amp;mut self, len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Shortens the vector, keeping the first <code>len</code> elements and dropping
the rest.</p>
<p>If <code>len</code> is greater or equal to the vector’s current length, this has
no effect.</p>
<p>The <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.drain" title="method alloc::vec::Vec::drain"><code>drain</code></a> method can emulate <code>truncate</code>, but causes the excess
elements to be returned instead of dropped.</p>
<p>Note that this method has no effect on the allocated capacity
of the vector.</p>
<h5 id="examples-8"><a class="doc-anchor" href="#examples-8">§</a>Examples</h5>
<p>Truncating a five element vector to two elements:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
vec.truncate(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>]);</code></pre></div>
<p>No truncation occurs when <code>len</code> is greater than the vector’s current
length:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
vec.truncate(<span class="number">8</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
<p>Truncating when <code>len == 0</code> is equivalent to calling the <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.clear" title="method alloc::vec::Vec::clear"><code>clear</code></a>
method.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
vec.truncate(<span class="number">0</span>);
<span class="macro">assert_eq!</span>(vec, []);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_slice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.7.0">1.7.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1254">source</a></span><h4 class="code-header">pub fn <a href="#method.as_slice" class="fn">as_slice</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a></h4></section></summary><div class="docblock"><p>Extracts a slice containing the entire vector.</p>
<p>Equivalent to <code>&amp;s[..]</code>.</p>
<h5 id="examples-9"><a class="doc-anchor" href="#examples-9">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::io::{<span class="self">self</span>, Write};
<span class="kw">let </span>buffer = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>];
io::sink().write(buffer.as_slice()).unwrap();</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_mut_slice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.7.0">1.7.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1271">source</a></span><h4 class="code-header">pub fn <a href="#method.as_mut_slice" class="fn">as_mut_slice</a>(&amp;mut self) -&gt; &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a></h4></section></summary><div class="docblock"><p>Extracts a mutable slice of the entire vector.</p>
<p>Equivalent to <code>&amp;mut s[..]</code>.</p>
<h5 id="examples-10"><a class="doc-anchor" href="#examples-10">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::io::{<span class="self">self</span>, Read};
<span class="kw">let </span><span class="kw-2">mut </span>buffer = <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">3</span>];
io::repeat(<span class="number">0b101</span>).read_exact(buffer.as_mut_slice()).unwrap();</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_ptr" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.37.0">1.37.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1329">source</a></span><h4 class="code-header">pub fn <a href="#method.as_ptr" class="fn">as_ptr</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const T</a></h4></section></summary><div class="docblock"><p>Returns a raw pointer to the vector’s buffer, or a dangling raw pointer
valid for zero sized reads if the vector didn’t allocate.</p>
<p>The caller must ensure that the vector outlives the pointer this
function returns, or else it will end up pointing to garbage.
Modifying the vector may cause its buffer to be reallocated,
which would also make any pointers to it invalid.</p>
<p>The caller must also ensure that the memory the pointer (non-transitively) points to
is never written to (except inside an <code>UnsafeCell</code>) using this pointer or any pointer
derived from it. If you need to mutate the contents of the slice, use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.as_mut_ptr" title="method alloc::vec::Vec::as_mut_ptr"><code>as_mut_ptr</code></a>.</p>
<p>This method guarantees that for the purpose of the aliasing model, this method
does not materialize a reference to the underlying slice, and thus the returned pointer
will remain valid when mixed with other calls to <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.as_ptr" title="method alloc::vec::Vec::as_ptr"><code>as_ptr</code></a> and <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.as_mut_ptr" title="method alloc::vec::Vec::as_mut_ptr"><code>as_mut_ptr</code></a>.
Note that calling other methods that materialize mutable references to the slice,
or mutable references to specific elements you are planning on accessing through this pointer,
as well as writing to those elements, may still invalidate this pointer.
See the second example below for how this guarantee can be used.</p>
<h5 id="examples-11"><a class="doc-anchor" href="#examples-11">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">let </span>x_ptr = x.as_ptr();
<span class="kw">unsafe </span>{
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..x.len() {
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>x_ptr.add(i), <span class="number">1 </span>&lt;&lt; i);
}
}</code></pre></div>
<p>Due to the aliasing guarantee, the following code is legal:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">let </span>ptr1 = v.as_ptr();
<span class="kw">let _ </span>= ptr1.read();
<span class="kw">let </span>ptr2 = v.as_mut_ptr().offset(<span class="number">2</span>);
ptr2.write(<span class="number">2</span>);
<span class="comment">// Notably, the write to `ptr2` did *not* invalidate `ptr1`
// because it mutated a different element:
</span><span class="kw">let _ </span>= ptr1.read();
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_mut_ptr" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.37.0">1.37.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1389">source</a></span><h4 class="code-header">pub fn <a href="#method.as_mut_ptr" class="fn">as_mut_ptr</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut T</a></h4></section></summary><div class="docblock"><p>Returns an unsafe mutable pointer to the vector’s buffer, or a dangling
raw pointer valid for zero sized reads if the vector didn’t allocate.</p>
<p>The caller must ensure that the vector outlives the pointer this
function returns, or else it will end up pointing to garbage.
Modifying the vector may cause its buffer to be reallocated,
which would also make any pointers to it invalid.</p>
<p>This method guarantees that for the purpose of the aliasing model, this method
does not materialize a reference to the underlying slice, and thus the returned pointer
will remain valid when mixed with other calls to <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.as_ptr" title="method alloc::vec::Vec::as_ptr"><code>as_ptr</code></a> and <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.as_mut_ptr" title="method alloc::vec::Vec::as_mut_ptr"><code>as_mut_ptr</code></a>.
Note that calling other methods that materialize references to the slice,
or references to specific elements you are planning on accessing through this pointer,
may still invalidate this pointer.
See the second example below for how this guarantee can be used.</p>
<h5 id="examples-12"><a class="doc-anchor" href="#examples-12">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// Allocate vector big enough for 4 elements.
</span><span class="kw">let </span>size = <span class="number">4</span>;
<span class="kw">let </span><span class="kw-2">mut </span>x: Vec&lt;i32&gt; = Vec::with_capacity(size);
<span class="kw">let </span>x_ptr = x.as_mut_ptr();
<span class="comment">// Initialize elements via raw pointer writes, then set length.
</span><span class="kw">unsafe </span>{
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..size {
<span class="kw-2">*</span>x_ptr.add(i) = i <span class="kw">as </span>i32;
}
x.set_len(size);
}
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;*</span>x, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
<p>Due to the aliasing guarantee, the following code is legal:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">0</span>];
<span class="kw">let </span>ptr1 = v.as_mut_ptr();
ptr1.write(<span class="number">1</span>);
<span class="kw">let </span>ptr2 = v.as_mut_ptr();
ptr2.write(<span class="number">2</span>);
<span class="comment">// Notably, the write to `ptr2` did *not* invalidate `ptr1`:
</span>ptr1.write(<span class="number">3</span>);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.allocator" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1398">source</a><h4 class="code-header">pub fn <a href="#method.allocator" class="fn">allocator</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;A</a></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>allocator_api</code>)</span></div></span></summary><div class="docblock"><p>Returns a reference to the underlying allocator.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.set_len" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1482">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.set_len" class="fn">set_len</a>(&amp;mut self, new_len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Forces the length of the vector to <code>new_len</code>.</p>
<p>This is a low-level operation that maintains none of the normal
invariants of the type. Normally changing the length of a vector
is done using one of the safe operations instead, such as
<a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.truncate" title="method alloc::vec::Vec::truncate"><code>truncate</code></a>, <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.resize" title="method alloc::vec::Vec::resize"><code>resize</code></a>, <a href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.Extend.html#tymethod.extend" title="method core::iter::traits::collect::Extend::extend"><code>extend</code></a>, or <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.clear" title="method alloc::vec::Vec::clear"><code>clear</code></a>.</p>
<h5 id="safety"><a class="doc-anchor" href="#safety">§</a>Safety</h5>
<ul>
<li><code>new_len</code> must be less than or equal to <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.capacity" title="method alloc::vec::Vec::capacity"><code>capacity()</code></a>.</li>
<li>The elements at <code>old_len..new_len</code> must be initialized.</li>
</ul>
<h5 id="examples-13"><a class="doc-anchor" href="#examples-13">§</a>Examples</h5>
<p>This method can be useful for situations in which the vector
is serving as a buffer for other code, particularly over FFI:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">pub fn </span>get_dictionary(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Vec&lt;u8&gt;&gt; {
<span class="comment">// Per the FFI method's docs, "32768 bytes is always enough".
</span><span class="kw">let </span><span class="kw-2">mut </span>dict = Vec::with_capacity(<span class="number">32_768</span>);
<span class="kw">let </span><span class="kw-2">mut </span>dict_length = <span class="number">0</span>;
<span class="comment">// SAFETY: When `deflateGetDictionary` returns `Z_OK`, it holds that:
// 1. `dict_length` elements were initialized.
// 2. `dict_length` &lt;= the capacity (32_768)
// which makes `set_len` safe to call.
</span><span class="kw">unsafe </span>{
<span class="comment">// Make the FFI call...
</span><span class="kw">let </span>r = deflateGetDictionary(<span class="self">self</span>.strm, dict.as_mut_ptr(), <span class="kw-2">&amp;mut </span>dict_length);
<span class="kw">if </span>r == Z_OK {
<span class="comment">// ...and update the length to what was initialized.
</span>dict.set_len(dict_length);
<span class="prelude-val">Some</span>(dict)
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
}</code></pre></div>
<p>While the following example is sound, there is a memory leak since
the inner vectors were not freed prior to the <code>set_len</code> call:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">0</span>, <span class="number">0</span>],
<span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>],
<span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>]];
<span class="comment">// SAFETY:
// 1. `old_len..0` is empty so no elements need to be initialized.
// 2. `0 &lt;= capacity` always holds whatever `capacity` is.
</span><span class="kw">unsafe </span>{
vec.set_len(<span class="number">0</span>);
}</code></pre></div>
<p>Normally, here, one would use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.clear" title="method alloc::vec::Vec::clear"><code>clear</code></a> instead to correctly drop
the contents and thus not leak memory.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_remove" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1514">source</a></span><h4 class="code-header">pub fn <a href="#method.swap_remove" class="fn">swap_remove</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; T</h4></section></summary><div class="docblock"><p>Removes an element from the vector and returns it.</p>
<p>The removed element is replaced by the last element of the vector.</p>
<p>This does not preserve ordering of the remaining elements, but is <em>O</em>(1).
If you need to preserve the element order, use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.remove" title="method alloc::vec::Vec::remove"><code>remove</code></a> instead.</p>
<h5 id="panics-2"><a class="doc-anchor" href="#panics-2">§</a>Panics</h5>
<p>Panics if <code>index</code> is out of bounds.</p>
<h5 id="examples-14"><a class="doc-anchor" href="#examples-14">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"baz"</span>, <span class="string">"qux"</span>];
<span class="macro">assert_eq!</span>(v.swap_remove(<span class="number">1</span>), <span class="string">"bar"</span>);
<span class="macro">assert_eq!</span>(v, [<span class="string">"foo"</span>, <span class="string">"qux"</span>, <span class="string">"baz"</span>]);
<span class="macro">assert_eq!</span>(v.swap_remove(<span class="number">0</span>), <span class="string">"foo"</span>);
<span class="macro">assert_eq!</span>(v, [<span class="string">"baz"</span>, <span class="string">"qux"</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1562">source</a></span><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, element: T)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Inserts an element at position <code>index</code> within the vector, shifting all
elements after it to the right.</p>
<h5 id="panics-3"><a class="doc-anchor" href="#panics-3">§</a>Panics</h5>
<p>Panics if <code>index &gt; len</code>.</p>
<h5 id="examples-15"><a class="doc-anchor" href="#examples-15">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
vec.insert(<span class="number">1</span>, <span class="number">4</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>]);
vec.insert(<span class="number">4</span>, <span class="number">5</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>]);</code></pre></div>
<h5 id="time-complexity"><a class="doc-anchor" href="#time-complexity">§</a>Time complexity</h5>
<p>Takes <em>O</em>(<a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.len" title="method alloc::vec::Vec::len"><code>Vec::len</code></a>) time. All items after the insertion index must be
shifted to the right. In the worst case, all elements are shifted when
the insertion index is 0.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.remove" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1624">source</a></span><h4 class="code-header">pub fn <a href="#method.remove" class="fn">remove</a>(&amp;mut self, index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; T</h4></section></summary><div class="docblock"><p>Removes and returns the element at position <code>index</code> within the vector,
shifting all elements after it to the left.</p>
<p>Note: Because this shifts over the remaining elements, it has a
worst-case performance of <em>O</em>(<em>n</em>). If you don’t need the order of elements
to be preserved, use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.swap_remove" title="method alloc::vec::Vec::swap_remove"><code>swap_remove</code></a> instead. If you’d like to remove
elements from the beginning of the <code>Vec</code>, consider using
<a href="https://doc.rust-lang.org/nightly/alloc/collections/vec_deque/struct.VecDeque.html#method.pop_front" title="method alloc::collections::vec_deque::VecDeque::pop_front"><code>VecDeque::pop_front</code></a> instead.</p>
<h5 id="panics-4"><a class="doc-anchor" href="#panics-4">§</a>Panics</h5>
<p>Panics if <code>index</code> is out of bounds.</p>
<h5 id="examples-16"><a class="doc-anchor" href="#examples-16">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq!</span>(v.remove(<span class="number">1</span>), <span class="number">2</span>);
<span class="macro">assert_eq!</span>(v, [<span class="number">1</span>, <span class="number">3</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.retain" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1679-1681">source</a></span><h4 class="code-header">pub fn <a href="#method.retain" class="fn">retain</a>&lt;F&gt;(&amp;mut self, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Retains only the elements specified by the predicate.</p>
<p>In other words, remove all elements <code>e</code> for which <code>f(&amp;e)</code> returns <code>false</code>.
This method operates in place, visiting each element exactly once in the
original order, and preserves the order of the retained elements.</p>
<h5 id="examples-17"><a class="doc-anchor" href="#examples-17">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
vec.retain(|<span class="kw-2">&amp;</span>x| x % <span class="number">2 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">2</span>, <span class="number">4</span>]);</code></pre></div>
<p>Because the elements are visited exactly once in the original order,
external state may be used to decide which elements to keep.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
<span class="kw">let </span>keep = [<span class="bool-val">false</span>, <span class="bool-val">true</span>, <span class="bool-val">true</span>, <span class="bool-val">false</span>, <span class="bool-val">true</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = keep.iter();
vec.retain(|<span class="kw">_</span>| <span class="kw-2">*</span>iter.next().unwrap());
<span class="macro">assert_eq!</span>(vec, [<span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.retain_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.61.0">1.61.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1705-1707">source</a></span><h4 class="code-header">pub fn <a href="#method.retain_mut" class="fn">retain_mut</a>&lt;F&gt;(&amp;mut self, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Retains only the elements specified by the predicate, passing a mutable reference to it.</p>
<p>In other words, remove all elements <code>e</code> such that <code>f(&amp;mut e)</code> returns <code>false</code>.
This method operates in place, visiting each element exactly once in the
original order, and preserves the order of the retained elements.</p>
<h5 id="examples-18"><a class="doc-anchor" href="#examples-18">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
vec.retain_mut(|x| <span class="kw">if </span><span class="kw-2">*</span>x &lt;= <span class="number">3 </span>{
<span class="kw-2">*</span>x += <span class="number">1</span>;
<span class="bool-val">true
</span>} <span class="kw">else </span>{
<span class="bool-val">false
</span>});
<span class="macro">assert_eq!</span>(vec, [<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.dedup_by_key" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.16.0">1.16.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1814-1817">source</a></span><h4 class="code-header">pub fn <a href="#method.dedup_by_key" class="fn">dedup_by_key</a>&lt;F, K&gt;(&amp;mut self, key: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section></summary><div class="docblock"><p>Removes all but the first of consecutive elements in the vector that resolve to the same
key.</p>
<p>If the vector is sorted, this removes all duplicates.</p>
<h5 id="examples-19"><a class="doc-anchor" href="#examples-19">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">10</span>, <span class="number">20</span>, <span class="number">21</span>, <span class="number">30</span>, <span class="number">20</span>];
vec.dedup_by_key(|i| <span class="kw-2">*</span>i / <span class="number">10</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">10</span>, <span class="number">20</span>, <span class="number">30</span>, <span class="number">20</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.dedup_by" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.16.0">1.16.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1841-1843">source</a></span><h4 class="code-header">pub fn <a href="#method.dedup_by" class="fn">dedup_by</a>&lt;F&gt;(&amp;mut self, same_bucket: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Removes all but the first of consecutive elements in the vector satisfying a given equality
relation.</p>
<p>The <code>same_bucket</code> function is passed references to two elements from the vector and
must determine if the elements compare equal. The elements are passed in opposite order
from their order in the slice, so if <code>same_bucket(a, b)</code> returns <code>true</code>, <code>a</code> is removed.</p>
<p>If the vector is sorted, this removes all duplicates.</p>
<h5 id="examples-20"><a class="doc-anchor" href="#examples-20">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"Bar"</span>, <span class="string">"baz"</span>, <span class="string">"bar"</span>];
vec.dedup_by(|a, b| a.eq_ignore_ascii_case(b));
<span class="macro">assert_eq!</span>(vec, [<span class="string">"foo"</span>, <span class="string">"bar"</span>, <span class="string">"baz"</span>, <span class="string">"bar"</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.push" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#1993">source</a></span><h4 class="code-header">pub fn <a href="#method.push" class="fn">push</a>(&amp;mut self, value: T)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Appends an element to the back of a collection.</p>
<h5 id="panics-5"><a class="doc-anchor" href="#panics-5">§</a>Panics</h5>
<p>Panics if the new capacity exceeds <code>isize::MAX</code> <em>bytes</em>.</p>
<h5 id="examples-21"><a class="doc-anchor" href="#examples-21">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>];
vec.push(<span class="number">3</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
<h5 id="time-complexity-1"><a class="doc-anchor" href="#time-complexity-1">§</a>Time complexity</h5>
<p>Takes amortized <em>O</em>(1) time. If the vector’s length would exceed its
capacity after the push, <em>O</em>(<em>capacity</em>) time is taken to copy the
vector’s elements to a larger allocation. This expensive operation is
offset by the <em>capacity</em> <em>O</em>(1) insertions it allows.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.push_within_capacity" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2045">source</a><h4 class="code-header">pub fn <a href="#method.push_within_capacity" class="fn">push_within_capacity</a>(&amp;mut self, value: T) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, T&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>vec_push_within_capacity</code>)</span></div></span></summary><div class="docblock"><p>Appends an element if there is sufficient spare capacity, otherwise an error is returned
with the element.</p>
<p>Unlike <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.push" title="method alloc::vec::Vec::push"><code>push</code></a> this method will not reallocate when there’s insufficient capacity.
The caller should use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.reserve" title="method alloc::vec::Vec::reserve"><code>reserve</code></a> or <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.try_reserve" title="method alloc::vec::Vec::try_reserve"><code>try_reserve</code></a> to ensure that there is enough capacity.</p>
<h5 id="examples-22"><a class="doc-anchor" href="#examples-22">§</a>Examples</h5>
<p>A manual, panic-free alternative to <a href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.FromIterator.html" title="trait core::iter::traits::collect::FromIterator"><code>FromIterator</code></a>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(vec_push_within_capacity)]
</span><span class="kw">use </span>std::collections::TryReserveError;
<span class="kw">fn </span>from_iter_fallible&lt;T&gt;(iter: <span class="kw">impl </span>Iterator&lt;Item=T&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;T&gt;, TryReserveError&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::new();
<span class="kw">for </span>value <span class="kw">in </span>iter {
<span class="kw">if let </span><span class="prelude-val">Err</span>(value) = vec.push_within_capacity(value) {
vec.try_reserve(<span class="number">1</span>)<span class="question-mark">?</span>;
<span class="comment">// this cannot fail, the previous line either returned or added at least 1 free slot
</span><span class="kw">let _ </span>= vec.push_within_capacity(value);
}
}
<span class="prelude-val">Ok</span>(vec)
}
<span class="macro">assert_eq!</span>(from_iter_fallible(<span class="number">0</span>..<span class="number">100</span>), <span class="prelude-val">Ok</span>(Vec::from_iter(<span class="number">0</span>..<span class="number">100</span>)));</code></pre></div>
<h5 id="time-complexity-2"><a class="doc-anchor" href="#time-complexity-2">§</a>Time complexity</h5>
<p>Takes <em>O</em>(1) time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.pop" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2078">source</a></span><h4 class="code-header">pub fn <a href="#method.pop" class="fn">pop</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;</h4></section></summary><div class="docblock"><p>Removes the last element from a vector and returns it, or <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.None" title="variant core::option::Option::None"><code>None</code></a> if it
is empty.</p>
<p>If you’d like to pop the first element, consider using
<a href="https://doc.rust-lang.org/nightly/alloc/collections/vec_deque/struct.VecDeque.html#method.pop_front" title="method alloc::collections::vec_deque::VecDeque::pop_front"><code>VecDeque::pop_front</code></a> instead.</p>
<h5 id="examples-23"><a class="doc-anchor" href="#examples-23">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq!</span>(vec.pop(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>]);</code></pre></div>
<h5 id="time-complexity-3"><a class="doc-anchor" href="#time-complexity-3">§</a>Time complexity</h5>
<p>Takes <em>O</em>(1) time.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.pop_if" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2107-2109">source</a><h4 class="code-header">pub fn <a href="#method.pop_if" class="fn">pop_if</a>&lt;F&gt;(&amp;mut self, f: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>vec_pop_if</code>)</span></div></span></summary><div class="docblock"><p>Removes and returns the last element in a vector if the predicate
returns <code>true</code>, or <a href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html#variant.None" title="variant core::option::Option::None"><code>None</code></a> if the predicate returns false or the vector
is empty.</p>
<h5 id="examples-24"><a class="doc-anchor" href="#examples-24">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(vec_pop_if)]
</span><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let </span>pred = |x: <span class="kw-2">&amp;mut </span>i32| <span class="kw-2">*</span>x % <span class="number">2 </span>== <span class="number">0</span>;
<span class="macro">assert_eq!</span>(vec.pop_if(pred), <span class="prelude-val">Some</span>(<span class="number">4</span>));
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="macro">assert_eq!</span>(vec.pop_if(pred), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.append" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.4.0">1.4.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2133">source</a></span><h4 class="code-header">pub fn <a href="#method.append" class="fn">append</a>(&amp;mut self, other: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T, A&gt;)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Moves all the elements of <code>other</code> into <code>self</code>, leaving <code>other</code> empty.</p>
<h5 id="panics-6"><a class="doc-anchor" href="#panics-6">§</a>Panics</h5>
<p>Panics if the new capacity exceeds <code>isize::MAX</code> <em>bytes</em>.</p>
<h5 id="examples-25"><a class="doc-anchor" href="#examples-25">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let </span><span class="kw-2">mut </span>vec2 = <span class="macro">vec!</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>];
vec.append(<span class="kw-2">&amp;mut </span>vec2);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
<span class="macro">assert_eq!</span>(vec2, []);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.drain" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.6.0">1.6.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2182-2184">source</a></span><h4 class="code-header">pub fn <a href="#method.drain" class="fn">drain</a>&lt;R&gt;(&amp;mut self, range: R) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/drain/struct.Drain.html" title="struct alloc::vec::drain::Drain">Drain</a>&lt;'_, T, A&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/range/trait.RangeBounds.html" title="trait core::ops::range::RangeBounds">RangeBounds</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,</div></h4></section></summary><div class="docblock"><p>Removes the specified range from the vector in bulk, returning all
removed elements as an iterator. If the iterator is dropped before
being fully consumed, it drops the remaining removed elements.</p>
<p>The returned iterator keeps a mutable borrow on the vector to optimize
its implementation.</p>
<h5 id="panics-7"><a class="doc-anchor" href="#panics-7">§</a>Panics</h5>
<p>Panics if the starting point is greater than the end point or if
the end point is greater than the length of the vector.</p>
<h5 id="leaking"><a class="doc-anchor" href="#leaking">§</a>Leaking</h5>
<p>If the returned iterator goes out of scope without being dropped (due to
<a href="https://doc.rust-lang.org/nightly/core/mem/fn.forget.html" title="fn core::mem::forget"><code>mem::forget</code></a>, for example), the vector may have lost and leaked
elements arbitrarily, including elements outside the range.</p>
<h5 id="examples-26"><a class="doc-anchor" href="#examples-26">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let </span>u: Vec&lt;<span class="kw">_</span>&gt; = v.drain(<span class="number">1</span>..).collect();
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">1</span>]);
<span class="macro">assert_eq!</span>(u, <span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">3</span>]);
<span class="comment">// A full range clears the vector, like `clear()` does
</span>v.drain(..);
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.clear" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2228">source</a></span><h4 class="code-header">pub fn <a href="#method.clear" class="fn">clear</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Clears the vector, removing all values.</p>
<p>Note that this method has no effect on the allocated capacity
of the vector.</p>
<h5 id="examples-27"><a class="doc-anchor" href="#examples-27">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
v.clear();
<span class="macro">assert!</span>(v.is_empty());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.len" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2255">source</a></span><h4 class="code-header">pub fn <a href="#method.len" class="fn">len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of elements in the vector, also referred to
as its ‘length’.</p>
<h5 id="examples-28"><a class="doc-anchor" href="#examples-28">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>a = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq!</span>(a.len(), <span class="number">3</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_empty" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2271">source</a></span><h4 class="code-header">pub fn <a href="#method.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the vector contains no elements.</p>
<h5 id="examples-29"><a class="doc-anchor" href="#examples-29">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = Vec::new();
<span class="macro">assert!</span>(v.is_empty());
v.push(<span class="number">1</span>);
<span class="macro">assert!</span>(!v.is_empty());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_off" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.4.0">1.4.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2303-2305">source</a></span><h4 class="code-header">pub fn <a href="#method.split_off" class="fn">split_off</a>(&amp;mut self, at: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T, A&gt;<div class="where">where
A: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Splits the collection into two at the given index.</p>
<p>Returns a newly allocated vector containing the elements in the range
<code>[at, len)</code>. After the call, the original vector will be left containing
the elements <code>[0, at)</code> with its previous capacity unchanged.</p>
<ul>
<li>If you want to take ownership of the entire contents and capacity of
the vector, see <a href="https://doc.rust-lang.org/nightly/core/mem/fn.take.html" title="fn core::mem::take"><code>mem::take</code></a> or <a href="https://doc.rust-lang.org/nightly/core/mem/fn.replace.html" title="fn core::mem::replace"><code>mem::replace</code></a>.</li>
<li>If you don’t need the returned vector at all, see <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.truncate" title="method alloc::vec::Vec::truncate"><code>Vec::truncate</code></a>.</li>
<li>If you want to take ownership of an arbitrary subslice, or you don’t
necessarily want to store the removed items in a vector, see <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.drain" title="method alloc::vec::Vec::drain"><code>Vec::drain</code></a>.</li>
</ul>
<h5 id="panics-8"><a class="doc-anchor" href="#panics-8">§</a>Panics</h5>
<p>Panics if <code>at &gt; len</code>.</p>
<h5 id="examples-30"><a class="doc-anchor" href="#examples-30">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let </span>vec2 = vec.split_off(<span class="number">1</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>]);
<span class="macro">assert_eq!</span>(vec2, [<span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.resize_with" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.33.0">1.33.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2359-2361">source</a></span><h4 class="code-header">pub fn <a href="#method.resize_with" class="fn">resize_with</a>&lt;F&gt;(&amp;mut self, new_len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>() -&gt; T,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Resizes the <code>Vec</code> in-place so that <code>len</code> is equal to <code>new_len</code>.</p>
<p>If <code>new_len</code> is greater than <code>len</code>, the <code>Vec</code> is extended by the
difference, with each additional slot filled with the result of
calling the closure <code>f</code>. The return values from <code>f</code> will end up
in the <code>Vec</code> in the order they have been generated.</p>
<p>If <code>new_len</code> is less than <code>len</code>, the <code>Vec</code> is simply truncated.</p>
<p>This method uses a closure to create new values on every push. If
you’d rather <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone"><code>Clone</code></a> a given value, use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.resize" title="method alloc::vec::Vec::resize"><code>Vec::resize</code></a>. If you
want to use the <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default"><code>Default</code></a> trait to generate values, you can
pass <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default" title="associated function core::default::Default::default"><code>Default::default</code></a> as the second argument.</p>
<h5 id="examples-31"><a class="doc-anchor" href="#examples-31">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
vec.resize_with(<span class="number">5</span>, Default::default);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>]);
<span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[];
<span class="kw">let </span><span class="kw-2">mut </span>p = <span class="number">1</span>;
vec.resize_with(<span class="number">4</span>, || { p <span class="kw-2">*</span>= <span class="number">2</span>; p });
<span class="macro">assert_eq!</span>(vec, [<span class="number">2</span>, <span class="number">4</span>, <span class="number">8</span>, <span class="number">16</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.spare_capacity_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.60.0">1.60.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2434">source</a></span><h4 class="code-header">pub fn <a href="#method.spare_capacity_mut" class="fn">spare_capacity_mut</a>(&amp;mut self) -&gt; &amp;mut [<a class="union" href="https://doc.rust-lang.org/nightly/core/mem/maybe_uninit/union.MaybeUninit.html" title="union core::mem::maybe_uninit::MaybeUninit">MaybeUninit</a>&lt;T&gt;]</h4></section></summary><div class="docblock"><p>Returns the remaining spare capacity of the vector as a slice of
<code>MaybeUninit&lt;T&gt;</code>.</p>
<p>The returned slice can be used to fill the vector with data (e.g. by
reading from a file) before marking the data as initialized using the
<a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.set_len" title="method alloc::vec::Vec::set_len"><code>set_len</code></a> method.</p>
<h5 id="examples-32"><a class="doc-anchor" href="#examples-32">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// Allocate vector big enough for 10 elements.
</span><span class="kw">let </span><span class="kw-2">mut </span>v = Vec::with_capacity(<span class="number">10</span>);
<span class="comment">// Fill in the first 3 elements.
</span><span class="kw">let </span>uninit = v.spare_capacity_mut();
uninit[<span class="number">0</span>].write(<span class="number">0</span>);
uninit[<span class="number">1</span>].write(<span class="number">1</span>);
uninit[<span class="number">2</span>].write(<span class="number">2</span>);
<span class="comment">// Mark the first 3 elements of the vector as being initialized.
</span><span class="kw">unsafe </span>{
v.set_len(<span class="number">3</span>);
}
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>v, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at_spare_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2499">source</a><h4 class="code-header">pub fn <a href="#method.split_at_spare_mut" class="fn">split_at_spare_mut</a>(&amp;mut self) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut [<a class="union" href="https://doc.rust-lang.org/nightly/core/mem/maybe_uninit/union.MaybeUninit.html" title="union core::mem::maybe_uninit::MaybeUninit">MaybeUninit</a>&lt;T&gt;])</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>vec_split_at_spare</code>)</span></div></span></summary><div class="docblock"><p>Returns vector content as a slice of <code>T</code>, along with the remaining spare
capacity of the vector as a slice of <code>MaybeUninit&lt;T&gt;</code>.</p>
<p>The returned spare capacity slice can be used to fill the vector with data
(e.g. by reading from a file) before marking the data as initialized using
the <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.set_len" title="method alloc::vec::Vec::set_len"><code>set_len</code></a> method.</p>
<p>Note that this is a low-level API, which should be used with care for
optimization purposes. If you need to append data to a <code>Vec</code>
you can use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.push" title="method alloc::vec::Vec::push"><code>push</code></a>, <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.extend" title="method alloc::vec::Vec::extend"><code>extend</code></a>, <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.extend_from_slice" title="method alloc::vec::Vec::extend_from_slice"><code>extend_from_slice</code></a>,
<a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.extend_from_within" title="method alloc::vec::Vec::extend_from_within"><code>extend_from_within</code></a>, <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.insert" title="method alloc::vec::Vec::insert"><code>insert</code></a>, <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.append" title="method alloc::vec::Vec::append"><code>append</code></a>, <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.resize" title="method alloc::vec::Vec::resize"><code>resize</code></a> or
<a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.resize_with" title="method alloc::vec::Vec::resize_with"><code>resize_with</code></a>, depending on your exact needs.</p>
<h5 id="examples-33"><a class="doc-anchor" href="#examples-33">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(vec_split_at_spare)]
</span><span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="comment">// Reserve additional space big enough for 10 elements.
</span>v.reserve(<span class="number">10</span>);
<span class="kw">let </span>(init, uninit) = v.split_at_spare_mut();
<span class="kw">let </span>sum = init.iter().copied().sum::&lt;u32&gt;();
<span class="comment">// Fill in the next 4 elements.
</span>uninit[<span class="number">0</span>].write(sum);
uninit[<span class="number">1</span>].write(sum * <span class="number">2</span>);
uninit[<span class="number">2</span>].write(sum * <span class="number">3</span>);
uninit[<span class="number">3</span>].write(sum * <span class="number">4</span>);
<span class="comment">// Mark the 4 elements of the vector as being initialized.
</span><span class="kw">unsafe </span>{
<span class="kw">let </span>len = v.len();
v.set_len(len + <span class="number">4</span>);
}
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>v, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>, <span class="number">8</span>, <span class="number">12</span>, <span class="number">16</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.resize" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2559">source</a></span><h4 class="code-header">pub fn <a href="#method.resize" class="fn">resize</a>(&amp;mut self, new_len: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, value: T)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Resizes the <code>Vec</code> in-place so that <code>len</code> is equal to <code>new_len</code>.</p>
<p>If <code>new_len</code> is greater than <code>len</code>, the <code>Vec</code> is extended by the
difference, with each additional slot filled with <code>value</code>.
If <code>new_len</code> is less than <code>len</code>, the <code>Vec</code> is simply truncated.</p>
<p>This method requires <code>T</code> to implement <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone"><code>Clone</code></a>,
in order to be able to clone the passed value.
If you need more flexibility (or want to rely on <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default"><code>Default</code></a> instead of
<a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone"><code>Clone</code></a>), use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.resize_with" title="method alloc::vec::Vec::resize_with"><code>Vec::resize_with</code></a>.
If you only need to resize to a smaller size, use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.truncate" title="method alloc::vec::Vec::truncate"><code>Vec::truncate</code></a>.</p>
<h5 id="examples-34"><a class="doc-anchor" href="#examples-34">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="string">"hello"</span>];
vec.resize(<span class="number">3</span>, <span class="string">"world"</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="string">"hello"</span>, <span class="string">"world"</span>, <span class="string">"world"</span>]);
<span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
vec.resize(<span class="number">2</span>, <span class="number">0</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_from_slice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.6.0">1.6.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2590">source</a></span><h4 class="code-header">pub fn <a href="#method.extend_from_slice" class="fn">extend_from_slice</a>(&amp;mut self, other: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Clones and appends all elements in a slice to the <code>Vec</code>.</p>
<p>Iterates over the slice <code>other</code>, clones each element, and then appends
it to this <code>Vec</code>. The <code>other</code> slice is traversed in-order.</p>
<p>Note that this function is same as <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.extend" title="method alloc::vec::Vec::extend"><code>extend</code></a> except that it is
specialized to work with slices instead. If and when Rust gets
specialization this function will likely be deprecated (but still
available).</p>
<h5 id="examples-35"><a class="doc-anchor" href="#examples-35">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>];
vec.extend_from_slice(<span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_from_within" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.53.0">1.53.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2617-2619">source</a></span><h4 class="code-header">pub fn <a href="#method.extend_from_within" class="fn">extend_from_within</a>&lt;R&gt;(&amp;mut self, src: R)<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/range/trait.RangeBounds.html" title="trait core::ops::range::RangeBounds">RangeBounds</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Copies elements from <code>src</code> range to the end of the vector.</p>
<h5 id="panics-9"><a class="doc-anchor" href="#panics-9">§</a>Panics</h5>
<p>Panics if the starting point is greater than the end point or if
the end point is greater than the length of the vector.</p>
<h5 id="examples-36"><a class="doc-anchor" href="#examples-36">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
vec.extend_from_within(<span class="number">2</span>..);
<span class="macro">assert_eq!</span>(vec, [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
vec.extend_from_within(..<span class="number">2</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">0</span>, <span class="number">1</span>]);
vec.extend_from_within(<span class="number">4</span>..<span class="number">8</span>);
<span class="macro">assert_eq!</span>(vec, [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">4</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.dedup" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#2724">source</a></span><h4 class="code-header">pub fn <a href="#method.dedup" class="fn">dedup</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Removes consecutive repeated elements in the vector according to the
<a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq"><code>PartialEq</code></a> trait implementation.</p>
<p>If the vector is sorted, this removes all duplicates.</p>
<h5 id="examples-37"><a class="doc-anchor" href="#examples-37">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>vec = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>];
vec.dedup();
<span class="macro">assert_eq!</span>(vec, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.splice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.21.0">1.21.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#3150-3153">source</a></span><h4 class="code-header">pub fn <a href="#method.splice" class="fn">splice</a>&lt;R, I&gt;(
&amp;mut self,
range: R,
replace_with: I
) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/splice/struct.Splice.html" title="struct alloc::vec::splice::Splice">Splice</a>&lt;'_, &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::collect::IntoIterator::IntoIter">IntoIter</a>, A&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/range/trait.RangeBounds.html" title="trait core::ops::range::RangeBounds">RangeBounds</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,
I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Creates a splicing iterator that replaces the specified range in the vector
with the given <code>replace_with</code> iterator and yields the removed items.
<code>replace_with</code> does not need to be the same length as <code>range</code>.</p>
<p><code>range</code> is removed even if the iterator is not consumed until the end.</p>
<p>It is unspecified how many elements are removed from the vector
if the <code>Splice</code> value is leaked.</p>
<p>The input iterator <code>replace_with</code> is only consumed when the <code>Splice</code> value is dropped.</p>
<p>This is optimal if:</p>
<ul>
<li>The tail (elements in the vector after <code>range</code>) is empty,</li>
<li>or <code>replace_with</code> yields fewer or equal elements than <code>range</code>’s length</li>
<li>or the lower bound of its <code>size_hint()</code> is exact.</li>
</ul>
<p>Otherwise, a temporary vector is allocated and the tail is moved twice.</p>
<h5 id="panics-10"><a class="doc-anchor" href="#panics-10">§</a>Panics</h5>
<p>Panics if the starting point is greater than the end point or if
the end point is greater than the length of the vector.</p>
<h5 id="examples-38"><a class="doc-anchor" href="#examples-38">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let </span>new = [<span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>];
<span class="kw">let </span>u: Vec&lt;<span class="kw">_</span>&gt; = v.splice(<span class="number">1</span>..<span class="number">3</span>, new).collect();
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(u, <span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.extract_if" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/vec/mod.rs.html#3209-3211">source</a><h4 class="code-header">pub fn <a href="#method.extract_if" class="fn">extract_if</a>&lt;F&gt;(&amp;mut self, filter: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/extract_if/struct.ExtractIf.html" title="struct alloc::vec::extract_if::ExtractIf">ExtractIf</a>&lt;'_, T, F, A&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extract_if</code>)</span></div></span></summary><div class="docblock"><p>Creates an iterator which uses a closure to determine if an element should be removed.</p>
<p>If the closure returns true, then the element is removed and yielded.
If the closure returns false, the element will remain in the vector and will not be yielded
by the iterator.</p>
<p>If the returned <code>ExtractIf</code> is not exhausted, e.g. because it is dropped without iterating
or the iteration short-circuits, then the remaining elements will be retained.
Use <a href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html#method.retain" title="method alloc::vec::Vec::retain"><code>retain</code></a> with a negated predicate if you do not need the returned iterator.</p>
<p>Using this method is equivalent to the following code:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>;
<span class="kw">while </span>i &lt; vec.len() {
<span class="kw">if </span>some_predicate(<span class="kw-2">&amp;mut </span>vec[i]) {
<span class="kw">let </span>val = vec.remove(i);
<span class="comment">// your code here
</span>} <span class="kw">else </span>{
i += <span class="number">1</span>;
}
}
</code></pre></div>
<p>But <code>extract_if</code> is easier to use. <code>extract_if</code> is also more efficient,
because it can backshift the elements of the array in bulk.</p>
<p>Note that <code>extract_if</code> also lets you mutate every element in the filter closure,
regardless of whether you choose to keep or remove it.</p>
<h5 id="examples-39"><a class="doc-anchor" href="#examples-39">§</a>Examples</h5>
<p>Splitting an array into evens and odds, reusing the original allocation:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(extract_if)]
</span><span class="kw">let </span><span class="kw-2">mut </span>numbers = <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">11</span>, <span class="number">13</span>, <span class="number">14</span>, <span class="number">15</span>];
<span class="kw">let </span>evens = numbers.extract_if(|x| <span class="kw-2">*</span>x % <span class="number">2 </span>== <span class="number">0</span>).collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;();
<span class="kw">let </span>odds = numbers;
<span class="macro">assert_eq!</span>(evens, <span class="macro">vec!</span>[<span class="number">2</span>, <span class="number">4</span>, <span class="number">6</span>, <span class="number">8</span>, <span class="number">14</span>]);
<span class="macro">assert_eq!</span>(odds, <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">9</span>, <span class="number">11</span>, <span class="number">13</span>, <span class="number">15</span>]);</code></pre></div>
</div></details></div><h2 id="deref-methods-%5BT%5D" class="section-header"><span>Methods from <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a>&lt;Target = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;</span><a href="#deref-methods-%5BT%5D" class="anchor">§</a></h2><div id="deref-methods-%5BT%5D-1" class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.as_flattened" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4549">source</a></span><h4 class="code-header">pub fn <a href="#method.as_flattened" class="fn">as_flattened</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a></h4></section></summary><div class="docblock"><p>Takes a <code>&amp;[[T; N]]</code>, and flattens it to a <code>&amp;[T]</code>.</p>
<h5 id="panics-11"><a class="doc-anchor" href="#panics-11">§</a>Panics</h5>
<p>This panics if the length of the resulting slice would overflow a <code>usize</code>.</p>
<p>This is only possible when flattening a slice of arrays of zero-sized
types, and thus tends to be irrelevant in practice. If
<code>size_of::&lt;T&gt;() &gt; 0</code>, this will never panic.</p>
<h5 id="examples-40"><a class="doc-anchor" href="#examples-40">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>([[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], [<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]].as_flattened(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
<span class="macro">assert_eq!</span>(
[[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], [<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]].as_flattened(),
[[<span class="number">1</span>, <span class="number">2</span>], [<span class="number">3</span>, <span class="number">4</span>], [<span class="number">5</span>, <span class="number">6</span>]].as_flattened(),
);
<span class="kw">let </span>slice_of_empty_arrays: <span class="kw-2">&amp;</span>[[i32; <span class="number">0</span>]] = <span class="kw-2">&amp;</span>[[], [], [], [], []];
<span class="macro">assert!</span>(slice_of_empty_arrays.as_flattened().is_empty());
<span class="kw">let </span>empty_slice_of_arrays: <span class="kw-2">&amp;</span>[[u32; <span class="number">10</span>]] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert!</span>(empty_slice_of_arrays.as_flattened().is_empty());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_flattened_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4585">source</a></span><h4 class="code-header">pub fn <a href="#method.as_flattened_mut" class="fn">as_flattened_mut</a>(&amp;mut self) -&gt; &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a></h4></section></summary><div class="docblock"><p>Takes a <code>&amp;mut [[T; N]]</code>, and flattens it to a <code>&amp;mut [T]</code>.</p>
<h5 id="panics-12"><a class="doc-anchor" href="#panics-12">§</a>Panics</h5>
<p>This panics if the length of the resulting slice would overflow a <code>usize</code>.</p>
<p>This is only possible when flattening a slice of arrays of zero-sized
types, and thus tends to be irrelevant in practice. If
<code>size_of::&lt;T&gt;() &gt; 0</code>, this will never panic.</p>
<h5 id="examples-41"><a class="doc-anchor" href="#examples-41">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">fn </span>add_5_to_all(slice: <span class="kw-2">&amp;mut </span>[i32]) {
<span class="kw">for </span>i <span class="kw">in </span>slice {
<span class="kw-2">*</span>i += <span class="number">5</span>;
}
}
<span class="kw">let </span><span class="kw-2">mut </span>array = [[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>], [<span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>], [<span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>]];
add_5_to_all(array.as_flattened_mut());
<span class="macro">assert_eq!</span>(array, [[<span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>], [<span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>], [<span class="number">12</span>, <span class="number">13</span>, <span class="number">14</span>]]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_floats" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4622">source</a><h4 class="code-header">pub fn <a href="#method.sort_floats" class="fn">sort_floats</a>(&amp;mut self)</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>sort_floats</code>)</span></div></span></summary><div class="docblock"><p>Sorts the slice of floats.</p>
<p>This sort is in-place (i.e. does not allocate), <em>O</em>(<em>n</em> * log(<em>n</em>)) worst-case, and uses
the ordering defined by <a href="https://doc.rust-lang.org/nightly/std/primitive.f32.html#method.total_cmp" title="method f32::total_cmp"><code>f32::total_cmp</code></a>.</p>
<h5 id="current-implementation"><a class="doc-anchor" href="#current-implementation">§</a>Current implementation</h5>
<p>This uses the same sorting algorithm as <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable_by" title="method slice::sort_unstable_by"><code>sort_unstable_by</code></a>.</p>
<h5 id="examples-42"><a class="doc-anchor" href="#examples-42">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(sort_floats)]
</span><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">2.6</span>, -<span class="number">5e-8</span>, f32::NAN, <span class="number">8.29</span>, f32::INFINITY, -<span class="number">1.0</span>, <span class="number">0.0</span>, -f32::INFINITY, -<span class="number">0.0</span>];
v.sort_floats();
<span class="kw">let </span>sorted = [-f32::INFINITY, -<span class="number">1.0</span>, -<span class="number">5e-8</span>, -<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">2.6</span>, <span class="number">8.29</span>, f32::INFINITY, f32::NAN];
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>v[..<span class="number">8</span>], <span class="kw-2">&amp;</span>sorted[..<span class="number">8</span>]);
<span class="macro">assert!</span>(v[<span class="number">8</span>].is_nan());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.len-1" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#138">source</a></span><h4 class="code-header">pub fn <a href="#method.len-1" class="fn">len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of elements in the slice.</p>
<h5 id="examples-43"><a class="doc-anchor" href="#examples-43">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>a = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert_eq!</span>(a.len(), <span class="number">3</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_empty-1" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#157">source</a></span><h4 class="code-header">pub fn <a href="#method.is_empty-1" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the slice has a length of 0.</p>
<h5 id="examples-44"><a class="doc-anchor" href="#examples-44">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>a = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="macro">assert!</span>(!a.is_empty());
<span class="kw">let </span>b: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert!</span>(b.is_empty());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.first" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#176">source</a></span><h4 class="code-header">pub fn <a href="#method.first" class="fn">first</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the first element of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-45"><a class="doc-anchor" href="#examples-45">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">10</span>), v.first());
<span class="kw">let </span>w: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, w.first());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.first_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#199">source</a></span><h4 class="code-header">pub fn <a href="#method.first_mut" class="fn">first_mut</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>&gt;</h4></section></summary><div class="docblock"><p>Returns a mutable pointer to the first element of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-46"><a class="doc-anchor" href="#examples-46">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>(first) = x.first_mut() {
<span class="kw-2">*</span>first = <span class="number">5</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">5</span>, <span class="number">1</span>, <span class="number">2</span>]);
<span class="kw">let </span>y: <span class="kw-2">&amp;mut </span>[i32] = <span class="kw-2">&amp;mut </span>[];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, y.first_mut());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_first" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#219">source</a></span><h4 class="code-header">pub fn <a href="#method.split_first" class="fn">split_first</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Returns the first and all the rest of the elements of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-47"><a class="doc-anchor" href="#examples-47">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((first, elements)) = x.split_first() {
<span class="macro">assert_eq!</span>(first, <span class="kw-2">&amp;</span><span class="number">0</span>);
<span class="macro">assert_eq!</span>(elements, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>]);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_first_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#241">source</a></span><h4 class="code-header">pub fn <a href="#method.split_first_mut" class="fn">split_first_mut</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Returns the first and all the rest of the elements of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-48"><a class="doc-anchor" href="#examples-48">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((first, elements)) = x.split_first_mut() {
<span class="kw-2">*</span>first = <span class="number">3</span>;
elements[<span class="number">0</span>] = <span class="number">4</span>;
elements[<span class="number">1</span>] = <span class="number">5</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_last" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#261">source</a></span><h4 class="code-header">pub fn <a href="#method.split_last" class="fn">split_last</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Returns the last and all the rest of the elements of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-49"><a class="doc-anchor" href="#examples-49">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((last, elements)) = x.split_last() {
<span class="macro">assert_eq!</span>(last, <span class="kw-2">&amp;</span><span class="number">2</span>);
<span class="macro">assert_eq!</span>(elements, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>]);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_last_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.5.0">1.5.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#283">source</a></span><h4 class="code-header">pub fn <a href="#method.split_last_mut" class="fn">split_last_mut</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Returns the last and all the rest of the elements of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-50"><a class="doc-anchor" href="#examples-50">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((last, elements)) = x.split_last_mut() {
<span class="kw-2">*</span>last = <span class="number">3</span>;
elements[<span class="number">0</span>] = <span class="number">4</span>;
elements[<span class="number">1</span>] = <span class="number">5</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">4</span>, <span class="number">5</span>, <span class="number">3</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.last" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#302">source</a></span><h4 class="code-header">pub fn <a href="#method.last" class="fn">last</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the last element of the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-51"><a class="doc-anchor" href="#examples-51">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">30</span>), v.last());
<span class="kw">let </span>w: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, w.last());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.last_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#325">source</a></span><h4 class="code-header">pub fn <a href="#method.last_mut" class="fn">last_mut</a>(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>&gt;</h4></section></summary><div class="docblock"><p>Returns a mutable reference to the last item in the slice, or <code>None</code> if it is empty.</p>
<h5 id="examples-52"><a class="doc-anchor" href="#examples-52">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>(last) = x.last_mut() {
<span class="kw-2">*</span>last = <span class="number">10</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">10</span>]);
<span class="kw">let </span>y: <span class="kw-2">&amp;mut </span>[i32] = <span class="kw-2">&amp;mut </span>[];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, y.last_mut());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.first_chunk" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#348">source</a></span><h4 class="code-header">pub fn <a href="#method.first_chunk" class="fn">first_chunk</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>&gt;</h4></section></summary><div class="docblock"><p>Return an array reference to the first <code>N</code> items in the slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-53"><a class="doc-anchor" href="#examples-53">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>u = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>]), u.first_chunk::&lt;<span class="number">2</span>&gt;());
<span class="kw">let </span>v: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[<span class="number">10</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, v.first_chunk::&lt;<span class="number">2</span>&gt;());
<span class="kw">let </span>w: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[]), w.first_chunk::&lt;<span class="number">0</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.first_chunk_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#378">source</a></span><h4 class="code-header">pub fn <a href="#method.first_chunk_mut" class="fn">first_chunk_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>&gt;</h4></section></summary><div class="docblock"><p>Return a mutable array reference to the first <code>N</code> items in the slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-54"><a class="doc-anchor" href="#examples-54">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>(first) = x.first_chunk_mut::&lt;<span class="number">2</span>&gt;() {
first[<span class="number">0</span>] = <span class="number">5</span>;
first[<span class="number">1</span>] = <span class="number">4</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">5</span>, <span class="number">4</span>, <span class="number">2</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, x.first_chunk_mut::&lt;<span class="number">4</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_first_chunk" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#408">source</a></span><h4 class="code-header">pub fn <a href="#method.split_first_chunk" class="fn">split_first_chunk</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Return an array reference to the first <code>N</code> items in the slice and the remaining slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-55"><a class="doc-anchor" href="#examples-55">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((first, elements)) = x.split_first_chunk::&lt;<span class="number">2</span>&gt;() {
<span class="macro">assert_eq!</span>(first, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq!</span>(elements, <span class="kw-2">&amp;</span>[<span class="number">2</span>]);
}
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, x.split_first_chunk::&lt;<span class="number">4</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_first_chunk_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#443-445">source</a></span><h4 class="code-header">pub fn <a href="#method.split_first_chunk_mut" class="fn">split_first_chunk_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(
&amp;mut self
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Return a mutable array reference to the first <code>N</code> items in the slice and the remaining
slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-56"><a class="doc-anchor" href="#examples-56">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((first, elements)) = x.split_first_chunk_mut::&lt;<span class="number">2</span>&gt;() {
first[<span class="number">0</span>] = <span class="number">3</span>;
first[<span class="number">1</span>] = <span class="number">4</span>;
elements[<span class="number">0</span>] = <span class="number">5</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, x.split_first_chunk_mut::&lt;<span class="number">4</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_last_chunk" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#478">source</a></span><h4 class="code-header">pub fn <a href="#method.split_last_chunk" class="fn">split_last_chunk</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>)&gt;</h4></section></summary><div class="docblock"><p>Return an array reference to the last <code>N</code> items in the slice and the remaining slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-57"><a class="doc-anchor" href="#examples-57">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((elements, last)) = x.split_last_chunk::&lt;<span class="number">2</span>&gt;() {
<span class="macro">assert_eq!</span>(elements, <span class="kw-2">&amp;</span>[<span class="number">0</span>]);
<span class="macro">assert_eq!</span>(last, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>]);
}
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, x.split_last_chunk::&lt;<span class="number">4</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_last_chunk_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#513-515">source</a></span><h4 class="code-header">pub fn <a href="#method.split_last_chunk_mut" class="fn">split_last_chunk_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(
&amp;mut self
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>)&gt;</h4></section></summary><div class="docblock"><p>Return a mutable array reference to the last <code>N</code> items in the slice and the remaining
slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-58"><a class="doc-anchor" href="#examples-58">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((elements, last)) = x.split_last_chunk_mut::&lt;<span class="number">2</span>&gt;() {
last[<span class="number">0</span>] = <span class="number">3</span>;
last[<span class="number">1</span>] = <span class="number">4</span>;
elements[<span class="number">0</span>] = <span class="number">5</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">5</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, x.split_last_chunk_mut::&lt;<span class="number">4</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.last_chunk" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#548">source</a></span><h4 class="code-header">pub fn <a href="#method.last_chunk" class="fn">last_chunk</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>&gt;</h4></section></summary><div class="docblock"><p>Return an array reference to the last <code>N</code> items in the slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-59"><a class="doc-anchor" href="#examples-59">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>u = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">40</span>, <span class="number">30</span>]), u.last_chunk::&lt;<span class="number">2</span>&gt;());
<span class="kw">let </span>v: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[<span class="number">10</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, v.last_chunk::&lt;<span class="number">2</span>&gt;());
<span class="kw">let </span>w: <span class="kw-2">&amp;</span>[i32] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[]), w.last_chunk::&lt;<span class="number">0</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.last_chunk_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#582">source</a></span><h4 class="code-header">pub fn <a href="#method.last_chunk_mut" class="fn">last_chunk_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>&gt;</h4></section></summary><div class="docblock"><p>Return a mutable array reference to the last <code>N</code> items in the slice.</p>
<p>If the slice is not at least <code>N</code> in length, this will return <code>None</code>.</p>
<h5 id="examples-60"><a class="doc-anchor" href="#examples-60">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>(last) = x.last_chunk_mut::&lt;<span class="number">2</span>&gt;() {
last[<span class="number">0</span>] = <span class="number">10</span>;
last[<span class="number">1</span>] = <span class="number">20</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">10</span>, <span class="number">20</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, x.last_chunk_mut::&lt;<span class="number">4</span>&gt;());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#617-619">source</a></span><h4 class="code-header">pub fn <a href="#method.get" class="fn">get</a>&lt;I&gt;(&amp;self, index: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;&lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::index::SliceIndex::Output">Output</a>&gt;<div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;,</div></h4></section></summary><div class="docblock"><p>Returns a reference to an element or subslice depending on the type of
index.</p>
<ul>
<li>If given a position, returns a reference to the element at that
position or <code>None</code> if out of bounds.</li>
<li>If given a range, returns the subslice corresponding to that range,
or <code>None</code> if out of bounds.</li>
</ul>
<h5 id="examples-61"><a class="doc-anchor" href="#examples-61">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">40</span>), v.get(<span class="number">1</span>));
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>][..]), v.get(<span class="number">0</span>..<span class="number">2</span>));
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, v.get(<span class="number">3</span>));
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, v.get(<span class="number">0</span>..<span class="number">4</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#642-644">source</a></span><h4 class="code-header">pub fn <a href="#method.get_mut" class="fn">get_mut</a>&lt;I&gt;(
&amp;mut self,
index: I
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;mut &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::index::SliceIndex::Output">Output</a>&gt;<div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;,</div></h4></section></summary><div class="docblock"><p>Returns a mutable reference to an element or subslice depending on the
type of index (see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.get" title="method slice::get"><code>get</code></a>) or <code>None</code> if the index is out of bounds.</p>
<h5 id="examples-62"><a class="doc-anchor" href="#examples-62">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>(elem) = x.get_mut(<span class="number">1</span>) {
<span class="kw-2">*</span>elem = <span class="number">42</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">42</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_unchecked" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#679-681">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.get_unchecked" class="fn">get_unchecked</a>&lt;I&gt;(
&amp;self,
index: I
) -&gt; &amp;&lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::index::SliceIndex::Output">Output</a><div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;,</div></h4></section></summary><div class="docblock"><p>Returns a reference to an element or subslice, without doing bounds
checking.</p>
<p>For a safe alternative see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.get" title="method slice::get"><code>get</code></a>.</p>
<h5 id="safety-1"><a class="doc-anchor" href="#safety-1">§</a>Safety</h5>
<p>Calling this method with an out-of-bounds index is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em>
even if the resulting reference is not used.</p>
<p>You can think of this like <code>.get(index).unwrap_unchecked()</code>. It’s UB
to call <code>.get_unchecked(len)</code>, even if you immediately convert to a
pointer. And it’s UB to call <code>.get_unchecked(..len + 1)</code>,
<code>.get_unchecked(..=len)</code>, or similar.</p>
<h5 id="examples-63"><a class="doc-anchor" href="#examples-63">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">unsafe </span>{
<span class="macro">assert_eq!</span>(x.get_unchecked(<span class="number">1</span>), <span class="kw-2">&amp;</span><span class="number">2</span>);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_unchecked_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#721-723">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.get_unchecked_mut" class="fn">get_unchecked_mut</a>&lt;I&gt;(
&amp;mut self,
index: I
) -&gt; &amp;mut &lt;I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html#associatedtype.Output" title="type core::slice::index::SliceIndex::Output">Output</a><div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/index/trait.SliceIndex.html" title="trait core::slice::index::SliceIndex">SliceIndex</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;,</div></h4></section></summary><div class="docblock"><p>Returns a mutable reference to an element or subslice, without doing
bounds checking.</p>
<p>For a safe alternative see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.get_mut" title="method slice::get_mut"><code>get_mut</code></a>.</p>
<h5 id="safety-2"><a class="doc-anchor" href="#safety-2">§</a>Safety</h5>
<p>Calling this method with an out-of-bounds index is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em>
even if the resulting reference is not used.</p>
<p>You can think of this like <code>.get_mut(index).unwrap_unchecked()</code>. It’s
UB to call <code>.get_unchecked_mut(len)</code>, even if you immediately convert
to a pointer. And it’s UB to call <code>.get_unchecked_mut(..len + 1)</code>,
<code>.get_unchecked_mut(..=len)</code>, or similar.</p>
<h5 id="examples-64"><a class="doc-anchor" href="#examples-64">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">unsafe </span>{
<span class="kw">let </span>elem = x.get_unchecked_mut(<span class="number">1</span>);
<span class="kw-2">*</span>elem = <span class="number">13</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">13</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_ptr-1" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#762">source</a></span><h4 class="code-header">pub fn <a href="#method.as_ptr-1" class="fn">as_ptr</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const T</a></h4></section></summary><div class="docblock"><p>Returns a raw pointer to the slice’s buffer.</p>
<p>The caller must ensure that the slice outlives the pointer this
function returns, or else it will end up pointing to garbage.</p>
<p>The caller must also ensure that the memory the pointer (non-transitively) points to
is never written to (except inside an <code>UnsafeCell</code>) using this pointer or any pointer
derived from it. If you need to mutate the contents of the slice, use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.as_mut_ptr" title="method slice::as_mut_ptr"><code>as_mut_ptr</code></a>.</p>
<p>Modifying the container referenced by this slice may cause its buffer
to be reallocated, which would also make any pointers to it invalid.</p>
<h5 id="examples-65"><a class="doc-anchor" href="#examples-65">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">let </span>x_ptr = x.as_ptr();
<span class="kw">unsafe </span>{
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..x.len() {
<span class="macro">assert_eq!</span>(x.get_unchecked(i), <span class="kw-2">&amp;*</span>x_ptr.add(i));
}
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_mut_ptr-1" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#793">source</a></span><h4 class="code-header">pub fn <a href="#method.as_mut_ptr-1" class="fn">as_mut_ptr</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut T</a></h4></section></summary><div class="docblock"><p>Returns an unsafe mutable pointer to the slice’s buffer.</p>
<p>The caller must ensure that the slice outlives the pointer this
function returns, or else it will end up pointing to garbage.</p>
<p>Modifying the container referenced by this slice may cause its buffer
to be reallocated, which would also make any pointers to it invalid.</p>
<h5 id="examples-66"><a class="doc-anchor" href="#examples-66">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">let </span>x_ptr = x.as_mut_ptr();
<span class="kw">unsafe </span>{
<span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..x.len() {
<span class="kw-2">*</span>x_ptr.add(i) += <span class="number">2</span>;
}
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">6</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_ptr_range" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.48.0">1.48.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#829">source</a></span><h4 class="code-header">pub fn <a href="#method.as_ptr_range" class="fn">as_ptr_range</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/ops/range/struct.Range.html" title="struct core::ops::range::Range">Range</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const T</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the two raw pointers spanning the slice.</p>
<p>The returned range is half-open, which means that the end pointer
points <em>one past</em> the last element of the slice. This way, an empty
slice is represented by two equal pointers, and the difference between
the two pointers represents the size of the slice.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.as_ptr" title="method slice::as_ptr"><code>as_ptr</code></a> for warnings on using these pointers. The end pointer
requires extra caution, as it does not point to a valid element in the
slice.</p>
<p>This function is useful for interacting with foreign interfaces which
use two pointers to refer to a range of elements in memory, as is
common in C++.</p>
<p>It can also be useful to check if a pointer to an element refers to an
element of this slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>a = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let </span>x = <span class="kw-2">&amp;</span>a[<span class="number">1</span>] <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_</span>;
<span class="kw">let </span>y = <span class="kw-2">&amp;</span><span class="number">5 </span><span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_</span>;
<span class="macro">assert!</span>(a.as_ptr_range().contains(<span class="kw-2">&amp;</span>x));
<span class="macro">assert!</span>(!a.as_ptr_range().contains(<span class="kw-2">&amp;</span>y));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_mut_ptr_range" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.48.0">1.48.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#873">source</a></span><h4 class="code-header">pub fn <a href="#method.as_mut_ptr_range" class="fn">as_mut_ptr_range</a>(&amp;mut self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/ops/range/struct.Range.html" title="struct core::ops::range::Range">Range</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut T</a>&gt;</h4></section></summary><div class="docblock"><p>Returns the two unsafe mutable pointers spanning the slice.</p>
<p>The returned range is half-open, which means that the end pointer
points <em>one past</em> the last element of the slice. This way, an empty
slice is represented by two equal pointers, and the difference between
the two pointers represents the size of the slice.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.as_mut_ptr" title="method slice::as_mut_ptr"><code>as_mut_ptr</code></a> for warnings on using these pointers. The end
pointer requires extra caution, as it does not point to a valid element
in the slice.</p>
<p>This function is useful for interacting with foreign interfaces which
use two pointers to refer to a range of elements in memory, as is
common in C++.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#904">source</a></span><h4 class="code-header">pub fn <a href="#method.swap" class="fn">swap</a>(&amp;mut self, a: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, b: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Swaps two elements in the slice.</p>
<p>If <code>a</code> equals to <code>b</code>, it’s guaranteed that elements won’t change value.</p>
<h5 id="arguments"><a class="doc-anchor" href="#arguments">§</a>Arguments</h5>
<ul>
<li>a - The index of the first element</li>
<li>b - The index of the second element</li>
</ul>
<h5 id="panics-13"><a class="doc-anchor" href="#panics-13">§</a>Panics</h5>
<p>Panics if <code>a</code> or <code>b</code> are out of bounds.</p>
<h5 id="examples-67"><a class="doc-anchor" href="#examples-67">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"d"</span>, <span class="string">"e"</span>];
v.swap(<span class="number">2</span>, <span class="number">4</span>);
<span class="macro">assert!</span>(v == [<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"e"</span>, <span class="string">"d"</span>, <span class="string">"c"</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_unchecked" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#947">source</a><h4 class="code-header">pub unsafe fn <a href="#method.swap_unchecked" class="fn">swap_unchecked</a>(&amp;mut self, a: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, b: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_swap_unchecked</code>)</span></div></span></summary><div class="docblock"><p>Swaps two elements in the slice, without doing bounds checking.</p>
<p>For a safe alternative see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.swap" title="method slice::swap"><code>swap</code></a>.</p>
<h5 id="arguments-1"><a class="doc-anchor" href="#arguments-1">§</a>Arguments</h5>
<ul>
<li>a - The index of the first element</li>
<li>b - The index of the second element</li>
</ul>
<h5 id="safety-3"><a class="doc-anchor" href="#safety-3">§</a>Safety</h5>
<p>Calling this method with an out-of-bounds index is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em>.
The caller has to ensure that <code>a &lt; self.len()</code> and <code>b &lt; self.len()</code>.</p>
<h5 id="examples-68"><a class="doc-anchor" href="#examples-68">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_swap_unchecked)]
</span><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="string">"a"</span>, <span class="string">"b"</span>, <span class="string">"c"</span>, <span class="string">"d"</span>];
<span class="comment">// SAFETY: we know that 1 and 3 are both indices of the slice
</span><span class="kw">unsafe </span>{ v.swap_unchecked(<span class="number">1</span>, <span class="number">3</span>) };
<span class="macro">assert!</span>(v == [<span class="string">"a"</span>, <span class="string">"d"</span>, <span class="string">"c"</span>, <span class="string">"b"</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.reverse" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#976">source</a></span><h4 class="code-header">pub fn <a href="#method.reverse" class="fn">reverse</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Reverses the order of elements in the slice, in place.</p>
<h5 id="examples-69"><a class="doc-anchor" href="#examples-69">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
v.reverse();
<span class="macro">assert!</span>(v == [<span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.iter" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1034">source</a></span><h4 class="code-header">pub fn <a href="#method.iter" class="fn">iter</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over the slice.</p>
<p>The iterator yields all items from start to end.</p>
<h5 id="examples-70"><a class="doc-anchor" href="#examples-70">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iterator = x.iter();
<span class="macro">assert_eq!</span>(iterator.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">1</span>));
<span class="macro">assert_eq!</span>(iterator.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">2</span>));
<span class="macro">assert_eq!</span>(iterator.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">4</span>));
<span class="macro">assert_eq!</span>(iterator.next(), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.iter_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1053">source</a></span><h4 class="code-header">pub fn <a href="#method.iter_mut" class="fn">iter_mut</a>(&amp;mut self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.IterMut.html" title="struct core::slice::iter::IterMut">IterMut</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator that allows modifying each value.</p>
<p>The iterator yields all items from start to end.</p>
<h5 id="examples-71"><a class="doc-anchor" href="#examples-71">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">for </span>elem <span class="kw">in </span>x.iter_mut() {
<span class="kw-2">*</span>elem += <span class="number">2</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">6</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.windows" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1102">source</a></span><h4 class="code-header">pub fn <a href="#method.windows" class="fn">windows</a>(&amp;self, size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.Windows.html" title="struct core::slice::iter::Windows">Windows</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over all contiguous windows of length
<code>size</code>. The windows overlap. If the slice is shorter than
<code>size</code>, the iterator returns no values.</p>
<h5 id="panics-14"><a class="doc-anchor" href="#panics-14">§</a>Panics</h5>
<p>Panics if <code>size</code> is 0.</p>
<h5 id="examples-72"><a class="doc-anchor" href="#examples-72">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.windows(<span class="number">3</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
<p>If the slice is shorter than <code>size</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="string">'f'</span>, <span class="string">'o'</span>, <span class="string">'o'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.windows(<span class="number">4</span>);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
<p>There’s no <code>windows_mut</code>, as that existing would let safe code violate the
“only one <code>&amp;mut</code> at a time to the same thing” rule. However, you can sometimes
use <a href="https://doc.rust-lang.org/nightly/core/cell/struct.Cell.html#method.as_slice_of_cells" title="method core::cell::Cell::as_slice_of_cells"><code>Cell::as_slice_of_cells</code></a> in
conjunction with <code>windows</code> to accomplish something similar:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::cell::Cell;
<span class="kw">let </span><span class="kw-2">mut </span>array = [<span class="string">'R'</span>, <span class="string">'u'</span>, <span class="string">'s'</span>, <span class="string">'t'</span>, <span class="string">' '</span>, <span class="string">'2'</span>, <span class="string">'0'</span>, <span class="string">'1'</span>, <span class="string">'5'</span>];
<span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span>array[..];
<span class="kw">let </span>slice_of_cells: <span class="kw-2">&amp;</span>[Cell&lt;char&gt;] = Cell::from_mut(slice).as_slice_of_cells();
<span class="kw">for </span>w <span class="kw">in </span>slice_of_cells.windows(<span class="number">3</span>) {
Cell::swap(<span class="kw-2">&amp;</span>w[<span class="number">0</span>], <span class="kw-2">&amp;</span>w[<span class="number">2</span>]);
}
<span class="macro">assert_eq!</span>(array, [<span class="string">'s'</span>, <span class="string">'t'</span>, <span class="string">' '</span>, <span class="string">'2'</span>, <span class="string">'0'</span>, <span class="string">'1'</span>, <span class="string">'5'</span>, <span class="string">'u'</span>, <span class="string">'R'</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.chunks" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1137">source</a></span><h4 class="code-header">pub fn <a href="#method.chunks" class="fn">chunks</a>(&amp;self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.Chunks.html" title="struct core::slice::iter::Chunks">Chunks</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the
beginning of the slice.</p>
<p>The chunks are slices and do not overlap. If <code>chunk_size</code> does not divide the length of the
slice, then the last chunk will not have length <code>chunk_size</code>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_exact" title="method slice::chunks_exact"><code>chunks_exact</code></a> for a variant of this iterator that returns chunks of always exactly
<code>chunk_size</code> elements, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks" title="method slice::rchunks"><code>rchunks</code></a> for the same iterator but starting at the end of the
slice.</p>
<h5 id="panics-15"><a class="doc-anchor" href="#panics-15">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-73"><a class="doc-anchor" href="#examples-73">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.chunks(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'l'</span>, <span class="string">'o'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'r'</span>, <span class="string">'e'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'m'</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.chunks_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1176">source</a></span><h4 class="code-header">pub fn <a href="#method.chunks_mut" class="fn">chunks_mut</a>(&amp;mut self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ChunksMut.html" title="struct core::slice::iter::ChunksMut">ChunksMut</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the
beginning of the slice.</p>
<p>The chunks are mutable slices, and do not overlap. If <code>chunk_size</code> does not divide the
length of the slice, then the last chunk will not have length <code>chunk_size</code>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_exact_mut" title="method slice::chunks_exact_mut"><code>chunks_exact_mut</code></a> for a variant of this iterator that returns chunks of always
exactly <code>chunk_size</code> elements, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks_mut" title="method slice::rchunks_mut"><code>rchunks_mut</code></a> for the same iterator but starting at
the end of the slice.</p>
<h5 id="panics-16"><a class="doc-anchor" href="#panics-16">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-74"><a class="doc-anchor" href="#examples-74">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>v.chunks_mut(<span class="number">2</span>) {
<span class="kw">for </span>elem <span class="kw">in </span>chunk.iter_mut() {
<span class="kw-2">*</span>elem += count;
}
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">3</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.chunks_exact" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.31.0">1.31.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1214">source</a></span><h4 class="code-header">pub fn <a href="#method.chunks_exact" class="fn">chunks_exact</a>(&amp;self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ChunksExact.html" title="struct core::slice::iter::ChunksExact">ChunksExact</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the
beginning of the slice.</p>
<p>The chunks are slices and do not overlap. If <code>chunk_size</code> does not divide the length of the
slice, then the last up to <code>chunk_size-1</code> elements will be omitted and can be retrieved
from the <code>remainder</code> function of the iterator.</p>
<p>Due to each chunk having exactly <code>chunk_size</code> elements, the compiler can often optimize the
resulting code better than in the case of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks" title="method slice::chunks"><code>chunks</code></a>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks" title="method slice::chunks"><code>chunks</code></a> for a variant of this iterator that also returns the remainder as a smaller
chunk, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks_exact" title="method slice::rchunks_exact"><code>rchunks_exact</code></a> for the same iterator but starting at the end of the slice.</p>
<h5 id="panics-17"><a class="doc-anchor" href="#panics-17">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-75"><a class="doc-anchor" href="#examples-75">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.chunks_exact(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'l'</span>, <span class="string">'o'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'r'</span>, <span class="string">'e'</span>]);
<span class="macro">assert!</span>(iter.next().is_none());
<span class="macro">assert_eq!</span>(iter.remainder(), <span class="kw-2">&amp;</span>[<span class="string">'m'</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.chunks_exact_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.31.0">1.31.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1257">source</a></span><h4 class="code-header">pub fn <a href="#method.chunks_exact_mut" class="fn">chunks_exact_mut</a>(&amp;mut self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ChunksExactMut.html" title="struct core::slice::iter::ChunksExactMut">ChunksExactMut</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the
beginning of the slice.</p>
<p>The chunks are mutable slices, and do not overlap. If <code>chunk_size</code> does not divide the
length of the slice, then the last up to <code>chunk_size-1</code> elements will be omitted and can be
retrieved from the <code>into_remainder</code> function of the iterator.</p>
<p>Due to each chunk having exactly <code>chunk_size</code> elements, the compiler can often optimize the
resulting code better than in the case of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_mut" title="method slice::chunks_mut"><code>chunks_mut</code></a>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_mut" title="method slice::chunks_mut"><code>chunks_mut</code></a> for a variant of this iterator that also returns the remainder as a
smaller chunk, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks_exact_mut" title="method slice::rchunks_exact_mut"><code>rchunks_exact_mut</code></a> for the same iterator but starting at the end of
the slice.</p>
<h5 id="panics-18"><a class="doc-anchor" href="#panics-18">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-76"><a class="doc-anchor" href="#examples-76">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>v.chunks_exact_mut(<span class="number">2</span>) {
<span class="kw">for </span>elem <span class="kw">in </span>chunk.iter_mut() {
<span class="kw-2">*</span>elem += count;
}
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">0</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_chunks_unchecked" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1292">source</a><h4 class="code-header">pub unsafe fn <a href="#method.as_chunks_unchecked" class="fn">as_chunks_unchecked</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>]</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_as_chunks</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice into a slice of <code>N</code>-element arrays,
assuming that there’s no remainder.</p>
<h5 id="safety-4"><a class="doc-anchor" href="#safety-4">§</a>Safety</h5>
<p>This may only be called when</p>
<ul>
<li>The slice splits exactly into <code>N</code>-element chunks (aka <code>self.len() % N == 0</code>).</li>
<li><code>N != 0</code>.</li>
</ul>
<h5 id="examples-77"><a class="doc-anchor" href="#examples-77">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>slice: <span class="kw-2">&amp;</span>[char] = <span class="kw-2">&amp;</span>[<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>, <span class="string">'!'</span>];
<span class="kw">let </span>chunks: <span class="kw-2">&amp;</span>[[char; <span class="number">1</span>]] =
<span class="comment">// SAFETY: 1-element chunks never have remainder
</span><span class="kw">unsafe </span>{ slice.as_chunks_unchecked() };
<span class="macro">assert_eq!</span>(chunks, <span class="kw-2">&amp;</span>[[<span class="string">'l'</span>], [<span class="string">'o'</span>], [<span class="string">'r'</span>], [<span class="string">'e'</span>], [<span class="string">'m'</span>], [<span class="string">'!'</span>]]);
<span class="kw">let </span>chunks: <span class="kw-2">&amp;</span>[[char; <span class="number">3</span>]] =
<span class="comment">// SAFETY: The slice length (6) is a multiple of 3
</span><span class="kw">unsafe </span>{ slice.as_chunks_unchecked() };
<span class="macro">assert_eq!</span>(chunks, <span class="kw-2">&amp;</span>[[<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>], [<span class="string">'e'</span>, <span class="string">'m'</span>, <span class="string">'!'</span>]]);
<span class="comment">// These would be unsound:
// let chunks: &amp;[[_; 5]] = slice.as_chunks_unchecked() // The slice length is not a multiple of 5
// let chunks: &amp;[[_; 0]] = slice.as_chunks_unchecked() // Zero-length chunks are never allowed</span></code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_chunks" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1338">source</a><h4 class="code-header">pub fn <a href="#method.as_chunks" class="fn">as_chunks</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; (&amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>], &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_as_chunks</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice into a slice of <code>N</code>-element arrays,
starting at the beginning of the slice,
and a remainder slice with length strictly less than <code>N</code>.</p>
<h5 id="panics-19"><a class="doc-anchor" href="#panics-19">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-78"><a class="doc-anchor" href="#examples-78">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span>(chunks, remainder) = slice.as_chunks();
<span class="macro">assert_eq!</span>(chunks, <span class="kw-2">&amp;</span>[[<span class="string">'l'</span>, <span class="string">'o'</span>], [<span class="string">'r'</span>, <span class="string">'e'</span>]]);
<span class="macro">assert_eq!</span>(remainder, <span class="kw-2">&amp;</span>[<span class="string">'m'</span>]);</code></pre></div>
<p>If you expect the slice to be an exact multiple, you can combine
<code>let</code>-<code>else</code> with an empty slice pattern:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>slice = [<span class="string">'R'</span>, <span class="string">'u'</span>, <span class="string">'s'</span>, <span class="string">'t'</span>];
<span class="kw">let </span>(chunks, []) = slice.as_chunks::&lt;<span class="number">2</span>&gt;() <span class="kw">else </span>{
<span class="macro">panic!</span>(<span class="string">"slice didn't have even length"</span>)
};
<span class="macro">assert_eq!</span>(chunks, <span class="kw-2">&amp;</span>[[<span class="string">'R'</span>, <span class="string">'u'</span>], [<span class="string">'s'</span>, <span class="string">'t'</span>]]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_rchunks" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1372">source</a><h4 class="code-header">pub fn <a href="#method.as_rchunks" class="fn">as_rchunks</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; (&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>])</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_as_chunks</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice into a slice of <code>N</code>-element arrays,
starting at the end of the slice,
and a remainder slice with length strictly less than <code>N</code>.</p>
<h5 id="panics-20"><a class="doc-anchor" href="#panics-20">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-79"><a class="doc-anchor" href="#examples-79">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span>(remainder, chunks) = slice.as_rchunks();
<span class="macro">assert_eq!</span>(remainder, <span class="kw-2">&amp;</span>[<span class="string">'l'</span>]);
<span class="macro">assert_eq!</span>(chunks, <span class="kw-2">&amp;</span>[[<span class="string">'o'</span>, <span class="string">'r'</span>], [<span class="string">'e'</span>, <span class="string">'m'</span>]]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.array_chunks" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1412">source</a><h4 class="code-header">pub fn <a href="#method.array_chunks" class="fn">array_chunks</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ArrayChunks.html" title="struct core::slice::iter::ArrayChunks">ArrayChunks</a>&lt;'_, T, N&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>array_chunks</code>)</span></div></span></summary><div class="docblock"><p>Returns an iterator over <code>N</code> elements of the slice at a time, starting at the
beginning of the slice.</p>
<p>The chunks are array references and do not overlap. If <code>N</code> does not divide the
length of the slice, then the last up to <code>N-1</code> elements will be omitted and can be
retrieved from the <code>remainder</code> function of the iterator.</p>
<p>This method is the const generic equivalent of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_exact" title="method slice::chunks_exact"><code>chunks_exact</code></a>.</p>
<h5 id="panics-21"><a class="doc-anchor" href="#panics-21">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-80"><a class="doc-anchor" href="#examples-80">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(array_chunks)]
</span><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.array_chunks();
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'l'</span>, <span class="string">'o'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'r'</span>, <span class="string">'e'</span>]);
<span class="macro">assert!</span>(iter.next().is_none());
<span class="macro">assert_eq!</span>(iter.remainder(), <span class="kw-2">&amp;</span>[<span class="string">'m'</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_chunks_unchecked_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1449">source</a><h4 class="code-header">pub unsafe fn <a href="#method.as_chunks_unchecked_mut" class="fn">as_chunks_unchecked_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(
&amp;mut self
) -&gt; &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>]</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_as_chunks</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice into a slice of <code>N</code>-element arrays,
assuming that there’s no remainder.</p>
<h5 id="safety-5"><a class="doc-anchor" href="#safety-5">§</a>Safety</h5>
<p>This may only be called when</p>
<ul>
<li>The slice splits exactly into <code>N</code>-element chunks (aka <code>self.len() % N == 0</code>).</li>
<li><code>N != 0</code>.</li>
</ul>
<h5 id="examples-81"><a class="doc-anchor" href="#examples-81">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>slice: <span class="kw-2">&amp;mut </span>[char] = <span class="kw-2">&amp;mut </span>[<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>, <span class="string">'!'</span>];
<span class="kw">let </span>chunks: <span class="kw-2">&amp;mut </span>[[char; <span class="number">1</span>]] =
<span class="comment">// SAFETY: 1-element chunks never have remainder
</span><span class="kw">unsafe </span>{ slice.as_chunks_unchecked_mut() };
chunks[<span class="number">0</span>] = [<span class="string">'L'</span>];
<span class="macro">assert_eq!</span>(chunks, <span class="kw-2">&amp;</span>[[<span class="string">'L'</span>], [<span class="string">'o'</span>], [<span class="string">'r'</span>], [<span class="string">'e'</span>], [<span class="string">'m'</span>], [<span class="string">'!'</span>]]);
<span class="kw">let </span>chunks: <span class="kw-2">&amp;mut </span>[[char; <span class="number">3</span>]] =
<span class="comment">// SAFETY: The slice length (6) is a multiple of 3
</span><span class="kw">unsafe </span>{ slice.as_chunks_unchecked_mut() };
chunks[<span class="number">1</span>] = [<span class="string">'a'</span>, <span class="string">'x'</span>, <span class="string">'?'</span>];
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'L'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'a'</span>, <span class="string">'x'</span>, <span class="string">'?'</span>]);
<span class="comment">// These would be unsound:
// let chunks: &amp;[[_; 5]] = slice.as_chunks_unchecked_mut() // The slice length is not a multiple of 5
// let chunks: &amp;[[_; 0]] = slice.as_chunks_unchecked_mut() // Zero-length chunks are never allowed</span></code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_chunks_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1490">source</a><h4 class="code-header">pub fn <a href="#method.as_chunks_mut" class="fn">as_chunks_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;mut self) -&gt; (&amp;mut [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>], &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_as_chunks</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice into a slice of <code>N</code>-element arrays,
starting at the beginning of the slice,
and a remainder slice with length strictly less than <code>N</code>.</p>
<h5 id="panics-22"><a class="doc-anchor" href="#panics-22">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-82"><a class="doc-anchor" href="#examples-82">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">let </span>(chunks, remainder) = v.as_chunks_mut();
remainder[<span class="number">0</span>] = <span class="number">9</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>chunks {
<span class="kw-2">*</span>chunk = [count; <span class="number">2</span>];
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">9</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_rchunks_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1530">source</a><h4 class="code-header">pub fn <a href="#method.as_rchunks_mut" class="fn">as_rchunks_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;mut self) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; N]</a>])</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_as_chunks</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice into a slice of <code>N</code>-element arrays,
starting at the end of the slice,
and a remainder slice with length strictly less than <code>N</code>.</p>
<h5 id="panics-23"><a class="doc-anchor" href="#panics-23">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-83"><a class="doc-anchor" href="#examples-83">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_as_chunks)]
</span><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">let </span>(remainder, chunks) = v.as_rchunks_mut();
remainder[<span class="number">0</span>] = <span class="number">9</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>chunks {
<span class="kw-2">*</span>chunk = [count; <span class="number">2</span>];
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">9</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.array_chunks_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1572">source</a><h4 class="code-header">pub fn <a href="#method.array_chunks_mut" class="fn">array_chunks_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;mut self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ArrayChunksMut.html" title="struct core::slice::iter::ArrayChunksMut">ArrayChunksMut</a>&lt;'_, T, N&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>array_chunks</code>)</span></div></span></summary><div class="docblock"><p>Returns an iterator over <code>N</code> elements of the slice at a time, starting at the
beginning of the slice.</p>
<p>The chunks are mutable array references and do not overlap. If <code>N</code> does not divide
the length of the slice, then the last up to <code>N-1</code> elements will be omitted and
can be retrieved from the <code>into_remainder</code> function of the iterator.</p>
<p>This method is the const generic equivalent of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_exact_mut" title="method slice::chunks_exact_mut"><code>chunks_exact_mut</code></a>.</p>
<h5 id="panics-24"><a class="doc-anchor" href="#panics-24">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-84"><a class="doc-anchor" href="#examples-84">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(array_chunks)]
</span><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>v.array_chunks_mut() {
<span class="kw-2">*</span>chunk = [count; <span class="number">2</span>];
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">0</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.array_windows" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1605">source</a><h4 class="code-header">pub fn <a href="#method.array_windows" class="fn">array_windows</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ArrayWindows.html" title="struct core::slice::iter::ArrayWindows">ArrayWindows</a>&lt;'_, T, N&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>array_windows</code>)</span></div></span></summary><div class="docblock"><p>Returns an iterator over overlapping windows of <code>N</code> elements of a slice,
starting at the beginning of the slice.</p>
<p>This is the const generic equivalent of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.windows" title="method slice::windows"><code>windows</code></a>.</p>
<p>If <code>N</code> is greater than the size of the slice, it will return no windows.</p>
<h5 id="panics-25"><a class="doc-anchor" href="#panics-25">§</a>Panics</h5>
<p>Panics if <code>N</code> is 0. This check will most probably get changed to a compile time
error before this method gets stabilized.</p>
<h5 id="examples-85"><a class="doc-anchor" href="#examples-85">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(array_windows)]
</span><span class="kw">let </span>slice = [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.array_windows();
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">3</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rchunks" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.31.0">1.31.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1640">source</a></span><h4 class="code-header">pub fn <a href="#method.rchunks" class="fn">rchunks</a>(&amp;self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RChunks.html" title="struct core::slice::iter::RChunks">RChunks</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the end
of the slice.</p>
<p>The chunks are slices and do not overlap. If <code>chunk_size</code> does not divide the length of the
slice, then the last chunk will not have length <code>chunk_size</code>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks_exact" title="method slice::rchunks_exact"><code>rchunks_exact</code></a> for a variant of this iterator that returns chunks of always exactly
<code>chunk_size</code> elements, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks" title="method slice::chunks"><code>chunks</code></a> for the same iterator but starting at the beginning
of the slice.</p>
<h5 id="panics-26"><a class="doc-anchor" href="#panics-26">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-86"><a class="doc-anchor" href="#examples-86">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.rchunks(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'e'</span>, <span class="string">'m'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'o'</span>, <span class="string">'r'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'l'</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rchunks_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.31.0">1.31.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1679">source</a></span><h4 class="code-header">pub fn <a href="#method.rchunks_mut" class="fn">rchunks_mut</a>(&amp;mut self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RChunksMut.html" title="struct core::slice::iter::RChunksMut">RChunksMut</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the end
of the slice.</p>
<p>The chunks are mutable slices, and do not overlap. If <code>chunk_size</code> does not divide the
length of the slice, then the last chunk will not have length <code>chunk_size</code>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks_exact_mut" title="method slice::rchunks_exact_mut"><code>rchunks_exact_mut</code></a> for a variant of this iterator that returns chunks of always
exactly <code>chunk_size</code> elements, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_mut" title="method slice::chunks_mut"><code>chunks_mut</code></a> for the same iterator but starting at the
beginning of the slice.</p>
<h5 id="panics-27"><a class="doc-anchor" href="#panics-27">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-87"><a class="doc-anchor" href="#examples-87">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>v.rchunks_mut(<span class="number">2</span>) {
<span class="kw">for </span>elem <span class="kw">in </span>chunk.iter_mut() {
<span class="kw-2">*</span>elem += count;
}
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rchunks_exact" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.31.0">1.31.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1719">source</a></span><h4 class="code-header">pub fn <a href="#method.rchunks_exact" class="fn">rchunks_exact</a>(&amp;self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RChunksExact.html" title="struct core::slice::iter::RChunksExact">RChunksExact</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the
end of the slice.</p>
<p>The chunks are slices and do not overlap. If <code>chunk_size</code> does not divide the length of the
slice, then the last up to <code>chunk_size-1</code> elements will be omitted and can be retrieved
from the <code>remainder</code> function of the iterator.</p>
<p>Due to each chunk having exactly <code>chunk_size</code> elements, the compiler can often optimize the
resulting code better than in the case of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks" title="method slice::rchunks"><code>rchunks</code></a>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks" title="method slice::rchunks"><code>rchunks</code></a> for a variant of this iterator that also returns the remainder as a smaller
chunk, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_exact" title="method slice::chunks_exact"><code>chunks_exact</code></a> for the same iterator but starting at the beginning of the
slice.</p>
<h5 id="panics-28"><a class="doc-anchor" href="#panics-28">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-88"><a class="doc-anchor" href="#examples-88">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="string">'l'</span>, <span class="string">'o'</span>, <span class="string">'r'</span>, <span class="string">'e'</span>, <span class="string">'m'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.rchunks_exact(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'e'</span>, <span class="string">'m'</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="string">'o'</span>, <span class="string">'r'</span>]);
<span class="macro">assert!</span>(iter.next().is_none());
<span class="macro">assert_eq!</span>(iter.remainder(), <span class="kw-2">&amp;</span>[<span class="string">'l'</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rchunks_exact_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.31.0">1.31.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1763">source</a></span><h4 class="code-header">pub fn <a href="#method.rchunks_exact_mut" class="fn">rchunks_exact_mut</a>(&amp;mut self, chunk_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RChunksExactMut.html" title="struct core::slice::iter::RChunksExactMut">RChunksExactMut</a>&lt;'_, T&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator over <code>chunk_size</code> elements of the slice at a time, starting at the end
of the slice.</p>
<p>The chunks are mutable slices, and do not overlap. If <code>chunk_size</code> does not divide the
length of the slice, then the last up to <code>chunk_size-1</code> elements will be omitted and can be
retrieved from the <code>into_remainder</code> function of the iterator.</p>
<p>Due to each chunk having exactly <code>chunk_size</code> elements, the compiler can often optimize the
resulting code better than in the case of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_mut" title="method slice::chunks_mut"><code>chunks_mut</code></a>.</p>
<p>See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.rchunks_mut" title="method slice::rchunks_mut"><code>rchunks_mut</code></a> for a variant of this iterator that also returns the remainder as a
smaller chunk, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.chunks_exact_mut" title="method slice::chunks_exact_mut"><code>chunks_exact_mut</code></a> for the same iterator but starting at the beginning
of the slice.</p>
<h5 id="panics-29"><a class="doc-anchor" href="#panics-29">§</a>Panics</h5>
<p>Panics if <code>chunk_size</code> is 0.</p>
<h5 id="examples-89"><a class="doc-anchor" href="#examples-89">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">1</span>;
<span class="kw">for </span>chunk <span class="kw">in </span>v.rchunks_exact_mut(<span class="number">2</span>) {
<span class="kw">for </span>elem <span class="kw">in </span>chunk.iter_mut() {
<span class="kw-2">*</span>elem += count;
}
count += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.chunk_by" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1802-1804">source</a></span><h4 class="code-header">pub fn <a href="#method.chunk_by" class="fn">chunk_by</a>&lt;F&gt;(&amp;self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ChunkBy.html" title="struct core::slice::iter::ChunkBy">ChunkBy</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over the slice producing non-overlapping runs
of elements using the predicate to separate them.</p>
<p>The predicate is called for every pair of consecutive elements,
meaning that it is called on <code>slice[0]</code> and <code>slice[1]</code>,
followed by <code>slice[1]</code> and <code>slice[2]</code>, and so on.</p>
<h5 id="examples-90"><a class="doc-anchor" href="#examples-90">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.chunk_by(|a, b| a == b);
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">3</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">None</span>);</code></pre></div>
<p>This method can be used to extract the sorted subslices:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.chunk_by(|a, b| a &lt;= b);
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">3</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.chunk_by_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.77.0">1.77.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1843-1845">source</a></span><h4 class="code-header">pub fn <a href="#method.chunk_by_mut" class="fn">chunk_by_mut</a>&lt;F&gt;(&amp;mut self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.ChunkByMut.html" title="struct core::slice::iter::ChunkByMut">ChunkByMut</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over the slice producing non-overlapping mutable
runs of elements using the predicate to separate them.</p>
<p>The predicate is called for every pair of consecutive elements,
meaning that it is called on <code>slice[0]</code> and <code>slice[1]</code>,
followed by <code>slice[1]</code> and <code>slice[2]</code>, and so on.</p>
<h5 id="examples-91"><a class="doc-anchor" href="#examples-91">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.chunk_by_mut(|a, b| a == b);
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>[<span class="number">3</span>, <span class="number">3</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>[<span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">None</span>);</code></pre></div>
<p>This method can be used to extract the sorted subslices:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.chunk_by_mut(|a, b| a &lt;= b);
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>[<span class="number">2</span>, <span class="number">3</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>][..]));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1890">source</a></span><h4 class="code-header">pub fn <a href="#method.split_at" class="fn">split_at</a>(&amp;self, mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; (&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Divides one slice into two at an index.</p>
<p>The first will contain all indices from <code>[0, mid)</code> (excluding
the index <code>mid</code> itself) and the second will contain all
indices from <code>[mid, len)</code> (excluding the index <code>len</code> itself).</p>
<h5 id="panics-30"><a class="doc-anchor" href="#panics-30">§</a>Panics</h5>
<p>Panics if <code>mid &gt; len</code>. For a non-panicking alternative see
<a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at_checked" title="method slice::split_at_checked"><code>split_at_checked</code></a>.</p>
<h5 id="examples-92"><a class="doc-anchor" href="#examples-92">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>];
{
<span class="kw">let </span>(left, right) = v.split_at(<span class="number">0</span>);
<span class="macro">assert_eq!</span>(left, []);
<span class="macro">assert_eq!</span>(right, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
}
{
<span class="kw">let </span>(left, right) = v.split_at(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">2</span>]);
<span class="macro">assert_eq!</span>(right, [<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
}
{
<span class="kw">let </span>(left, right) = v.split_at(<span class="number">6</span>);
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
<span class="macro">assert_eq!</span>(right, []);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1924">source</a></span><h4 class="code-header">pub fn <a href="#method.split_at_mut" class="fn">split_at_mut</a>(&amp;mut self, mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Divides one mutable slice into two at an index.</p>
<p>The first will contain all indices from <code>[0, mid)</code> (excluding
the index <code>mid</code> itself) and the second will contain all
indices from <code>[mid, len)</code> (excluding the index <code>len</code> itself).</p>
<h5 id="panics-31"><a class="doc-anchor" href="#panics-31">§</a>Panics</h5>
<p>Panics if <code>mid &gt; len</code>. For a non-panicking alternative see
<a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at_mut_checked" title="method slice::split_at_mut_checked"><code>split_at_mut_checked</code></a>.</p>
<h5 id="examples-93"><a class="doc-anchor" href="#examples-93">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">1</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>];
<span class="kw">let </span>(left, right) = v.split_at_mut(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">0</span>]);
<span class="macro">assert_eq!</span>(right, [<span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>]);
left[<span class="number">1</span>] = <span class="number">2</span>;
right[<span class="number">1</span>] = <span class="number">4</span>;
<span class="macro">assert_eq!</span>(v, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at_unchecked" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.79.0">1.79.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#1975">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.split_at_unchecked" class="fn">split_at_unchecked</a>(&amp;self, mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; (&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Divides one slice into two at an index, without doing bounds checking.</p>
<p>The first will contain all indices from <code>[0, mid)</code> (excluding
the index <code>mid</code> itself) and the second will contain all
indices from <code>[mid, len)</code> (excluding the index <code>len</code> itself).</p>
<p>For a safe alternative see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at" title="method slice::split_at"><code>split_at</code></a>.</p>
<h5 id="safety-6"><a class="doc-anchor" href="#safety-6">§</a>Safety</h5>
<p>Calling this method with an out-of-bounds index is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em>
even if the resulting reference is not used. The caller has to ensure that
<code>0 &lt;= mid &lt;= self.len()</code>.</p>
<h5 id="examples-94"><a class="doc-anchor" href="#examples-94">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>];
<span class="kw">unsafe </span>{
<span class="kw">let </span>(left, right) = v.split_at_unchecked(<span class="number">0</span>);
<span class="macro">assert_eq!</span>(left, []);
<span class="macro">assert_eq!</span>(right, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
}
<span class="kw">unsafe </span>{
<span class="kw">let </span>(left, right) = v.split_at_unchecked(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">2</span>]);
<span class="macro">assert_eq!</span>(right, [<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
}
<span class="kw">unsafe </span>{
<span class="kw">let </span>(left, right) = v.split_at_unchecked(<span class="number">6</span>);
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
<span class="macro">assert_eq!</span>(right, []);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at_mut_unchecked" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.79.0">1.79.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2028">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.split_at_mut_unchecked" class="fn">split_at_mut_unchecked</a>(
&amp;mut self,
mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>
) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Divides one mutable slice into two at an index, without doing bounds checking.</p>
<p>The first will contain all indices from <code>[0, mid)</code> (excluding
the index <code>mid</code> itself) and the second will contain all
indices from <code>[mid, len)</code> (excluding the index <code>len</code> itself).</p>
<p>For a safe alternative see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at_mut" title="method slice::split_at_mut"><code>split_at_mut</code></a>.</p>
<h5 id="safety-7"><a class="doc-anchor" href="#safety-7">§</a>Safety</h5>
<p>Calling this method with an out-of-bounds index is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em>
even if the resulting reference is not used. The caller has to ensure that
<code>0 &lt;= mid &lt;= self.len()</code>.</p>
<h5 id="examples-95"><a class="doc-anchor" href="#examples-95">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">1</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>];
<span class="comment">// scoped to restrict the lifetime of the borrows
</span><span class="kw">unsafe </span>{
<span class="kw">let </span>(left, right) = v.split_at_mut_unchecked(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">0</span>]);
<span class="macro">assert_eq!</span>(right, [<span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>]);
left[<span class="number">1</span>] = <span class="number">2</span>;
right[<span class="number">1</span>] = <span class="number">4</span>;
}
<span class="macro">assert_eq!</span>(v, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at_checked" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2089">source</a></span><h4 class="code-header">pub fn <a href="#method.split_at_checked" class="fn">split_at_checked</a>(&amp;self, mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Divides one slice into two at an index, returning <code>None</code> if the slice is
too short.</p>
<p>If <code>mid ≤ len</code> returns a pair of slices where the first will contain all
indices from <code>[0, mid)</code> (excluding the index <code>mid</code> itself) and the
second will contain all indices from <code>[mid, len)</code> (excluding the index
<code>len</code> itself).</p>
<p>Otherwise, if <code>mid &gt; len</code>, returns <code>None</code>.</p>
<h5 id="examples-96"><a class="doc-anchor" href="#examples-96">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">1</span>, -<span class="number">2</span>, <span class="number">3</span>, -<span class="number">4</span>, <span class="number">5</span>, -<span class="number">6</span>];
{
<span class="kw">let </span>(left, right) = v.split_at_checked(<span class="number">0</span>).unwrap();
<span class="macro">assert_eq!</span>(left, []);
<span class="macro">assert_eq!</span>(right, [<span class="number">1</span>, -<span class="number">2</span>, <span class="number">3</span>, -<span class="number">4</span>, <span class="number">5</span>, -<span class="number">6</span>]);
}
{
<span class="kw">let </span>(left, right) = v.split_at_checked(<span class="number">2</span>).unwrap();
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, -<span class="number">2</span>]);
<span class="macro">assert_eq!</span>(right, [<span class="number">3</span>, -<span class="number">4</span>, <span class="number">5</span>, -<span class="number">6</span>]);
}
{
<span class="kw">let </span>(left, right) = v.split_at_checked(<span class="number">6</span>).unwrap();
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, -<span class="number">2</span>, <span class="number">3</span>, -<span class="number">4</span>, <span class="number">5</span>, -<span class="number">6</span>]);
<span class="macro">assert_eq!</span>(right, []);
}
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, v.split_at_checked(<span class="number">7</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_at_mut_checked" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2128">source</a></span><h4 class="code-header">pub fn <a href="#method.split_at_mut_checked" class="fn">split_at_mut_checked</a>(
&amp;mut self,
mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;</h4></section></summary><div class="docblock"><p>Divides one mutable slice into two at an index, returning <code>None</code> if the
slice is too short.</p>
<p>If <code>mid ≤ len</code> returns a pair of slices where the first will contain all
indices from <code>[0, mid)</code> (excluding the index <code>mid</code> itself) and the
second will contain all indices from <code>[mid, len)</code> (excluding the index
<code>len</code> itself).</p>
<p>Otherwise, if <code>mid &gt; len</code>, returns <code>None</code>.</p>
<h5 id="examples-97"><a class="doc-anchor" href="#examples-97">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">1</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>];
<span class="kw">if let </span><span class="prelude-val">Some</span>((left, right)) = v.split_at_mut_checked(<span class="number">2</span>) {
<span class="macro">assert_eq!</span>(left, [<span class="number">1</span>, <span class="number">0</span>]);
<span class="macro">assert_eq!</span>(right, [<span class="number">3</span>, <span class="number">0</span>, <span class="number">5</span>, <span class="number">6</span>]);
left[<span class="number">1</span>] = <span class="number">2</span>;
right[<span class="number">1</span>] = <span class="number">4</span>;
}
<span class="macro">assert_eq!</span>(v, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>]);
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, v.split_at_mut_checked(<span class="number">7</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2180-2182">source</a></span><h4 class="code-header">pub fn <a href="#method.split" class="fn">split</a>&lt;F&gt;(&amp;self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.Split.html" title="struct core::slice::iter::Split">Split</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over subslices separated by elements that match
<code>pred</code>. The matched element is not contained in the subslices.</p>
<h5 id="examples-98"><a class="doc-anchor" href="#examples-98">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">33</span>, <span class="number">20</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.split(|num| num % <span class="number">3 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">20</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
<p>If the first element is matched, an empty slice will be the first item
returned by the iterator. Similarly, if the last element in the slice
is matched, an empty slice will be the last item returned by the
iterator:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">33</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.split(|num| num % <span class="number">3 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
<p>If two matched elements are directly adjacent, an empty slice will be
present between them:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="number">10</span>, <span class="number">6</span>, <span class="number">33</span>, <span class="number">20</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.split(|num| num % <span class="number">3 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">10</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">20</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2202-2204">source</a></span><h4 class="code-header">pub fn <a href="#method.split_mut" class="fn">split_mut</a>&lt;F&gt;(&amp;mut self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.SplitMut.html" title="struct core::slice::iter::SplitMut">SplitMut</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over mutable subslices separated by elements that
match <code>pred</code>. The matched element is not contained in the subslices.</p>
<h5 id="examples-99"><a class="doc-anchor" href="#examples-99">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">50</span>];
<span class="kw">for </span>group <span class="kw">in </span>v.split_mut(|num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
group[<span class="number">0</span>] = <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, [<span class="number">1</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">1</span>, <span class="number">60</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_inclusive" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2238-2240">source</a></span><h4 class="code-header">pub fn <a href="#method.split_inclusive" class="fn">split_inclusive</a>&lt;F&gt;(&amp;self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.SplitInclusive.html" title="struct core::slice::iter::SplitInclusive">SplitInclusive</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over subslices separated by elements that match
<code>pred</code>. The matched element is contained in the end of the previous
subslice as a terminator.</p>
<h5 id="examples-100"><a class="doc-anchor" href="#examples-100">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">33</span>, <span class="number">20</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.split_inclusive(|num| num % <span class="number">3 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">33</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">20</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
<p>If the last element of the slice is matched,
that element will be considered the terminator of the preceding slice.
That slice will be the last item returned by the iterator.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="number">3</span>, <span class="number">10</span>, <span class="number">40</span>, <span class="number">33</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.split_inclusive(|num| num % <span class="number">3 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">3</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">33</span>]);
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_inclusive_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2262-2264">source</a></span><h4 class="code-header">pub fn <a href="#method.split_inclusive_mut" class="fn">split_inclusive_mut</a>&lt;F&gt;(&amp;mut self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.SplitInclusiveMut.html" title="struct core::slice::iter::SplitInclusiveMut">SplitInclusiveMut</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over mutable subslices separated by elements that
match <code>pred</code>. The matched element is contained in the previous
subslice as a terminator.</p>
<h5 id="examples-101"><a class="doc-anchor" href="#examples-101">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">50</span>];
<span class="kw">for </span>group <span class="kw">in </span>v.split_inclusive_mut(|num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
<span class="kw">let </span>terminator_idx = group.len()-<span class="number">1</span>;
group[terminator_idx] = <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, [<span class="number">10</span>, <span class="number">40</span>, <span class="number">1</span>, <span class="number">20</span>, <span class="number">1</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rsplit" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.27.0">1.27.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2298-2300">source</a></span><h4 class="code-header">pub fn <a href="#method.rsplit" class="fn">rsplit</a>&lt;F&gt;(&amp;self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RSplit.html" title="struct core::slice::iter::RSplit">RSplit</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over subslices separated by elements that match
<code>pred</code>, starting at the end of the slice and working backwards.
The matched element is not contained in the subslices.</p>
<h5 id="examples-102"><a class="doc-anchor" href="#examples-102">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>slice = [<span class="number">11</span>, <span class="number">22</span>, <span class="number">33</span>, <span class="number">0</span>, <span class="number">44</span>, <span class="number">55</span>];
<span class="kw">let </span><span class="kw-2">mut </span>iter = slice.rsplit(|num| <span class="kw-2">*</span>num == <span class="number">0</span>);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">44</span>, <span class="number">55</span>]);
<span class="macro">assert_eq!</span>(iter.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">11</span>, <span class="number">22</span>, <span class="number">33</span>]);
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">None</span>);</code></pre></div>
<p>As with <code>split()</code>, if the first or last element is matched, an empty
slice will be the first (or last) item returned by the iterator.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>];
<span class="kw">let </span><span class="kw-2">mut </span>it = v.rsplit(|n| <span class="kw-2">*</span>n % <span class="number">2 </span>== <span class="number">0</span>);
<span class="macro">assert_eq!</span>(it.next().unwrap(), <span class="kw-2">&amp;</span>[]);
<span class="macro">assert_eq!</span>(it.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">5</span>]);
<span class="macro">assert_eq!</span>(it.next().unwrap(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">1</span>]);
<span class="macro">assert_eq!</span>(it.next().unwrap(), <span class="kw-2">&amp;</span>[]);
<span class="macro">assert_eq!</span>(it.next(), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rsplit_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.27.0">1.27.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2324-2326">source</a></span><h4 class="code-header">pub fn <a href="#method.rsplit_mut" class="fn">rsplit_mut</a>&lt;F&gt;(&amp;mut self, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RSplitMut.html" title="struct core::slice::iter::RSplitMut">RSplitMut</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over mutable subslices separated by elements that
match <code>pred</code>, starting at the end of the slice and working
backwards. The matched element is not contained in the subslices.</p>
<h5 id="examples-103"><a class="doc-anchor" href="#examples-103">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">100</span>, <span class="number">400</span>, <span class="number">300</span>, <span class="number">200</span>, <span class="number">600</span>, <span class="number">500</span>];
<span class="kw">let </span><span class="kw-2">mut </span>count = <span class="number">0</span>;
<span class="kw">for </span>group <span class="kw">in </span>v.rsplit_mut(|num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
count += <span class="number">1</span>;
group[<span class="number">0</span>] = count;
}
<span class="macro">assert_eq!</span>(v, [<span class="number">3</span>, <span class="number">400</span>, <span class="number">300</span>, <span class="number">2</span>, <span class="number">600</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.splitn" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2352-2354">source</a></span><h4 class="code-header">pub fn <a href="#method.splitn" class="fn">splitn</a>&lt;F&gt;(&amp;self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.SplitN.html" title="struct core::slice::iter::SplitN">SplitN</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over subslices separated by elements that match
<code>pred</code>, limited to returning at most <code>n</code> items. The matched element is
not contained in the subslices.</p>
<p>The last element returned, if any, will contain the remainder of the
slice.</p>
<h5 id="examples-104"><a class="doc-anchor" href="#examples-104">§</a>Examples</h5>
<p>Print the slice split once by numbers divisible by 3 (i.e., <code>[10, 40]</code>,
<code>[20, 60, 50]</code>):</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">50</span>];
<span class="kw">for </span>group <span class="kw">in </span>v.splitn(<span class="number">2</span>, |num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
<span class="macro">println!</span>(<span class="string">"{group:?}"</span>);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.splitn_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2378-2380">source</a></span><h4 class="code-header">pub fn <a href="#method.splitn_mut" class="fn">splitn_mut</a>&lt;F&gt;(&amp;mut self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.SplitNMut.html" title="struct core::slice::iter::SplitNMut">SplitNMut</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over mutable subslices separated by elements that match
<code>pred</code>, limited to returning at most <code>n</code> items. The matched element is
not contained in the subslices.</p>
<p>The last element returned, if any, will contain the remainder of the
slice.</p>
<h5 id="examples-105"><a class="doc-anchor" href="#examples-105">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">50</span>];
<span class="kw">for </span>group <span class="kw">in </span>v.splitn_mut(<span class="number">2</span>, |num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
group[<span class="number">0</span>] = <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(v, [<span class="number">1</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">1</span>, <span class="number">60</span>, <span class="number">50</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rsplitn" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2407-2409">source</a></span><h4 class="code-header">pub fn <a href="#method.rsplitn" class="fn">rsplitn</a>&lt;F&gt;(&amp;self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RSplitN.html" title="struct core::slice::iter::RSplitN">RSplitN</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over subslices separated by elements that match
<code>pred</code> limited to returning at most <code>n</code> items. This starts at the end of
the slice and works backwards. The matched element is not contained in
the subslices.</p>
<p>The last element returned, if any, will contain the remainder of the
slice.</p>
<h5 id="examples-106"><a class="doc-anchor" href="#examples-106">§</a>Examples</h5>
<p>Print the slice split once, starting from the end, by numbers divisible
by 3 (i.e., <code>[50]</code>, <code>[10, 40, 30, 20]</code>):</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">50</span>];
<span class="kw">for </span>group <span class="kw">in </span>v.rsplitn(<span class="number">2</span>, |num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
<span class="macro">println!</span>(<span class="string">"{group:?}"</span>);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rsplitn_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2434-2436">source</a></span><h4 class="code-header">pub fn <a href="#method.rsplitn_mut" class="fn">rsplitn_mut</a>&lt;F&gt;(&amp;mut self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, pred: F) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.RSplitNMut.html" title="struct core::slice::iter::RSplitNMut">RSplitNMut</a>&lt;'_, T, F&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns an iterator over subslices separated by elements that match
<code>pred</code> limited to returning at most <code>n</code> items. This starts at the end of
the slice and works backwards. The matched element is not contained in
the subslices.</p>
<p>The last element returned, if any, will contain the remainder of the
slice.</p>
<h5 id="examples-107"><a class="doc-anchor" href="#examples-107">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>s = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">50</span>];
<span class="kw">for </span>group <span class="kw">in </span>s.rsplitn_mut(<span class="number">2</span>, |num| <span class="kw-2">*</span>num % <span class="number">3 </span>== <span class="number">0</span>) {
group[<span class="number">0</span>] = <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(s, [<span class="number">1</span>, <span class="number">40</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">60</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.split_once" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2461-2463">source</a><h4 class="code-header">pub fn <a href="#method.split_once" class="fn">split_once</a>&lt;F&gt;(&amp;self, pred: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_split_once</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice on the first element that matches the specified
predicate.</p>
<p>If any matching elements are present in the slice, returns the prefix
before the match and suffix after. The matching element itself is not
included. If no elements match, returns <code>None</code>.</p>
<h5 id="examples-108"><a class="doc-anchor" href="#examples-108">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_split_once)]
</span><span class="kw">let </span>s = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="macro">assert_eq!</span>(s.split_once(|<span class="kw-2">&amp;</span>x| x == <span class="number">2</span>), <span class="prelude-val">Some</span>((
<span class="kw-2">&amp;</span>[<span class="number">1</span>][..],
<span class="kw-2">&amp;</span>[<span class="number">3</span>, <span class="number">2</span>, <span class="number">4</span>][..]
)));
<span class="macro">assert_eq!</span>(s.split_once(|<span class="kw-2">&amp;</span>x| x == <span class="number">0</span>), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rsplit_once" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2489-2491">source</a><h4 class="code-header">pub fn <a href="#method.rsplit_once" class="fn">rsplit_once</a>&lt;F&gt;(&amp;self, pred: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;(&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_split_once</code>)</span></div></span></summary><div class="docblock"><p>Splits the slice on the last element that matches the specified
predicate.</p>
<p>If any matching elements are present in the slice, returns the prefix
before the match and suffix after. The matching element itself is not
included. If no elements match, returns <code>None</code>.</p>
<h5 id="examples-109"><a class="doc-anchor" href="#examples-109">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_split_once)]
</span><span class="kw">let </span>s = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="macro">assert_eq!</span>(s.rsplit_once(|<span class="kw-2">&amp;</span>x| x == <span class="number">2</span>), <span class="prelude-val">Some</span>((
<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>][..],
<span class="kw-2">&amp;</span>[<span class="number">4</span>][..]
)));
<span class="macro">assert_eq!</span>(s.rsplit_once(|<span class="kw-2">&amp;</span>x| x == <span class="number">0</span>), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.contains" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2525-2527">source</a></span><h4 class="code-header">pub fn <a href="#method.contains" class="fn">contains</a>(&amp;self, x: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if the slice contains an element with the given value.</p>
<p>This operation is <em>O</em>(<em>n</em>).</p>
<p>Note that if you have a sorted slice, <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search" title="method slice::binary_search"><code>binary_search</code></a> may be faster.</p>
<h5 id="examples-110"><a class="doc-anchor" href="#examples-110">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert!</span>(v.contains(<span class="kw-2">&amp;</span><span class="number">30</span>));
<span class="macro">assert!</span>(!v.contains(<span class="kw-2">&amp;</span><span class="number">50</span>));</code></pre></div>
<p>If you do not have a <code>&amp;T</code>, but some other value that you can compare
with one (for example, <code>String</code> implements <code>PartialEq&lt;str&gt;</code>), you can
use <code>iter().any</code>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [String::from(<span class="string">"hello"</span>), String::from(<span class="string">"world"</span>)]; <span class="comment">// slice of `String`
</span><span class="macro">assert!</span>(v.iter().any(|e| e == <span class="string">"hello"</span>)); <span class="comment">// search with `&amp;str`
</span><span class="macro">assert!</span>(!v.iter().any(|e| e == <span class="string">"hi"</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.starts_with" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2555-2557">source</a></span><h4 class="code-header">pub fn <a href="#method.starts_with" class="fn">starts_with</a>(&amp;self, needle: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if <code>needle</code> is a prefix of the slice or equal to the slice.</p>
<h5 id="examples-111"><a class="doc-anchor" href="#examples-111">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&amp;</span>[<span class="number">10</span>]));
<span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>]));
<span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&amp;</span>v));
<span class="macro">assert!</span>(!v.starts_with(<span class="kw-2">&amp;</span>[<span class="number">50</span>]));
<span class="macro">assert!</span>(!v.starts_with(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">50</span>]));</code></pre></div>
<p>Always returns <code>true</code> if <code>needle</code> is an empty slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&amp;</span>[]));
<span class="kw">let </span>v: <span class="kw-2">&amp;</span>[u8] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&amp;</span>[]));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.ends_with" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2586-2588">source</a></span><h4 class="code-header">pub fn <a href="#method.ends_with" class="fn">ends_with</a>(&amp;self, needle: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section></summary><div class="docblock"><p>Returns <code>true</code> if <code>needle</code> is a suffix of the slice or equal to the slice.</p>
<h5 id="examples-112"><a class="doc-anchor" href="#examples-112">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&amp;</span>[<span class="number">30</span>]));
<span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&amp;</span>[<span class="number">40</span>, <span class="number">30</span>]));
<span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&amp;</span>v));
<span class="macro">assert!</span>(!v.ends_with(<span class="kw-2">&amp;</span>[<span class="number">50</span>]));
<span class="macro">assert!</span>(!v.ends_with(<span class="kw-2">&amp;</span>[<span class="number">50</span>, <span class="number">30</span>]));</code></pre></div>
<p>Always returns <code>true</code> if <code>needle</code> is an empty slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&amp;</span>[]));
<span class="kw">let </span>v: <span class="kw-2">&amp;</span>[u8] = <span class="kw-2">&amp;</span>[];
<span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&amp;</span>[]));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.strip_prefix" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2618-2620">source</a></span><h4 class="code-header">pub fn <a href="#method.strip_prefix" class="fn">strip_prefix</a>&lt;P&gt;(&amp;self, prefix: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;P</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;<div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/trait.SlicePattern.html" title="trait core::slice::SlicePattern">SlicePattern</a>&lt;Item = T&gt; + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section></summary><div class="docblock"><p>Returns a subslice with the prefix removed.</p>
<p>If the slice starts with <code>prefix</code>, returns the subslice after the prefix, wrapped in <code>Some</code>.
If <code>prefix</code> is empty, simply returns the original slice. If <code>prefix</code> is equal to the
original slice, returns an empty slice.</p>
<p>If the slice does not start with <code>prefix</code>, returns <code>None</code>.</p>
<h5 id="examples-113"><a class="doc-anchor" href="#examples-113">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(v.strip_prefix(<span class="kw-2">&amp;</span>[<span class="number">10</span>]), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">40</span>, <span class="number">30</span>][..]));
<span class="macro">assert_eq!</span>(v.strip_prefix(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>]), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">30</span>][..]));
<span class="macro">assert_eq!</span>(v.strip_prefix(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>]), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[][..]));
<span class="macro">assert_eq!</span>(v.strip_prefix(<span class="kw-2">&amp;</span>[<span class="number">50</span>]), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(v.strip_prefix(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">50</span>]), <span class="prelude-val">None</span>);
<span class="kw">let </span>prefix : <span class="kw-2">&amp;</span>str = <span class="string">"he"</span>;
<span class="macro">assert_eq!</span>(<span class="string">b"hello"</span>.strip_prefix(prefix.as_bytes()),
<span class="prelude-val">Some</span>(<span class="string">b"llo"</span>.as_ref()));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.strip_suffix" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2654-2656">source</a></span><h4 class="code-header">pub fn <a href="#method.strip_suffix" class="fn">strip_suffix</a>&lt;P&gt;(&amp;self, suffix: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;P</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;<div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/slice/trait.SlicePattern.html" title="trait core::slice::SlicePattern">SlicePattern</a>&lt;Item = T&gt; + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section></summary><div class="docblock"><p>Returns a subslice with the suffix removed.</p>
<p>If the slice ends with <code>suffix</code>, returns the subslice before the suffix, wrapped in <code>Some</code>.
If <code>suffix</code> is empty, simply returns the original slice. If <code>suffix</code> is equal to the
original slice, returns an empty slice.</p>
<p>If the slice does not end with <code>suffix</code>, returns <code>None</code>.</p>
<h5 id="examples-114"><a class="doc-anchor" href="#examples-114">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="macro">assert_eq!</span>(v.strip_suffix(<span class="kw-2">&amp;</span>[<span class="number">30</span>]), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>][..]));
<span class="macro">assert_eq!</span>(v.strip_suffix(<span class="kw-2">&amp;</span>[<span class="number">40</span>, <span class="number">30</span>]), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[<span class="number">10</span>][..]));
<span class="macro">assert_eq!</span>(v.strip_suffix(<span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>]), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>[][..]));
<span class="macro">assert_eq!</span>(v.strip_suffix(<span class="kw-2">&amp;</span>[<span class="number">50</span>]), <span class="prelude-val">None</span>);
<span class="macro">assert_eq!</span>(v.strip_suffix(<span class="kw-2">&amp;</span>[<span class="number">50</span>, <span class="number">30</span>]), <span class="prelude-val">None</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.binary_search" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2740-2742">source</a></span><h4 class="code-header">pub fn <a href="#method.binary_search" class="fn">binary_search</a>(&amp;self, x: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Binary searches this slice for a given element.
If the slice is not sorted, the returned result is unspecified and
meaningless.</p>
<p>If the value is found then <a href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html#variant.Ok" title="variant core::result::Result::Ok"><code>Result::Ok</code></a> is returned, containing the
index of the matching element. If there are multiple matches, then any
one of the matches could be returned. The index is chosen
deterministically, but is subject to change in future versions of Rust.
If the value is not found then <a href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html#variant.Err" title="variant core::result::Result::Err"><code>Result::Err</code></a> is returned, containing
the index where a matching element could be inserted while maintaining
sorted order.</p>
<p>See also <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search_by" title="method slice::binary_search_by"><code>binary_search_by</code></a>, <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search_by_key" title="method slice::binary_search_by_key"><code>binary_search_by_key</code></a>, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.partition_point" title="method slice::partition_point"><code>partition_point</code></a>.</p>
<h5 id="examples-115"><a class="doc-anchor" href="#examples-115">§</a>Examples</h5>
<p>Looks up a series of four elements. The first is found, with a
uniquely determined position; the second and third are not
found; the fourth could match any position in <code>[1, 4]</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>s = [<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">55</span>];
<span class="macro">assert_eq!</span>(s.binary_search(<span class="kw-2">&amp;</span><span class="number">13</span>), <span class="prelude-val">Ok</span>(<span class="number">9</span>));
<span class="macro">assert_eq!</span>(s.binary_search(<span class="kw-2">&amp;</span><span class="number">4</span>), <span class="prelude-val">Err</span>(<span class="number">7</span>));
<span class="macro">assert_eq!</span>(s.binary_search(<span class="kw-2">&amp;</span><span class="number">100</span>), <span class="prelude-val">Err</span>(<span class="number">13</span>));
<span class="kw">let </span>r = s.binary_search(<span class="kw-2">&amp;</span><span class="number">1</span>);
<span class="macro">assert!</span>(<span class="kw">match </span>r { <span class="prelude-val">Ok</span>(<span class="number">1</span>..=<span class="number">4</span>) =&gt; <span class="bool-val">true</span>, <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>, });</code></pre></div>
<p>If you want to find that whole <em>range</em> of matching items, rather than
an arbitrary matching one, that can be done using <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.partition_point" title="method slice::partition_point"><code>partition_point</code></a>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>s = [<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">55</span>];
<span class="kw">let </span>low = s.partition_point(|x| x &lt; <span class="kw-2">&amp;</span><span class="number">1</span>);
<span class="macro">assert_eq!</span>(low, <span class="number">1</span>);
<span class="kw">let </span>high = s.partition_point(|x| x &lt;= <span class="kw-2">&amp;</span><span class="number">1</span>);
<span class="macro">assert_eq!</span>(high, <span class="number">5</span>);
<span class="kw">let </span>r = s.binary_search(<span class="kw-2">&amp;</span><span class="number">1</span>);
<span class="macro">assert!</span>((low..high).contains(<span class="kw-2">&amp;</span>r.unwrap()));
<span class="macro">assert!</span>(s[..low].iter().all(|<span class="kw-2">&amp;</span>x| x &lt; <span class="number">1</span>));
<span class="macro">assert!</span>(s[low..high].iter().all(|<span class="kw-2">&amp;</span>x| x == <span class="number">1</span>));
<span class="macro">assert!</span>(s[high..].iter().all(|<span class="kw-2">&amp;</span>x| x &gt; <span class="number">1</span>));
<span class="comment">// For something not found, the "range" of equal items is empty
</span><span class="macro">assert_eq!</span>(s.partition_point(|x| x &lt; <span class="kw-2">&amp;</span><span class="number">11</span>), <span class="number">9</span>);
<span class="macro">assert_eq!</span>(s.partition_point(|x| x &lt;= <span class="kw-2">&amp;</span><span class="number">11</span>), <span class="number">9</span>);
<span class="macro">assert_eq!</span>(s.binary_search(<span class="kw-2">&amp;</span><span class="number">11</span>), <span class="prelude-val">Err</span>(<span class="number">9</span>));</code></pre></div>
<p>If you want to insert an item to a sorted vector, while maintaining
sort order, consider using <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.partition_point" title="method slice::partition_point"><code>partition_point</code></a>:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>s = <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">55</span>];
<span class="kw">let </span>num = <span class="number">42</span>;
<span class="kw">let </span>idx = s.partition_point(|<span class="kw-2">&amp;</span>x| x &lt;= num);
<span class="comment">// If `num` is unique, `s.partition_point(|&amp;x| x &lt; num)` (with `&lt;`) is equivalent to
// `s.binary_search(&amp;num).unwrap_or_else(|x| x)`, but using `&lt;=` will allow `insert`
// to shift less elements.
</span>s.insert(idx, num);
<span class="macro">assert_eq!</span>(s, [<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">42</span>, <span class="number">55</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.binary_search_by" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2791-2793">source</a></span><h4 class="code-header">pub fn <a href="#method.binary_search_by" class="fn">binary_search_by</a>&lt;'a, F&gt;(&amp;'a self, f: F) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Binary searches this slice with a comparator function.</p>
<p>The comparator function should return an order code that indicates
whether its argument is <code>Less</code>, <code>Equal</code> or <code>Greater</code> the desired
target.
If the slice is not sorted or if the comparator function does not
implement an order consistent with the sort order of the underlying
slice, the returned result is unspecified and meaningless.</p>
<p>If the value is found then <a href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html#variant.Ok" title="variant core::result::Result::Ok"><code>Result::Ok</code></a> is returned, containing the
index of the matching element. If there are multiple matches, then any
one of the matches could be returned. The index is chosen
deterministically, but is subject to change in future versions of Rust.
If the value is not found then <a href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html#variant.Err" title="variant core::result::Result::Err"><code>Result::Err</code></a> is returned, containing
the index where a matching element could be inserted while maintaining
sorted order.</p>
<p>See also <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search" title="method slice::binary_search"><code>binary_search</code></a>, <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search_by_key" title="method slice::binary_search_by_key"><code>binary_search_by_key</code></a>, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.partition_point" title="method slice::partition_point"><code>partition_point</code></a>.</p>
<h5 id="examples-116"><a class="doc-anchor" href="#examples-116">§</a>Examples</h5>
<p>Looks up a series of four elements. The first is found, with a
uniquely determined position; the second and third are not
found; the fourth could match any position in <code>[1, 4]</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>s = [<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">55</span>];
<span class="kw">let </span>seek = <span class="number">13</span>;
<span class="macro">assert_eq!</span>(s.binary_search_by(|probe| probe.cmp(<span class="kw-2">&amp;</span>seek)), <span class="prelude-val">Ok</span>(<span class="number">9</span>));
<span class="kw">let </span>seek = <span class="number">4</span>;
<span class="macro">assert_eq!</span>(s.binary_search_by(|probe| probe.cmp(<span class="kw-2">&amp;</span>seek)), <span class="prelude-val">Err</span>(<span class="number">7</span>));
<span class="kw">let </span>seek = <span class="number">100</span>;
<span class="macro">assert_eq!</span>(s.binary_search_by(|probe| probe.cmp(<span class="kw-2">&amp;</span>seek)), <span class="prelude-val">Err</span>(<span class="number">13</span>));
<span class="kw">let </span>seek = <span class="number">1</span>;
<span class="kw">let </span>r = s.binary_search_by(|probe| probe.cmp(<span class="kw-2">&amp;</span>seek));
<span class="macro">assert!</span>(<span class="kw">match </span>r { <span class="prelude-val">Ok</span>(<span class="number">1</span>..=<span class="number">4</span>) =&gt; <span class="bool-val">true</span>, <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>, });</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.binary_search_by_key" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.10.0">1.10.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2879-2882">source</a></span><h4 class="code-header">pub fn <a href="#method.binary_search_by_key" class="fn">binary_search_by_key</a>&lt;'a, B, F&gt;(
&amp;'a self,
b: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;B</a>,
f: F
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>) -&gt; B,
B: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Binary searches this slice with a key extraction function.</p>
<p>Assumes that the slice is sorted by the key, for instance with
<a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key" title="method slice::sort_by_key"><code>sort_by_key</code></a> using the same key extraction function.
If the slice is not sorted by the key, the returned result is
unspecified and meaningless.</p>
<p>If the value is found then <a href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html#variant.Ok" title="variant core::result::Result::Ok"><code>Result::Ok</code></a> is returned, containing the
index of the matching element. If there are multiple matches, then any
one of the matches could be returned. The index is chosen
deterministically, but is subject to change in future versions of Rust.
If the value is not found then <a href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html#variant.Err" title="variant core::result::Result::Err"><code>Result::Err</code></a> is returned, containing
the index where a matching element could be inserted while maintaining
sorted order.</p>
<p>See also <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search" title="method slice::binary_search"><code>binary_search</code></a>, <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search_by" title="method slice::binary_search_by"><code>binary_search_by</code></a>, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.partition_point" title="method slice::partition_point"><code>partition_point</code></a>.</p>
<h5 id="examples-117"><a class="doc-anchor" href="#examples-117">§</a>Examples</h5>
<p>Looks up a series of four elements in a slice of pairs sorted by
their second elements. The first is found, with a uniquely
determined position; the second and third are not found; the
fourth could match any position in <code>[1, 4]</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>s = [(<span class="number">0</span>, <span class="number">0</span>), (<span class="number">2</span>, <span class="number">1</span>), (<span class="number">4</span>, <span class="number">1</span>), (<span class="number">5</span>, <span class="number">1</span>), (<span class="number">3</span>, <span class="number">1</span>),
(<span class="number">1</span>, <span class="number">2</span>), (<span class="number">2</span>, <span class="number">3</span>), (<span class="number">4</span>, <span class="number">5</span>), (<span class="number">5</span>, <span class="number">8</span>), (<span class="number">3</span>, <span class="number">13</span>),
(<span class="number">1</span>, <span class="number">21</span>), (<span class="number">2</span>, <span class="number">34</span>), (<span class="number">4</span>, <span class="number">55</span>)];
<span class="macro">assert_eq!</span>(s.binary_search_by_key(<span class="kw-2">&amp;</span><span class="number">13</span>, |<span class="kw-2">&amp;</span>(a, b)| b), <span class="prelude-val">Ok</span>(<span class="number">9</span>));
<span class="macro">assert_eq!</span>(s.binary_search_by_key(<span class="kw-2">&amp;</span><span class="number">4</span>, |<span class="kw-2">&amp;</span>(a, b)| b), <span class="prelude-val">Err</span>(<span class="number">7</span>));
<span class="macro">assert_eq!</span>(s.binary_search_by_key(<span class="kw-2">&amp;</span><span class="number">100</span>, |<span class="kw-2">&amp;</span>(a, b)| b), <span class="prelude-val">Err</span>(<span class="number">13</span>));
<span class="kw">let </span>r = s.binary_search_by_key(<span class="kw-2">&amp;</span><span class="number">1</span>, |<span class="kw-2">&amp;</span>(a, b)| b);
<span class="macro">assert!</span>(<span class="kw">match </span>r { <span class="prelude-val">Ok</span>(<span class="number">1</span>..=<span class="number">4</span>) =&gt; <span class="bool-val">true</span>, <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>, });</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_unstable" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.20.0">1.20.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2915-2917">source</a></span><h4 class="code-header">pub fn <a href="#method.sort_unstable" class="fn">sort_unstable</a>(&amp;mut self)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Sorts the slice, but might not preserve the order of equal elements.</p>
<p>This sort is unstable (i.e., may reorder equal elements), in-place
(i.e., does not allocate), and <em>O</em>(<em>n</em> * log(<em>n</em>)) worst-case.</p>
<h5 id="current-implementation-1"><a class="doc-anchor" href="#current-implementation-1">§</a>Current implementation</h5>
<p>The current algorithm is based on <a href="https://github.com/orlp/pdqsort">pattern-defeating quicksort</a> by Orson Peters,
which combines the fast average case of randomized quicksort with the fast worst case of
heapsort, while achieving linear time on slices with certain patterns. It uses some
randomization to avoid degenerate cases, but with a fixed seed to always provide
deterministic behavior.</p>
<p>It is typically faster than stable sorting, except in a few special cases, e.g., when the
slice consists of several concatenated sorted sequences.</p>
<h5 id="examples-118"><a class="doc-anchor" href="#examples-118">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">3</span>, <span class="number">2</span>];
v.sort_unstable();
<span class="macro">assert!</span>(v == [-<span class="number">5</span>, -<span class="number">3</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_unstable_by" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.20.0">1.20.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#2970-2972">source</a></span><h4 class="code-header">pub fn <a href="#method.sort_unstable_by" class="fn">sort_unstable_by</a>&lt;F&gt;(&amp;mut self, compare: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Sorts the slice with a comparator function, but might not preserve the order of equal
elements.</p>
<p>This sort is unstable (i.e., may reorder equal elements), in-place
(i.e., does not allocate), and <em>O</em>(<em>n</em> * log(<em>n</em>)) worst-case.</p>
<p>The comparator function must define a total ordering for the elements in the slice. If
the ordering is not total, the order of the elements is unspecified. An order is a
total order if it is (for all <code>a</code>, <code>b</code> and <code>c</code>):</p>
<ul>
<li>total and antisymmetric: exactly one of <code>a &lt; b</code>, <code>a == b</code> or <code>a &gt; b</code> is true, and</li>
<li>transitive, <code>a &lt; b</code> and <code>b &lt; c</code> implies <code>a &lt; c</code>. The same must hold for both <code>==</code> and <code>&gt;</code>.</li>
</ul>
<p>For example, while <a href="https://doc.rust-lang.org/nightly/std/primitive.f64.html" title="primitive f64"><code>f64</code></a> doesn’t implement <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord"><code>Ord</code></a> because <code>NaN != NaN</code>, we can use
<code>partial_cmp</code> as our sort function when we know the slice doesn’t contain a <code>NaN</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>floats = [<span class="number">5f64</span>, <span class="number">4.0</span>, <span class="number">1.0</span>, <span class="number">3.0</span>, <span class="number">2.0</span>];
floats.sort_unstable_by(|a, b| a.partial_cmp(b).unwrap());
<span class="macro">assert_eq!</span>(floats, [<span class="number">1.0</span>, <span class="number">2.0</span>, <span class="number">3.0</span>, <span class="number">4.0</span>, <span class="number">5.0</span>]);</code></pre></div>
<h5 id="current-implementation-2"><a class="doc-anchor" href="#current-implementation-2">§</a>Current implementation</h5>
<p>The current algorithm is based on <a href="https://github.com/orlp/pdqsort">pattern-defeating quicksort</a> by Orson Peters,
which combines the fast average case of randomized quicksort with the fast worst case of
heapsort, while achieving linear time on slices with certain patterns. It uses some
randomization to avoid degenerate cases, but with a fixed seed to always provide
deterministic behavior.</p>
<p>It is typically faster than stable sorting, except in a few special cases, e.g., when the
slice consists of several concatenated sorted sequences.</p>
<h5 id="examples-119"><a class="doc-anchor" href="#examples-119">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">5</span>, <span class="number">4</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">2</span>];
v.sort_unstable_by(|a, b| a.cmp(b));
<span class="macro">assert!</span>(v == [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);
<span class="comment">// reverse sorting
</span>v.sort_unstable_by(|a, b| b.cmp(a));
<span class="macro">assert!</span>(v == [<span class="number">5</span>, <span class="number">4</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_unstable_by_key" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.20.0">1.20.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3008-3011">source</a></span><h4 class="code-header">pub fn <a href="#method.sort_unstable_by_key" class="fn">sort_unstable_by_key</a>&lt;K, F&gt;(&amp;mut self, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Sorts the slice with a key extraction function, but might not preserve the order of equal
elements.</p>
<p>This sort is unstable (i.e., may reorder equal elements), in-place
(i.e., does not allocate), and <em>O</em>(<em>m</em> * <em>n</em> * log(<em>n</em>)) worst-case, where the key function is
<em>O</em>(<em>m</em>).</p>
<h5 id="current-implementation-3"><a class="doc-anchor" href="#current-implementation-3">§</a>Current implementation</h5>
<p>The current algorithm is based on <a href="https://github.com/orlp/pdqsort">pattern-defeating quicksort</a> by Orson Peters,
which combines the fast average case of randomized quicksort with the fast worst case of
heapsort, while achieving linear time on slices with certain patterns. It uses some
randomization to avoid degenerate cases, but with a fixed seed to always provide
deterministic behavior.</p>
<p>Due to its key calling strategy, <a href="#method.sort_unstable_by_key"><code>sort_unstable_by_key</code></a>
is likely to be slower than <a href="#method.sort_by_cached_key"><code>sort_by_cached_key</code></a> in
cases where the key function is expensive.</p>
<h5 id="examples-120"><a class="doc-anchor" href="#examples-120">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5i32</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">3</span>, <span class="number">2</span>];
v.sort_unstable_by_key(|k| k.abs());
<span class="macro">assert!</span>(v == [<span class="number">1</span>, <span class="number">2</span>, -<span class="number">3</span>, <span class="number">4</span>, -<span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.select_nth_unstable" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.49.0">1.49.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3063-3065">source</a></span><h4 class="code-header">pub fn <a href="#method.select_nth_unstable" class="fn">select_nth_unstable</a>(
&amp;mut self,
index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>
) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Reorder the slice such that the element at <code>index</code> after the reordering is at its final sorted position.</p>
<p>This reordering has the additional property that any value at position <code>i &lt; index</code> will be
less than or equal to any value at a position <code>j &gt; index</code>. Additionally, this reordering is
unstable (i.e. any number of equal elements may end up at position <code>index</code>), in-place
(i.e. does not allocate), and runs in <em>O</em>(<em>n</em>) time.
This function is also known as “kth element” in other libraries.</p>
<p>It returns a triplet of the following from the reordered slice:
the subslice prior to <code>index</code>, the element at <code>index</code>, and the subslice after <code>index</code>;
accordingly, the values in those two subslices will respectively all be less-than-or-equal-to
and greater-than-or-equal-to the value of the element at <code>index</code>.</p>
<h5 id="current-implementation-4"><a class="doc-anchor" href="#current-implementation-4">§</a>Current implementation</h5>
<p>The current algorithm is an introselect implementation based on Pattern Defeating Quicksort, which is also
the basis for <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable" title="method slice::sort_unstable"><code>sort_unstable</code></a>. The fallback algorithm is Median of Medians using Tukey’s Ninther for
pivot selection, which guarantees linear runtime for all inputs.</p>
<h5 id="panics-32"><a class="doc-anchor" href="#panics-32">§</a>Panics</h5>
<p>Panics when <code>index &gt;= len()</code>, meaning it always panics on empty slices.</p>
<h5 id="examples-121"><a class="doc-anchor" href="#examples-121">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5i32</span>, <span class="number">4</span>, <span class="number">2</span>, -<span class="number">3</span>, <span class="number">1</span>];
<span class="comment">// Find the items less than or equal to the median, the median, and greater than or equal to
// the median.
</span><span class="kw">let </span>(lesser, median, greater) = v.select_nth_unstable(<span class="number">2</span>);
<span class="macro">assert!</span>(lesser == [-<span class="number">3</span>, -<span class="number">5</span>] || lesser == [-<span class="number">5</span>, -<span class="number">3</span>]);
<span class="macro">assert_eq!</span>(median, <span class="kw-2">&amp;mut </span><span class="number">1</span>);
<span class="macro">assert!</span>(greater == [<span class="number">4</span>, <span class="number">2</span>] || greater == [<span class="number">2</span>, <span class="number">4</span>]);
<span class="comment">// We are only guaranteed the slice will be one of the following, based on the way we sort
// about the specified index.
</span><span class="macro">assert!</span>(v == [-<span class="number">3</span>, -<span class="number">5</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>] ||
v == [-<span class="number">5</span>, -<span class="number">3</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>] ||
v == [-<span class="number">3</span>, -<span class="number">5</span>, <span class="number">1</span>, <span class="number">4</span>, <span class="number">2</span>] ||
v == [-<span class="number">5</span>, -<span class="number">3</span>, <span class="number">1</span>, <span class="number">4</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.select_nth_unstable_by" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.49.0">1.49.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3119-3125">source</a></span><h4 class="code-header">pub fn <a href="#method.select_nth_unstable_by" class="fn">select_nth_unstable_by</a>&lt;F&gt;(
&amp;mut self,
index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>,
compare: F
) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section></summary><div class="docblock"><p>Reorder the slice with a comparator function such that the element at <code>index</code> after the reordering is at
its final sorted position.</p>
<p>This reordering has the additional property that any value at position <code>i &lt; index</code> will be
less than or equal to any value at a position <code>j &gt; index</code> using the comparator function.
Additionally, this reordering is unstable (i.e. any number of equal elements may end up at
position <code>index</code>), in-place (i.e. does not allocate), and runs in <em>O</em>(<em>n</em>) time.
This function is also known as “kth element” in other libraries.</p>
<p>It returns a triplet of the following from
the slice reordered according to the provided comparator function: the subslice prior to
<code>index</code>, the element at <code>index</code>, and the subslice after <code>index</code>; accordingly, the values in
those two subslices will respectively all be less-than-or-equal-to and greater-than-or-equal-to
the value of the element at <code>index</code>.</p>
<h5 id="current-implementation-5"><a class="doc-anchor" href="#current-implementation-5">§</a>Current implementation</h5>
<p>The current algorithm is an introselect implementation based on Pattern Defeating Quicksort, which is also
the basis for <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable" title="method slice::sort_unstable"><code>sort_unstable</code></a>. The fallback algorithm is Median of Medians using Tukey’s Ninther for
pivot selection, which guarantees linear runtime for all inputs.</p>
<h5 id="panics-33"><a class="doc-anchor" href="#panics-33">§</a>Panics</h5>
<p>Panics when <code>index &gt;= len()</code>, meaning it always panics on empty slices.</p>
<h5 id="examples-122"><a class="doc-anchor" href="#examples-122">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5i32</span>, <span class="number">4</span>, <span class="number">2</span>, -<span class="number">3</span>, <span class="number">1</span>];
<span class="comment">// Find the items less than or equal to the median, the median, and greater than or equal to
// the median as if the slice were sorted in descending order.
</span><span class="kw">let </span>(lesser, median, greater) = v.select_nth_unstable_by(<span class="number">2</span>, |a, b| b.cmp(a));
<span class="macro">assert!</span>(lesser == [<span class="number">4</span>, <span class="number">2</span>] || lesser == [<span class="number">2</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(median, <span class="kw-2">&amp;mut </span><span class="number">1</span>);
<span class="macro">assert!</span>(greater == [-<span class="number">3</span>, -<span class="number">5</span>] || greater == [-<span class="number">5</span>, -<span class="number">3</span>]);
<span class="comment">// We are only guaranteed the slice will be one of the following, based on the way we sort
// about the specified index.
</span><span class="macro">assert!</span>(v == [<span class="number">2</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">5</span>, -<span class="number">3</span>] ||
v == [<span class="number">2</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">3</span>, -<span class="number">5</span>] ||
v == [<span class="number">4</span>, <span class="number">2</span>, <span class="number">1</span>, -<span class="number">5</span>, -<span class="number">3</span>] ||
v == [<span class="number">4</span>, <span class="number">2</span>, <span class="number">1</span>, -<span class="number">3</span>, -<span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.select_nth_unstable_by_key" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.49.0">1.49.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3179-3186">source</a></span><h4 class="code-header">pub fn <a href="#method.select_nth_unstable_by_key" class="fn">select_nth_unstable_by_key</a>&lt;K, F&gt;(
&amp;mut self,
index: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>,
f: F
) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section></summary><div class="docblock"><p>Reorder the slice with a key extraction function such that the element at <code>index</code> after the reordering is
at its final sorted position.</p>
<p>This reordering has the additional property that any value at position <code>i &lt; index</code> will be
less than or equal to any value at a position <code>j &gt; index</code> using the key extraction function.
Additionally, this reordering is unstable (i.e. any number of equal elements may end up at
position <code>index</code>), in-place (i.e. does not allocate), and runs in <em>O</em>(<em>n</em>) time.
This function is also known as “kth element” in other libraries.</p>
<p>It returns a triplet of the following from
the slice reordered according to the provided key extraction function: the subslice prior to
<code>index</code>, the element at <code>index</code>, and the subslice after <code>index</code>; accordingly, the values in
those two subslices will respectively all be less-than-or-equal-to and greater-than-or-equal-to
the value of the element at <code>index</code>.</p>
<h5 id="current-implementation-6"><a class="doc-anchor" href="#current-implementation-6">§</a>Current implementation</h5>
<p>The current algorithm is an introselect implementation based on Pattern Defeating Quicksort, which is also
the basis for <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable" title="method slice::sort_unstable"><code>sort_unstable</code></a>. The fallback algorithm is Median of Medians using Tukey’s Ninther for
pivot selection, which guarantees linear runtime for all inputs.</p>
<h5 id="panics-34"><a class="doc-anchor" href="#panics-34">§</a>Panics</h5>
<p>Panics when <code>index &gt;= len()</code>, meaning it always panics on empty slices.</p>
<h5 id="examples-123"><a class="doc-anchor" href="#examples-123">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5i32</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">3</span>, <span class="number">2</span>];
<span class="comment">// Find the items less than or equal to the median, the median, and greater than or equal to
// the median as if the slice were sorted according to absolute value.
</span><span class="kw">let </span>(lesser, median, greater) = v.select_nth_unstable_by_key(<span class="number">2</span>, |a| a.abs());
<span class="macro">assert!</span>(lesser == [<span class="number">1</span>, <span class="number">2</span>] || lesser == [<span class="number">2</span>, <span class="number">1</span>]);
<span class="macro">assert_eq!</span>(median, <span class="kw-2">&amp;mut </span>-<span class="number">3</span>);
<span class="macro">assert!</span>(greater == [<span class="number">4</span>, -<span class="number">5</span>] || greater == [-<span class="number">5</span>, <span class="number">4</span>]);
<span class="comment">// We are only guaranteed the slice will be one of the following, based on the way we sort
// about the specified index.
</span><span class="macro">assert!</span>(v == [<span class="number">1</span>, <span class="number">2</span>, -<span class="number">3</span>, <span class="number">4</span>, -<span class="number">5</span>] ||
v == [<span class="number">1</span>, <span class="number">2</span>, -<span class="number">3</span>, -<span class="number">5</span>, <span class="number">4</span>] ||
v == [<span class="number">2</span>, <span class="number">1</span>, -<span class="number">3</span>, <span class="number">4</span>, -<span class="number">5</span>] ||
v == [<span class="number">2</span>, <span class="number">1</span>, -<span class="number">3</span>, -<span class="number">5</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.partition_dedup" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3213-3215">source</a><h4 class="code-header">pub fn <a href="#method.partition_dedup" class="fn">partition_dedup</a>(&amp;mut self) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_partition_dedup</code>)</span></div></span></summary><div class="docblock"><p>Moves all consecutive repeated elements to the end of the slice according to the
<a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq"><code>PartialEq</code></a> trait implementation.</p>
<p>Returns two slices. The first contains no consecutive repeated elements.
The second contains all the duplicates in no specified order.</p>
<p>If the slice is sorted, the first returned slice contains no duplicates.</p>
<h5 id="examples-124"><a class="doc-anchor" href="#examples-124">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_partition_dedup)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">1</span>];
<span class="kw">let </span>(dedup, duplicates) = slice.partition_dedup();
<span class="macro">assert_eq!</span>(dedup, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>]);
<span class="macro">assert_eq!</span>(duplicates, [<span class="number">2</span>, <span class="number">3</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.partition_dedup_by" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3247-3249">source</a><h4 class="code-header">pub fn <a href="#method.partition_dedup_by" class="fn">partition_dedup_by</a>&lt;F&gt;(&amp;mut self, same_bucket: F) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_partition_dedup</code>)</span></div></span></summary><div class="docblock"><p>Moves all but the first of consecutive elements to the end of the slice satisfying
a given equality relation.</p>
<p>Returns two slices. The first contains no consecutive repeated elements.
The second contains all the duplicates in no specified order.</p>
<p>The <code>same_bucket</code> function is passed references to two elements from the slice and
must determine if the elements compare equal. The elements are passed in opposite order
from their order in the slice, so if <code>same_bucket(a, b)</code> returns <code>true</code>, <code>a</code> is moved
at the end of the slice.</p>
<p>If the slice is sorted, the first returned slice contains no duplicates.</p>
<h5 id="examples-125"><a class="doc-anchor" href="#examples-125">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_partition_dedup)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="string">"foo"</span>, <span class="string">"Foo"</span>, <span class="string">"BAZ"</span>, <span class="string">"Bar"</span>, <span class="string">"bar"</span>, <span class="string">"baz"</span>, <span class="string">"BAZ"</span>];
<span class="kw">let </span>(dedup, duplicates) = slice.partition_dedup_by(|a, b| a.eq_ignore_ascii_case(b));
<span class="macro">assert_eq!</span>(dedup, [<span class="string">"foo"</span>, <span class="string">"BAZ"</span>, <span class="string">"Bar"</span>, <span class="string">"baz"</span>]);
<span class="macro">assert_eq!</span>(duplicates, [<span class="string">"bar"</span>, <span class="string">"Foo"</span>, <span class="string">"BAZ"</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.partition_dedup_by_key" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3373-3376">source</a><h4 class="code-header">pub fn <a href="#method.partition_dedup_by_key" class="fn">partition_dedup_by_key</a>&lt;K, F&gt;(&amp;mut self, key: F) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_partition_dedup</code>)</span></div></span></summary><div class="docblock"><p>Moves all but the first of consecutive elements to the end of the slice that resolve
to the same key.</p>
<p>Returns two slices. The first contains no consecutive repeated elements.
The second contains all the duplicates in no specified order.</p>
<p>If the slice is sorted, the first returned slice contains no duplicates.</p>
<h5 id="examples-126"><a class="doc-anchor" href="#examples-126">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_partition_dedup)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">10</span>, <span class="number">20</span>, <span class="number">21</span>, <span class="number">30</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">11</span>, <span class="number">13</span>];
<span class="kw">let </span>(dedup, duplicates) = slice.partition_dedup_by_key(|i| <span class="kw-2">*</span>i / <span class="number">10</span>);
<span class="macro">assert_eq!</span>(dedup, [<span class="number">10</span>, <span class="number">20</span>, <span class="number">30</span>, <span class="number">20</span>, <span class="number">11</span>]);
<span class="macro">assert_eq!</span>(duplicates, [<span class="number">21</span>, <span class="number">30</span>, <span class="number">13</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rotate_left" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.26.0">1.26.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3412">source</a></span><h4 class="code-header">pub fn <a href="#method.rotate_left" class="fn">rotate_left</a>(&amp;mut self, mid: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Rotates the slice in-place such that the first <code>mid</code> elements of the
slice move to the end while the last <code>self.len() - mid</code> elements move to
the front. After calling <code>rotate_left</code>, the element previously at index
<code>mid</code> will become the first element in the slice.</p>
<h5 id="panics-35"><a class="doc-anchor" href="#panics-35">§</a>Panics</h5>
<p>This function will panic if <code>mid</code> is greater than the length of the
slice. Note that <code>mid == self.len()</code> does <em>not</em> panic and is a no-op
rotation.</p>
<h5 id="complexity"><a class="doc-anchor" href="#complexity">§</a>Complexity</h5>
<p>Takes linear (in <code>self.len()</code>) time.</p>
<h5 id="examples-127"><a class="doc-anchor" href="#examples-127">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>a = [<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'e'</span>, <span class="string">'f'</span>];
a.rotate_left(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(a, [<span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'e'</span>, <span class="string">'f'</span>, <span class="string">'a'</span>, <span class="string">'b'</span>]);</code></pre></div>
<p>Rotating a subslice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>a = [<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'e'</span>, <span class="string">'f'</span>];
a[<span class="number">1</span>..<span class="number">5</span>].rotate_left(<span class="number">1</span>);
<span class="macro">assert_eq!</span>(a, [<span class="string">'a'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'e'</span>, <span class="string">'b'</span>, <span class="string">'f'</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.rotate_right" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.26.0">1.26.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3455">source</a></span><h4 class="code-header">pub fn <a href="#method.rotate_right" class="fn">rotate_right</a>(&amp;mut self, k: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Rotates the slice in-place such that the first <code>self.len() - k</code>
elements of the slice move to the end while the last <code>k</code> elements move
to the front. After calling <code>rotate_right</code>, the element previously at
index <code>self.len() - k</code> will become the first element in the slice.</p>
<h5 id="panics-36"><a class="doc-anchor" href="#panics-36">§</a>Panics</h5>
<p>This function will panic if <code>k</code> is greater than the length of the
slice. Note that <code>k == self.len()</code> does <em>not</em> panic and is a no-op
rotation.</p>
<h5 id="complexity-1"><a class="doc-anchor" href="#complexity-1">§</a>Complexity</h5>
<p>Takes linear (in <code>self.len()</code>) time.</p>
<h5 id="examples-128"><a class="doc-anchor" href="#examples-128">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>a = [<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'e'</span>, <span class="string">'f'</span>];
a.rotate_right(<span class="number">2</span>);
<span class="macro">assert_eq!</span>(a, [<span class="string">'e'</span>, <span class="string">'f'</span>, <span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>]);</code></pre></div>
<p>Rotating a subslice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>a = [<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'e'</span>, <span class="string">'f'</span>];
a[<span class="number">1</span>..<span class="number">5</span>].rotate_right(<span class="number">1</span>);
<span class="macro">assert_eq!</span>(a, [<span class="string">'a'</span>, <span class="string">'e'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>, <span class="string">'f'</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.fill" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.50.0">1.50.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3478-3480">source</a></span><h4 class="code-header">pub fn <a href="#method.fill" class="fn">fill</a>(&amp;mut self, value: T)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h4></section></summary><div class="docblock"><p>Fills <code>self</code> with elements by cloning <code>value</code>.</p>
<h5 id="examples-129"><a class="doc-anchor" href="#examples-129">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">10</span>];
buf.fill(<span class="number">1</span>);
<span class="macro">assert_eq!</span>(buf, <span class="macro">vec!</span>[<span class="number">1</span>; <span class="number">10</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.fill_with" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.51.0">1.51.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3502-3504">source</a></span><h4 class="code-header">pub fn <a href="#method.fill_with" class="fn">fill_with</a>&lt;F&gt;(&amp;mut self, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>() -&gt; T,</div></h4></section></summary><div class="docblock"><p>Fills <code>self</code> with elements returned by calling a closure repeatedly.</p>
<p>This method uses a closure to create new values. If you’d rather
<a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone"><code>Clone</code></a> a given value, use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.fill" title="method slice::fill"><code>fill</code></a>. If you want to use the <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default"><code>Default</code></a>
trait to generate values, you can pass <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default" title="associated function core::default::Default::default"><code>Default::default</code></a> as the
argument.</p>
<h5 id="examples-130"><a class="doc-anchor" href="#examples-130">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>buf = <span class="macro">vec!</span>[<span class="number">1</span>; <span class="number">10</span>];
buf.fill_with(Default::default);
<span class="macro">assert_eq!</span>(buf, <span class="macro">vec!</span>[<span class="number">0</span>; <span class="number">10</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from_slice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.7.0">1.7.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3565-3567">source</a></span><h4 class="code-header">pub fn <a href="#method.clone_from_slice" class="fn">clone_from_slice</a>(&amp;mut self, src: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h4></section></summary><div class="docblock"><p>Copies the elements from <code>src</code> into <code>self</code>.</p>
<p>The length of <code>src</code> must be the same as <code>self</code>.</p>
<h5 id="panics-37"><a class="doc-anchor" href="#panics-37">§</a>Panics</h5>
<p>This function will panic if the two slices have different lengths.</p>
<h5 id="examples-131"><a class="doc-anchor" href="#examples-131">§</a>Examples</h5>
<p>Cloning two elements from a slice into another:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>src = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0</span>, <span class="number">0</span>];
<span class="comment">// Because the slices have to be the same length,
// we slice the source slice from four elements
// to two. It will panic if we don't do this.
</span>dst.clone_from_slice(<span class="kw-2">&amp;</span>src[<span class="number">2</span>..]);
<span class="macro">assert_eq!</span>(src, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(dst, [<span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
<p>Rust enforces that there can only be one mutable reference with no
immutable references to a particular piece of data in a particular
scope. Because of this, attempting to use <code>clone_from_slice</code> on a
single slice will result in a compile failure:</p>
<div class="example-wrap compile_fail"><a href="#" class="tooltip" title="This example deliberately fails to compile">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
slice[..<span class="number">2</span>].clone_from_slice(<span class="kw-2">&amp;</span>slice[<span class="number">3</span>..]); <span class="comment">// compile fail!</span></code></pre></div>
<p>To work around this, we can use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at_mut" title="method slice::split_at_mut"><code>split_at_mut</code></a> to create two distinct
sub-slices from a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
{
<span class="kw">let </span>(left, right) = slice.split_at_mut(<span class="number">2</span>);
left.clone_from_slice(<span class="kw-2">&amp;</span>right[<span class="number">1</span>..]);
}
<span class="macro">assert_eq!</span>(slice, [<span class="number">4</span>, <span class="number">5</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.copy_from_slice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.9.0">1.9.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3629-3631">source</a></span><h4 class="code-header">pub fn <a href="#method.copy_from_slice" class="fn">copy_from_slice</a>(&amp;mut self, src: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,</div></h4></section></summary><div class="docblock"><p>Copies all elements from <code>src</code> into <code>self</code>, using a memcpy.</p>
<p>The length of <code>src</code> must be the same as <code>self</code>.</p>
<p>If <code>T</code> does not implement <code>Copy</code>, use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.clone_from_slice" title="method slice::clone_from_slice"><code>clone_from_slice</code></a>.</p>
<h5 id="panics-38"><a class="doc-anchor" href="#panics-38">§</a>Panics</h5>
<p>This function will panic if the two slices have different lengths.</p>
<h5 id="examples-132"><a class="doc-anchor" href="#examples-132">§</a>Examples</h5>
<p>Copying two elements from a slice into another:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>src = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let </span><span class="kw-2">mut </span>dst = [<span class="number">0</span>, <span class="number">0</span>];
<span class="comment">// Because the slices have to be the same length,
// we slice the source slice from four elements
// to two. It will panic if we don't do this.
</span>dst.copy_from_slice(<span class="kw-2">&amp;</span>src[<span class="number">2</span>..]);
<span class="macro">assert_eq!</span>(src, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(dst, [<span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
<p>Rust enforces that there can only be one mutable reference with no
immutable references to a particular piece of data in a particular
scope. Because of this, attempting to use <code>copy_from_slice</code> on a
single slice will result in a compile failure:</p>
<div class="example-wrap compile_fail"><a href="#" class="tooltip" title="This example deliberately fails to compile">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
slice[..<span class="number">2</span>].copy_from_slice(<span class="kw-2">&amp;</span>slice[<span class="number">3</span>..]); <span class="comment">// compile fail!</span></code></pre></div>
<p>To work around this, we can use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at_mut" title="method slice::split_at_mut"><code>split_at_mut</code></a> to create two distinct
sub-slices from a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
{
<span class="kw">let </span>(left, right) = slice.split_at_mut(<span class="number">2</span>);
left.copy_from_slice(<span class="kw-2">&amp;</span>right[<span class="number">1</span>..]);
}
<span class="macro">assert_eq!</span>(slice, [<span class="number">4</span>, <span class="number">5</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.copy_within" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.37.0">1.37.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3683-3685">source</a></span><h4 class="code-header">pub fn <a href="#method.copy_within" class="fn">copy_within</a>&lt;R&gt;(&amp;mut self, src: R, dest: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/range/trait.RangeBounds.html" title="trait core::ops::range::RangeBounds">RangeBounds</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,</div></h4></section></summary><div class="docblock"><p>Copies elements from one part of the slice to another part of itself,
using a memmove.</p>
<p><code>src</code> is the range within <code>self</code> to copy from. <code>dest</code> is the starting
index of the range within <code>self</code> to copy to, which will have the same
length as <code>src</code>. The two ranges may overlap. The ends of the two ranges
must be less than or equal to <code>self.len()</code>.</p>
<h5 id="panics-39"><a class="doc-anchor" href="#panics-39">§</a>Panics</h5>
<p>This function will panic if either range exceeds the end of the slice,
or if the end of <code>src</code> is before the start.</p>
<h5 id="examples-133"><a class="doc-anchor" href="#examples-133">§</a>Examples</h5>
<p>Copying four bytes within a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="kw-2">*</span><span class="string">b"Hello, World!"</span>;
bytes.copy_within(<span class="number">1</span>..<span class="number">5</span>, <span class="number">8</span>);
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>bytes, <span class="string">b"Hello, Wello!"</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.swap_with_slice" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.27.0">1.27.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3750">source</a></span><h4 class="code-header">pub fn <a href="#method.swap_with_slice" class="fn">swap_with_slice</a>(&amp;mut self, other: &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Swaps all elements in <code>self</code> with those in <code>other</code>.</p>
<p>The length of <code>other</code> must be the same as <code>self</code>.</p>
<h5 id="panics-40"><a class="doc-anchor" href="#panics-40">§</a>Panics</h5>
<p>This function will panic if the two slices have different lengths.</p>
<h5 id="example"><a class="doc-anchor" href="#example">§</a>Example</h5>
<p>Swapping two elements across slices:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice1 = [<span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let </span><span class="kw-2">mut </span>slice2 = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
slice1.swap_with_slice(<span class="kw-2">&amp;mut </span>slice2[<span class="number">2</span>..]);
<span class="macro">assert_eq!</span>(slice1, [<span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>(slice2, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>]);</code></pre></div>
<p>Rust enforces that there can only be one mutable reference to a
particular piece of data in a particular scope. Because of this,
attempting to use <code>swap_with_slice</code> on a single slice will result in
a compile failure:</p>
<div class="example-wrap compile_fail"><a href="#" class="tooltip" title="This example deliberately fails to compile">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
slice[..<span class="number">2</span>].swap_with_slice(<span class="kw-2">&amp;mut </span>slice[<span class="number">3</span>..]); <span class="comment">// compile fail!</span></code></pre></div>
<p>To work around this, we can use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.split_at_mut" title="method slice::split_at_mut"><code>split_at_mut</code></a> to create two distinct
mutable sub-slices from a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>slice = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
{
<span class="kw">let </span>(left, right) = slice.split_at_mut(<span class="number">2</span>);
left.swap_with_slice(<span class="kw-2">&amp;mut </span>right[<span class="number">1</span>..]);
}
<span class="macro">assert_eq!</span>(slice, [<span class="number">4</span>, <span class="number">5</span>, <span class="number">3</span>, <span class="number">1</span>, <span class="number">2</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.align_to" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.30.0">1.30.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3827">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.align_to" class="fn">align_to</a>&lt;U&gt;(&amp;self) -&gt; (&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[U]</a>, &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Transmute the slice to a slice of another type, ensuring alignment of the types is
maintained.</p>
<p>This method splits the slice into three distinct slices: prefix, correctly aligned middle
slice of a new type, and the suffix slice. The middle part will be as big as possible under
the given alignment constraint and element size.</p>
<p>This method has no purpose when either input element <code>T</code> or output element <code>U</code> are
zero-sized and will return the original slice without splitting anything.</p>
<h5 id="safety-8"><a class="doc-anchor" href="#safety-8">§</a>Safety</h5>
<p>This method is essentially a <code>transmute</code> with respect to the elements in the returned
middle slice, so all the usual caveats pertaining to <code>transmute::&lt;T, U&gt;</code> also apply here.</p>
<h5 id="examples-134"><a class="doc-anchor" href="#examples-134">§</a>Examples</h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">unsafe </span>{
<span class="kw">let </span>bytes: [u8; <span class="number">7</span>] = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>];
<span class="kw">let </span>(prefix, shorts, suffix) = bytes.align_to::&lt;u16&gt;();
<span class="comment">// less_efficient_algorithm_for_bytes(prefix);
// more_efficient_algorithm_for_aligned_shorts(shorts);
// less_efficient_algorithm_for_bytes(suffix);
</span>}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.align_to_mut" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.30.0">1.30.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3892">source</a></span><h4 class="code-header">pub unsafe fn <a href="#method.align_to_mut" class="fn">align_to_mut</a>&lt;U&gt;(&amp;mut self) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[U]</a>, &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)</h4></section></summary><div class="docblock"><p>Transmute the mutable slice to a mutable slice of another type, ensuring alignment of the
types is maintained.</p>
<p>This method splits the slice into three distinct slices: prefix, correctly aligned middle
slice of a new type, and the suffix slice. The middle part will be as big as possible under
the given alignment constraint and element size.</p>
<p>This method has no purpose when either input element <code>T</code> or output element <code>U</code> are
zero-sized and will return the original slice without splitting anything.</p>
<h5 id="safety-9"><a class="doc-anchor" href="#safety-9">§</a>Safety</h5>
<p>This method is essentially a <code>transmute</code> with respect to the elements in the returned
middle slice, so all the usual caveats pertaining to <code>transmute::&lt;T, U&gt;</code> also apply here.</p>
<h5 id="examples-135"><a class="doc-anchor" href="#examples-135">§</a>Examples</h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">unsafe </span>{
<span class="kw">let </span><span class="kw-2">mut </span>bytes: [u8; <span class="number">7</span>] = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>];
<span class="kw">let </span>(prefix, shorts, suffix) = bytes.align_to_mut::&lt;u16&gt;();
<span class="comment">// less_efficient_algorithm_for_bytes(prefix);
// more_efficient_algorithm_for_aligned_shorts(shorts);
// less_efficient_algorithm_for_bytes(suffix);
</span>}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_simd" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#3992-3996">source</a><h4 class="code-header">pub fn <a href="#method.as_simd" class="fn">as_simd</a>&lt;const LANES: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(&amp;self) -&gt; (&amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;[<a class="struct" href="https://doc.rust-lang.org/nightly/core/core_simd/vector/struct.Simd.html" title="struct core::core_simd::vector::Simd">Simd</a>&lt;T, LANES&gt;], &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
<a class="struct" href="https://doc.rust-lang.org/nightly/core/core_simd/vector/struct.Simd.html" title="struct core::core_simd::vector::Simd">Simd</a>&lt;T, LANES&gt;: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; LANES]</a>&gt;,
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/core_simd/vector/trait.SimdElement.html" title="trait core::core_simd::vector::SimdElement">SimdElement</a>,
<a class="struct" href="https://doc.rust-lang.org/nightly/core/core_simd/lane_count/struct.LaneCount.html" title="struct core::core_simd::lane_count::LaneCount">LaneCount</a>&lt;LANES&gt;: <a class="trait" href="https://doc.rust-lang.org/nightly/core/core_simd/lane_count/trait.SupportedLaneCount.html" title="trait core::core_simd::lane_count::SupportedLaneCount">SupportedLaneCount</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>portable_simd</code>)</span></div></span></summary><div class="docblock"><p>Split a slice into a prefix, a middle of aligned SIMD types, and a suffix.</p>
<p>This is a safe wrapper around <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.align_to" title="method slice::align_to"><code>slice::align_to</code></a>, so has the same weak
postconditions as that method. You’re only assured that
<code>self.len() == prefix.len() + middle.len() * LANES + suffix.len()</code>.</p>
<p>Notably, all of the following are possible:</p>
<ul>
<li><code>prefix.len() &gt;= LANES</code>.</li>
<li><code>middle.is_empty()</code> despite <code>self.len() &gt;= 3 * LANES</code>.</li>
<li><code>suffix.len() &gt;= LANES</code>.</li>
</ul>
<p>That said, this is a safe method, so if you’re only writing safe code,
then this can at most cause incorrect logic, not unsoundness.</p>
<h5 id="panics-41"><a class="doc-anchor" href="#panics-41">§</a>Panics</h5>
<p>This will panic if the size of the SIMD type is different from
<code>LANES</code> times that of the scalar.</p>
<p>At the time of writing, the trait restrictions on <code>Simd&lt;T, LANES&gt;</code> keeps
that from ever happening, as only power-of-two numbers of lanes are
supported. It’s possible that, in the future, those restrictions might
be lifted in a way that would make it possible to see panics from this
method for something like <code>LANES == 3</code>.</p>
<h5 id="examples-136"><a class="doc-anchor" href="#examples-136">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(portable_simd)]
</span><span class="kw">use </span>core::simd::prelude::<span class="kw-2">*</span>;
<span class="kw">let </span>short = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let </span>(prefix, middle, suffix) = short.as_simd::&lt;<span class="number">4</span>&gt;();
<span class="macro">assert_eq!</span>(middle, []); <span class="comment">// Not enough elements for anything in the middle
// They might be split in any possible way between prefix and suffix
</span><span class="kw">let </span>it = prefix.iter().chain(suffix).copied();
<span class="macro">assert_eq!</span>(it.collect::&lt;Vec&lt;<span class="kw">_</span>&gt;&gt;(), <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="kw">fn </span>basic_simd_sum(x: <span class="kw-2">&amp;</span>[f32]) -&gt; f32 {
<span class="kw">use </span>std::ops::Add;
<span class="kw">let </span>(prefix, middle, suffix) = x.as_simd();
<span class="kw">let </span>sums = f32x4::from_array([
prefix.iter().copied().sum(),
<span class="number">0.0</span>,
<span class="number">0.0</span>,
suffix.iter().copied().sum(),
]);
<span class="kw">let </span>sums = middle.iter().copied().fold(sums, f32x4::add);
sums.reduce_sum()
}
<span class="kw">let </span>numbers: Vec&lt;f32&gt; = (<span class="number">1</span>..<span class="number">101</span>).map(|x| x <span class="kw">as _</span>).collect();
<span class="macro">assert_eq!</span>(basic_simd_sum(<span class="kw-2">&amp;</span>numbers[<span class="number">1</span>..<span class="number">99</span>]), <span class="number">4949.0</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_simd_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4037-4041">source</a><h4 class="code-header">pub fn <a href="#method.as_simd_mut" class="fn">as_simd_mut</a>&lt;const LANES: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(
&amp;mut self
) -&gt; (&amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, &amp;mut [<a class="struct" href="https://doc.rust-lang.org/nightly/core/core_simd/vector/struct.Simd.html" title="struct core::core_simd::vector::Simd">Simd</a>&lt;T, LANES&gt;], &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>)<div class="where">where
<a class="struct" href="https://doc.rust-lang.org/nightly/core/core_simd/vector/struct.Simd.html" title="struct core::core_simd::vector::Simd">Simd</a>&lt;T, LANES&gt;: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsMut.html" title="trait core::convert::AsMut">AsMut</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">[T; LANES]</a>&gt;,
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/core_simd/vector/trait.SimdElement.html" title="trait core::core_simd::vector::SimdElement">SimdElement</a>,
<a class="struct" href="https://doc.rust-lang.org/nightly/core/core_simd/lane_count/struct.LaneCount.html" title="struct core::core_simd::lane_count::LaneCount">LaneCount</a>&lt;LANES&gt;: <a class="trait" href="https://doc.rust-lang.org/nightly/core/core_simd/lane_count/trait.SupportedLaneCount.html" title="trait core::core_simd::lane_count::SupportedLaneCount">SupportedLaneCount</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>portable_simd</code>)</span></div></span></summary><div class="docblock"><p>Split a mutable slice into a mutable prefix, a middle of aligned SIMD types,
and a mutable suffix.</p>
<p>This is a safe wrapper around <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.align_to_mut" title="method slice::align_to_mut"><code>slice::align_to_mut</code></a>, so has the same weak
postconditions as that method. You’re only assured that
<code>self.len() == prefix.len() + middle.len() * LANES + suffix.len()</code>.</p>
<p>Notably, all of the following are possible:</p>
<ul>
<li><code>prefix.len() &gt;= LANES</code>.</li>
<li><code>middle.is_empty()</code> despite <code>self.len() &gt;= 3 * LANES</code>.</li>
<li><code>suffix.len() &gt;= LANES</code>.</li>
</ul>
<p>That said, this is a safe method, so if you’re only writing safe code,
then this can at most cause incorrect logic, not unsoundness.</p>
<p>This is the mutable version of <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.as_simd" title="method slice::as_simd"><code>slice::as_simd</code></a>; see that for examples.</p>
<h5 id="panics-42"><a class="doc-anchor" href="#panics-42">§</a>Panics</h5>
<p>This will panic if the size of the SIMD type is different from
<code>LANES</code> times that of the scalar.</p>
<p>At the time of writing, the trait restrictions on <code>Simd&lt;T, LANES&gt;</code> keeps
that from ever happening, as only power-of-two numbers of lanes are
supported. It’s possible that, in the future, those restrictions might
be lifted in a way that would make it possible to see panics from this
method for something like <code>LANES == 3</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_sorted" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4077-4079">source</a><h4 class="code-header">pub fn <a href="#method.is_sorted" class="fn">is_sorted</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>is_sorted</code>)</span></div></span></summary><div class="docblock"><p>Checks if the elements of this slice are sorted.</p>
<p>That is, for each element <code>a</code> and its following element <code>b</code>, <code>a &lt;= b</code> must hold. If the
slice yields exactly zero or one element, <code>true</code> is returned.</p>
<p>Note that if <code>Self::Item</code> is only <code>PartialOrd</code>, but not <code>Ord</code>, the above definition
implies that this function returns <code>false</code> if any two consecutive items are not
comparable.</p>
<h5 id="examples-137"><a class="doc-anchor" href="#examples-137">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(is_sorted)]
</span><span class="kw">let </span>empty: [i32; <span class="number">0</span>] = [];
<span class="macro">assert!</span>([<span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">9</span>].is_sorted());
<span class="macro">assert!</span>(![<span class="number">1</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">4</span>].is_sorted());
<span class="macro">assert!</span>([<span class="number">0</span>].is_sorted());
<span class="macro">assert!</span>(empty.is_sorted());
<span class="macro">assert!</span>(![<span class="number">0.0</span>, <span class="number">1.0</span>, f32::NAN].is_sorted());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_sorted_by" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4106-4108">source</a><h4 class="code-header">pub fn <a href="#method.is_sorted_by" class="fn">is_sorted_by</a>&lt;'a, F&gt;(&amp;'a self, compare: F) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>is_sorted</code>)</span></div></span></summary><div class="docblock"><p>Checks if the elements of this slice are sorted using the given comparator function.</p>
<p>Instead of using <code>PartialOrd::partial_cmp</code>, this function uses the given <code>compare</code>
function to determine whether two elements are to be considered in sorted order.</p>
<h5 id="examples-138"><a class="doc-anchor" href="#examples-138">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(is_sorted)]
</span><span class="macro">assert!</span>([<span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">9</span>].is_sorted_by(|a, b| a &lt;= b));
<span class="macro">assert!</span>(![<span class="number">1</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">9</span>].is_sorted_by(|a, b| a &lt; b));
<span class="macro">assert!</span>([<span class="number">0</span>].is_sorted_by(|a, b| <span class="bool-val">true</span>));
<span class="macro">assert!</span>([<span class="number">0</span>].is_sorted_by(|a, b| <span class="bool-val">false</span>));
<span class="kw">let </span>empty: [i32; <span class="number">0</span>] = [];
<span class="macro">assert!</span>(empty.is_sorted_by(|a, b| <span class="bool-val">false</span>));
<span class="macro">assert!</span>(empty.is_sorted_by(|a, b| <span class="bool-val">true</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_sorted_by_key" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4132-4135">source</a><h4 class="code-header">pub fn <a href="#method.is_sorted_by_key" class="fn">is_sorted_by_key</a>&lt;'a, F, K&gt;(&amp;'a self, f: F) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a><div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>is_sorted</code>)</span></div></span></summary><div class="docblock"><p>Checks if the elements of this slice are sorted using the given key extraction function.</p>
<p>Instead of comparing the slice’s elements directly, this function compares the keys of the
elements, as determined by <code>f</code>. Apart from that, it’s equivalent to <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_sorted" title="method slice::is_sorted"><code>is_sorted</code></a>; see its
documentation for more information.</p>
<h5 id="examples-139"><a class="doc-anchor" href="#examples-139">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(is_sorted)]
</span><span class="macro">assert!</span>([<span class="string">"c"</span>, <span class="string">"bb"</span>, <span class="string">"aaa"</span>].is_sorted_by_key(|s| s.len()));
<span class="macro">assert!</span>(![-<span class="number">2i32</span>, -<span class="number">1</span>, <span class="number">0</span>, <span class="number">3</span>].is_sorted_by_key(|n| n.abs()));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.partition_point" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.52.0">1.52.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4191-4193">source</a></span><h4 class="code-header">pub fn <a href="#method.partition_point" class="fn">partition_point</a>&lt;P&gt;(&amp;self, pred: P) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Returns the index of the partition point according to the given predicate
(the index of the first element of the second partition).</p>
<p>The slice is assumed to be partitioned according to the given predicate.
This means that all elements for which the predicate returns true are at the start of the slice
and all elements for which the predicate returns false are at the end.
For example, <code>[7, 15, 3, 5, 4, 12, 6]</code> is partitioned under the predicate <code>x % 2 != 0</code>
(all odd numbers are at the start, all even at the end).</p>
<p>If this slice is not partitioned, the returned result is unspecified and meaningless,
as this method performs a kind of binary search.</p>
<p>See also <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search" title="method slice::binary_search"><code>binary_search</code></a>, <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search_by" title="method slice::binary_search_by"><code>binary_search_by</code></a>, and <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.binary_search_by_key" title="method slice::binary_search_by_key"><code>binary_search_by_key</code></a>.</p>
<h5 id="examples-140"><a class="doc-anchor" href="#examples-140">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>v = [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>];
<span class="kw">let </span>i = v.partition_point(|<span class="kw-2">&amp;</span>x| x &lt; <span class="number">5</span>);
<span class="macro">assert_eq!</span>(i, <span class="number">4</span>);
<span class="macro">assert!</span>(v[..i].iter().all(|<span class="kw-2">&amp;</span>x| x &lt; <span class="number">5</span>));
<span class="macro">assert!</span>(v[i..].iter().all(|<span class="kw-2">&amp;</span>x| !(x &lt; <span class="number">5</span>)));</code></pre></div>
<p>If all elements of the slice match the predicate, including if the slice
is empty, then the length of the slice will be returned:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>a = [<span class="number">2</span>, <span class="number">4</span>, <span class="number">8</span>];
<span class="macro">assert_eq!</span>(a.partition_point(|x| x &lt; <span class="kw-2">&amp;</span><span class="number">100</span>), a.len());
<span class="kw">let </span>a: [i32; <span class="number">0</span>] = [];
<span class="macro">assert_eq!</span>(a.partition_point(|x| x &lt; <span class="kw-2">&amp;</span><span class="number">100</span>), <span class="number">0</span>);</code></pre></div>
<p>If you want to insert an item to a sorted vector, while maintaining
sort order:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>s = <span class="macro">vec!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">55</span>];
<span class="kw">let </span>num = <span class="number">42</span>;
<span class="kw">let </span>idx = s.partition_point(|<span class="kw-2">&amp;</span>x| x &lt;= num);
s.insert(idx, num);
<span class="macro">assert_eq!</span>(s, [<span class="number">0</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">5</span>, <span class="number">8</span>, <span class="number">13</span>, <span class="number">21</span>, <span class="number">34</span>, <span class="number">42</span>, <span class="number">55</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4249">source</a><h4 class="code-header">pub fn <a href="#method.take" class="fn">take</a>&lt;'a, R&gt;(self: &amp;mut &amp;'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, range: R) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/range/trait.OneSidedRange.html" title="trait core::ops::range::OneSidedRange">OneSidedRange</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_take</code>)</span></div></span></summary><div class="docblock"><p>Removes the subslice corresponding to the given range
and returns a reference to it.</p>
<p>Returns <code>None</code> and does not modify the slice if the given
range is out of bounds.</p>
<p>Note that this method only accepts one-sided ranges such as
<code>2..</code> or <code>..6</code>, but not <code>2..6</code>.</p>
<h5 id="examples-141"><a class="doc-anchor" href="#examples-141">§</a>Examples</h5>
<p>Taking the first three elements of a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] = <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>first_three = slice.take(..<span class="number">3</span>).unwrap();
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'d'</span>]);
<span class="macro">assert_eq!</span>(first_three, <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>]);</code></pre></div>
<p>Taking the last two elements of a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] = <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>tail = slice.take(<span class="number">2</span>..).unwrap();
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>]);
<span class="macro">assert_eq!</span>(tail, <span class="kw-2">&amp;</span>[<span class="string">'c'</span>, <span class="string">'d'</span>]);</code></pre></div>
<p>Getting <code>None</code> when <code>range</code> is out of bounds:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] = <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, slice.take(<span class="number">5</span>..));
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, slice.take(..<span class="number">5</span>));
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, slice.take(..=<span class="number">4</span>));
<span class="kw">let </span>expected: <span class="kw-2">&amp;</span>[char] = <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(expected), slice.take(..<span class="number">4</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4318-4321">source</a><h4 class="code-header">pub fn <a href="#method.take_mut" class="fn">take_mut</a>&lt;'a, R&gt;(self: &amp;mut &amp;'a mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>, range: R) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;'a mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>&gt;<div class="where">where
R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/range/trait.OneSidedRange.html" title="trait core::ops::range::OneSidedRange">OneSidedRange</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_take</code>)</span></div></span></summary><div class="docblock"><p>Removes the subslice corresponding to the given range
and returns a mutable reference to it.</p>
<p>Returns <code>None</code> and does not modify the slice if the given
range is out of bounds.</p>
<p>Note that this method only accepts one-sided ranges such as
<code>2..</code> or <code>..6</code>, but not <code>2..6</code>.</p>
<h5 id="examples-142"><a class="doc-anchor" href="#examples-142">§</a>Examples</h5>
<p>Taking the first three elements of a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;mut </span>[<span class="kw">_</span>] = <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>first_three = slice.take_mut(..<span class="number">3</span>).unwrap();
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;mut </span>[<span class="string">'d'</span>]);
<span class="macro">assert_eq!</span>(first_three, <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>]);</code></pre></div>
<p>Taking the last two elements of a slice:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;mut </span>[<span class="kw">_</span>] = <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="kw">let </span><span class="kw-2">mut </span>tail = slice.take_mut(<span class="number">2</span>..).unwrap();
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>]);
<span class="macro">assert_eq!</span>(tail, <span class="kw-2">&amp;mut </span>[<span class="string">'c'</span>, <span class="string">'d'</span>]);</code></pre></div>
<p>Getting <code>None</code> when <code>range</code> is out of bounds:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;mut </span>[<span class="kw">_</span>] = <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, slice.take_mut(<span class="number">5</span>..));
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, slice.take_mut(..<span class="number">5</span>));
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, slice.take_mut(..=<span class="number">4</span>));
<span class="kw">let </span>expected: <span class="kw-2">&amp;mut </span>[<span class="kw">_</span>] = <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>, <span class="string">'d'</span>];
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(expected), slice.take_mut(..<span class="number">4</span>));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take_first" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4357">source</a><h4 class="code-header">pub fn <a href="#method.take_first" class="fn">take_first</a>&lt;'a&gt;(self: &amp;mut &amp;'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_take</code>)</span></div></span></summary><div class="docblock"><p>Removes the first element of the slice and returns a reference
to it.</p>
<p>Returns <code>None</code> if the slice is empty.</p>
<h5 id="examples-143"><a class="doc-anchor" href="#examples-143">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] = <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>];
<span class="kw">let </span>first = slice.take_first().unwrap();
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'b'</span>, <span class="string">'c'</span>]);
<span class="macro">assert_eq!</span>(first, <span class="kw-2">&amp;</span><span class="string">'a'</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take_first_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4382">source</a><h4 class="code-header">pub fn <a href="#method.take_first_mut" class="fn">take_first_mut</a>&lt;'a&gt;(self: &amp;mut &amp;'a mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut T</a>&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_take</code>)</span></div></span></summary><div class="docblock"><p>Removes the first element of the slice and returns a mutable
reference to it.</p>
<p>Returns <code>None</code> if the slice is empty.</p>
<h5 id="examples-144"><a class="doc-anchor" href="#examples-144">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;mut </span>[<span class="kw">_</span>] = <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>];
<span class="kw">let </span>first = slice.take_first_mut().unwrap();
<span class="kw-2">*</span>first = <span class="string">'d'</span>;
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'b'</span>, <span class="string">'c'</span>]);
<span class="macro">assert_eq!</span>(first, <span class="kw-2">&amp;</span><span class="string">'d'</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take_last" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4406">source</a><h4 class="code-header">pub fn <a href="#method.take_last" class="fn">take_last</a>&lt;'a&gt;(self: &amp;mut &amp;'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a T</a>&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_take</code>)</span></div></span></summary><div class="docblock"><p>Removes the last element of the slice and returns a reference
to it.</p>
<p>Returns <code>None</code> if the slice is empty.</p>
<h5 id="examples-145"><a class="doc-anchor" href="#examples-145">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;</span>[<span class="kw">_</span>] = <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>];
<span class="kw">let </span>last = slice.take_last().unwrap();
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>]);
<span class="macro">assert_eq!</span>(last, <span class="kw-2">&amp;</span><span class="string">'c'</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.take_last_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4431">source</a><h4 class="code-header">pub fn <a href="#method.take_last_mut" class="fn">take_last_mut</a>&lt;'a&gt;(self: &amp;mut &amp;'a mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;'a mut T</a>&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>slice_take</code>)</span></div></span></summary><div class="docblock"><p>Removes the last element of the slice and returns a mutable
reference to it.</p>
<p>Returns <code>None</code> if the slice is empty.</p>
<h5 id="examples-146"><a class="doc-anchor" href="#examples-146">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(slice_take)]
</span><span class="kw">let </span><span class="kw-2">mut </span>slice: <span class="kw-2">&amp;mut </span>[<span class="kw">_</span>] = <span class="kw-2">&amp;mut </span>[<span class="string">'a'</span>, <span class="string">'b'</span>, <span class="string">'c'</span>];
<span class="kw">let </span>last = slice.take_last_mut().unwrap();
<span class="kw-2">*</span>last = <span class="string">'d'</span>;
<span class="macro">assert_eq!</span>(slice, <span class="kw-2">&amp;</span>[<span class="string">'a'</span>, <span class="string">'b'</span>]);
<span class="macro">assert_eq!</span>(last, <span class="kw-2">&amp;</span><span class="string">'d'</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_many_unchecked_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4465-4468">source</a><h4 class="code-header">pub unsafe fn <a href="#method.get_many_unchecked_mut" class="fn">get_many_unchecked_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(
&amp;mut self,
indices: [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">N</a>]
) -&gt; [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">N</a>]</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>get_many_mut</code>)</span></div></span></summary><div class="docblock"><p>Returns mutable references to many indices at once, without doing any checks.</p>
<p>For a safe alternative see <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.get_many_mut" title="method slice::get_many_mut"><code>get_many_mut</code></a>.</p>
<h5 id="safety-10"><a class="doc-anchor" href="#safety-10">§</a>Safety</h5>
<p>Calling this method with overlapping or out-of-bounds indices is <em><a href="https://doc.rust-lang.org/reference/behavior-considered-undefined.html">undefined behavior</a></em>
even if the resulting references are not used.</p>
<h5 id="examples-147"><a class="doc-anchor" href="#examples-147">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(get_many_mut)]
</span><span class="kw">let </span>x = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>];
<span class="kw">unsafe </span>{
<span class="kw">let </span>[a, b] = x.get_many_unchecked_mut([<span class="number">0</span>, <span class="number">2</span>]);
<span class="kw-2">*</span>a <span class="kw-2">*</span>= <span class="number">10</span>;
<span class="kw-2">*</span>b <span class="kw-2">*</span>= <span class="number">100</span>;
}
<span class="macro">assert_eq!</span>(x, <span class="kw-2">&amp;</span>[<span class="number">10</span>, <span class="number">2</span>, <span class="number">400</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.get_many_mut" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4507-4510">source</a><h4 class="code-header">pub fn <a href="#method.get_many_mut" class="fn">get_many_mut</a>&lt;const N: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;(
&amp;mut self,
indices: [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">N</a>]
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.array.html">N</a>], <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/struct.GetManyMutError.html" title="struct core::slice::GetManyMutError">GetManyMutError</a>&lt;N&gt;&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>get_many_mut</code>)</span></div></span></summary><div class="docblock"><p>Returns mutable references to many indices at once.</p>
<p>Returns an error if any index is out-of-bounds, or if the same index was
passed more than once.</p>
<h5 id="examples-148"><a class="doc-anchor" href="#examples-148">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(get_many_mut)]
</span><span class="kw">let </span>v = <span class="kw-2">&amp;mut </span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">if let </span><span class="prelude-val">Ok</span>([a, b]) = v.get_many_mut([<span class="number">0</span>, <span class="number">2</span>]) {
<span class="kw-2">*</span>a = <span class="number">413</span>;
<span class="kw-2">*</span>b = <span class="number">612</span>;
}
<span class="macro">assert_eq!</span>(v, <span class="kw-2">&amp;</span>[<span class="number">413</span>, <span class="number">2</span>, <span class="number">612</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.utf8_chunks" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.79.0">1.79.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/str/lossy.rs.html#44">source</a></span><h4 class="code-header">pub fn <a href="#method.utf8_chunks" class="fn">utf8_chunks</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/lossy/struct.Utf8Chunks.html" title="struct core::str::lossy::Utf8Chunks">Utf8Chunks</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Creates an iterator over the contiguous valid UTF-8 ranges of this
slice, and the non-UTF-8 fragments in between.</p>
<h5 id="examples-149"><a class="doc-anchor" href="#examples-149">§</a>Examples</h5>
<p>This function formats arbitrary but mostly-UTF-8 bytes into Rust source
code in the form of a C-string literal (<code>c&quot;...&quot;</code>).</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::fmt::Write <span class="kw">as _</span>;
<span class="kw">pub fn </span>cstr_literal(bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; String {
<span class="kw">let </span><span class="kw-2">mut </span>repr = String::new();
repr.push_str(<span class="string">"c\""</span>);
<span class="kw">for </span>chunk <span class="kw">in </span>bytes.utf8_chunks() {
<span class="kw">for </span>ch <span class="kw">in </span>chunk.valid().chars() {
<span class="comment">// Escapes \0, \t, \r, \n, \\, \', \", and uses \u{...} for non-printable characters.
</span><span class="macro">write!</span>(repr, <span class="string">"{}"</span>, ch.escape_debug()).unwrap();
}
<span class="kw">for </span>byte <span class="kw">in </span>chunk.invalid() {
<span class="macro">write!</span>(repr, <span class="string">"\\x{:02X}"</span>, byte).unwrap();
}
}
repr.push(<span class="string">'"'</span>);
repr
}
<span class="kw">fn </span>main() {
<span class="kw">let </span>lit = cstr_literal(<span class="string">b"\xferris the \xf0\x9f\xa6\x80\x07"</span>);
<span class="kw">let </span>expected = <span class="macro">stringify!</span>(<span class="string">c"\xFErris the 🦀\u{7}"</span>);
<span class="macro">assert_eq!</span>(lit, expected);
}</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.is_ascii" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#17">source</a></span><h4 class="code-header">pub fn <a href="#method.is_ascii" class="fn">is_ascii</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Checks if all bytes in this slice are within the ASCII range.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_ascii" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#26">source</a><h4 class="code-header">pub fn <a href="#method.as_ascii" class="fn">as_ascii</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;&amp;[<a class="enum" href="https://doc.rust-lang.org/nightly/core/ascii/ascii_char/enum.AsciiChar.html" title="enum core::ascii::ascii_char::AsciiChar">AsciiChar</a>]&gt;</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>ascii_char</code>)</span></div></span></summary><div class="docblock"><p>If this slice <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.is_ascii" title="method slice::is_ascii"><code>is_ascii</code></a>, returns it as a slice of
<a href="https://doc.rust-lang.org/nightly/core/ascii/ascii_char/enum.AsciiChar.html" title="enum core::ascii::ascii_char::AsciiChar">ASCII characters</a>, otherwise returns <code>None</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_ascii_unchecked" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#44">source</a><h4 class="code-header">pub unsafe fn <a href="#method.as_ascii_unchecked" class="fn">as_ascii_unchecked</a>(&amp;self) -&gt; &amp;[<a class="enum" href="https://doc.rust-lang.org/nightly/core/ascii/ascii_char/enum.AsciiChar.html" title="enum core::ascii::ascii_char::AsciiChar">AsciiChar</a>]</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>ascii_char</code>)</span></div></span></summary><div class="docblock"><p>Converts this slice of bytes into a slice of ASCII characters,
without checking whether they’re valid.</p>
<h5 id="safety-11"><a class="doc-anchor" href="#safety-11">§</a>Safety</h5>
<p>Every byte in the slice must be in <code>0..=127</code>, or else this is UB.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.eq_ignore_ascii_case" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#58">source</a></span><h4 class="code-header">pub fn <a href="#method.eq_ignore_ascii_case" class="fn">eq_ignore_ascii_case</a>(&amp;self, other: &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>]) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Checks that two slices are an ASCII case-insensitive match.</p>
<p>Same as <code>to_ascii_lowercase(a) == to_ascii_lowercase(b)</code>,
but without allocating and copying temporaries.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.make_ascii_uppercase" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#73">source</a></span><h4 class="code-header">pub fn <a href="#method.make_ascii_uppercase" class="fn">make_ascii_uppercase</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Converts this slice to its ASCII upper case equivalent in-place.</p>
<p>ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’,
but non-ASCII letters are unchanged.</p>
<p>To return a new uppercased value without modifying the existing one, use
<a href="#method.to_ascii_uppercase"><code>to_ascii_uppercase</code></a>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.make_ascii_lowercase" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#90">source</a></span><h4 class="code-header">pub fn <a href="#method.make_ascii_lowercase" class="fn">make_ascii_lowercase</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Converts this slice to its ASCII lower case equivalent in-place.</p>
<p>ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’,
but non-ASCII letters are unchanged.</p>
<p>To return a new lowercased value without modifying the existing one, use
<a href="#method.to_ascii_lowercase"><code>to_ascii_lowercase</code></a>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.escape_ascii" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.60.0">1.60.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#110">source</a></span><h4 class="code-header">pub fn <a href="#method.escape_ascii" class="fn">escape_ascii</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/ascii/struct.EscapeAscii.html" title="struct core::slice::ascii::EscapeAscii">EscapeAscii</a>&lt;'_&gt;</h4></section></summary><div class="docblock"><p>Returns an iterator that produces an escaped version of this slice,
treating it as an ASCII string.</p>
<h5 id="examples-150"><a class="doc-anchor" href="#examples-150">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code>
<span class="kw">let </span>s = <span class="string">b"0\t\r\n'\"\\\x9d"</span>;
<span class="kw">let </span>escaped = s.escape_ascii().to_string();
<span class="macro">assert_eq!</span>(escaped, <span class="string">"0\\t\\r\\n\\'\\\"\\\\\\x9d"</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.trim_ascii_start" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#129">source</a></span><h4 class="code-header">pub fn <a href="#method.trim_ascii_start" class="fn">trim_ascii_start</a>(&amp;self) -&gt; &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>] <a href="#" class="tooltip" data-notable-ty="&amp;[u8]">ⓘ</a></h4></section></summary><div class="docblock"><p>Returns a byte slice with leading ASCII whitespace bytes removed.</p>
<p>‘Whitespace’ refers to the definition used by
<a href="https://doc.rust-lang.org/nightly/std/primitive.u8.html#method.is_ascii_whitespace" title="method u8::is_ascii_whitespace"><code>u8::is_ascii_whitespace</code></a>.</p>
<h5 id="examples-151"><a class="doc-anchor" href="#examples-151">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">b" \t hello world\n"</span>.trim_ascii_start(), <span class="string">b"hello world\n"</span>);
<span class="macro">assert_eq!</span>(<span class="string">b" "</span>.trim_ascii_start(), <span class="string">b""</span>);
<span class="macro">assert_eq!</span>(<span class="string">b""</span>.trim_ascii_start(), <span class="string">b""</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.trim_ascii_end" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#158">source</a></span><h4 class="code-header">pub fn <a href="#method.trim_ascii_end" class="fn">trim_ascii_end</a>(&amp;self) -&gt; &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>] <a href="#" class="tooltip" data-notable-ty="&amp;[u8]">ⓘ</a></h4></section></summary><div class="docblock"><p>Returns a byte slice with trailing ASCII whitespace bytes removed.</p>
<p>‘Whitespace’ refers to the definition used by
<a href="https://doc.rust-lang.org/nightly/std/primitive.u8.html#method.is_ascii_whitespace" title="method u8::is_ascii_whitespace"><code>u8::is_ascii_whitespace</code></a>.</p>
<h5 id="examples-152"><a class="doc-anchor" href="#examples-152">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">b"\r hello world\n "</span>.trim_ascii_end(), <span class="string">b"\r hello world"</span>);
<span class="macro">assert_eq!</span>(<span class="string">b" "</span>.trim_ascii_end(), <span class="string">b""</span>);
<span class="macro">assert_eq!</span>(<span class="string">b""</span>.trim_ascii_end(), <span class="string">b""</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.trim_ascii" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.80.0">1.80.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/slice/ascii.rs.html#188">source</a></span><h4 class="code-header">pub fn <a href="#method.trim_ascii" class="fn">trim_ascii</a>(&amp;self) -&gt; &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>] <a href="#" class="tooltip" data-notable-ty="&amp;[u8]">ⓘ</a></h4></section></summary><div class="docblock"><p>Returns a byte slice with leading and trailing ASCII whitespace bytes
removed.</p>
<p>‘Whitespace’ refers to the definition used by
<a href="https://doc.rust-lang.org/nightly/std/primitive.u8.html#method.is_ascii_whitespace" title="method u8::is_ascii_whitespace"><code>u8::is_ascii_whitespace</code></a>.</p>
<h5 id="examples-153"><a class="doc-anchor" href="#examples-153">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>(<span class="string">b"\r hello world\n "</span>.trim_ascii(), <span class="string">b"hello world"</span>);
<span class="macro">assert_eq!</span>(<span class="string">b" "</span>.trim_ascii(), <span class="string">b""</span>);
<span class="macro">assert_eq!</span>(<span class="string">b""</span>.trim_ascii(), <span class="string">b""</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_floats-1" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/slice/mod.rs.html#4651">source</a><h4 class="code-header">pub fn <a href="#method.sort_floats-1" class="fn">sort_floats</a>(&amp;mut self)</h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>sort_floats</code>)</span></div></span></summary><div class="docblock"><p>Sorts the slice of floats.</p>
<p>This sort is in-place (i.e. does not allocate), <em>O</em>(<em>n</em> * log(<em>n</em>)) worst-case, and uses
the ordering defined by <a href="https://doc.rust-lang.org/nightly/std/primitive.f64.html#method.total_cmp" title="method f64::total_cmp"><code>f64::total_cmp</code></a>.</p>
<h5 id="current-implementation-7"><a class="doc-anchor" href="#current-implementation-7">§</a>Current implementation</h5>
<p>This uses the same sorting algorithm as <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable_by" title="method slice::sort_unstable_by"><code>sort_unstable_by</code></a>.</p>
<h5 id="examples-154"><a class="doc-anchor" href="#examples-154">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(sort_floats)]
</span><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">2.6</span>, -<span class="number">5e-8</span>, f64::NAN, <span class="number">8.29</span>, f64::INFINITY, -<span class="number">1.0</span>, <span class="number">0.0</span>, -f64::INFINITY, -<span class="number">0.0</span>];
v.sort_floats();
<span class="kw">let </span>sorted = [-f64::INFINITY, -<span class="number">1.0</span>, -<span class="number">5e-8</span>, -<span class="number">0.0</span>, <span class="number">0.0</span>, <span class="number">2.6</span>, <span class="number">8.29</span>, f64::INFINITY, f64::NAN];
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>v[..<span class="number">8</span>], <span class="kw-2">&amp;</span>sorted[..<span class="number">8</span>]);
<span class="macro">assert!</span>(v[<span class="number">8</span>].is_nan());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_str" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/ascii/ascii_char.rs.html#560">source</a><h4 class="code-header">pub fn <a href="#method.as_str" class="fn">as_str</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>ascii_char</code>)</span></div></span></summary><div class="docblock"><p>Views this slice of ASCII characters as a UTF-8 <code>str</code>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.as_bytes" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/ascii/ascii_char.rs.html#571">source</a><h4 class="code-header">pub fn <a href="#method.as_bytes" class="fn">as_bytes</a>(&amp;self) -&gt; &amp;[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>] <a href="#" class="tooltip" data-notable-ty="&amp;[u8]">ⓘ</a></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>ascii_char</code>)</span></div></span></summary><div class="docblock"><p>Views this slice of ASCII characters as a slice of <code>u8</code> bytes.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#207-209">source</a></span><h4 class="code-header">pub fn <a href="#method.sort" class="fn">sort</a>(&amp;mut self)<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Sorts the slice.</p>
<p>This sort is stable (i.e., does not reorder equal elements) and <em>O</em>(<em>n</em> * log(<em>n</em>)) worst-case.</p>
<p>When applicable, unstable sorting is preferred because it is generally faster than stable
sorting and it doesn’t allocate auxiliary memory.
See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable" title="method slice::sort_unstable"><code>sort_unstable</code></a>.</p>
<h5 id="current-implementation-8"><a class="doc-anchor" href="#current-implementation-8">§</a>Current implementation</h5>
<p>The current algorithm is an adaptive, iterative merge sort inspired by
<a href="https://en.wikipedia.org/wiki/Timsort">timsort</a>.
It is designed to be very fast in cases where the slice is nearly sorted, or consists of
two or more sorted sequences concatenated one after another.</p>
<p>Also, it allocates temporary storage half the size of <code>self</code>, but for short slices a
non-allocating insertion sort is used instead.</p>
<h5 id="examples-155"><a class="doc-anchor" href="#examples-155">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">3</span>, <span class="number">2</span>];
v.sort();
<span class="macro">assert!</span>(v == [-<span class="number">5</span>, -<span class="number">3</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_by" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#263-265">source</a></span><h4 class="code-header">pub fn <a href="#method.sort_by" class="fn">sort_by</a>&lt;F&gt;(&amp;mut self, compare: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>, <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Sorts the slice with a comparator function.</p>
<p>This sort is stable (i.e., does not reorder equal elements) and <em>O</em>(<em>n</em> * log(<em>n</em>)) worst-case.</p>
<p>The comparator function must define a total ordering for the elements in the slice. If
the ordering is not total, the order of the elements is unspecified. An order is a
total order if it is (for all <code>a</code>, <code>b</code> and <code>c</code>):</p>
<ul>
<li>total and antisymmetric: exactly one of <code>a &lt; b</code>, <code>a == b</code> or <code>a &gt; b</code> is true, and</li>
<li>transitive, <code>a &lt; b</code> and <code>b &lt; c</code> implies <code>a &lt; c</code>. The same must hold for both <code>==</code> and <code>&gt;</code>.</li>
</ul>
<p>For example, while <a href="https://doc.rust-lang.org/nightly/std/primitive.f64.html" title="primitive f64"><code>f64</code></a> doesn’t implement <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord"><code>Ord</code></a> because <code>NaN != NaN</code>, we can use
<code>partial_cmp</code> as our sort function when we know the slice doesn’t contain a <code>NaN</code>.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>floats = [<span class="number">5f64</span>, <span class="number">4.0</span>, <span class="number">1.0</span>, <span class="number">3.0</span>, <span class="number">2.0</span>];
floats.sort_by(|a, b| a.partial_cmp(b).unwrap());
<span class="macro">assert_eq!</span>(floats, [<span class="number">1.0</span>, <span class="number">2.0</span>, <span class="number">3.0</span>, <span class="number">4.0</span>, <span class="number">5.0</span>]);</code></pre></div>
<p>When applicable, unstable sorting is preferred because it is generally faster than stable
sorting and it doesn’t allocate auxiliary memory.
See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable_by" title="method slice::sort_unstable_by"><code>sort_unstable_by</code></a>.</p>
<h5 id="current-implementation-9"><a class="doc-anchor" href="#current-implementation-9">§</a>Current implementation</h5>
<p>The current algorithm is an adaptive, iterative merge sort inspired by
<a href="https://en.wikipedia.org/wiki/Timsort">timsort</a>.
It is designed to be very fast in cases where the slice is nearly sorted, or consists of
two or more sorted sequences concatenated one after another.</p>
<p>Also, it allocates temporary storage half the size of <code>self</code>, but for short slices a
non-allocating insertion sort is used instead.</p>
<h5 id="examples-156"><a class="doc-anchor" href="#examples-156">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [<span class="number">5</span>, <span class="number">4</span>, <span class="number">1</span>, <span class="number">3</span>, <span class="number">2</span>];
v.sort_by(|a, b| a.cmp(b));
<span class="macro">assert!</span>(v == [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);
<span class="comment">// reverse sorting
</span>v.sort_by(|a, b| b.cmp(a));
<span class="macro">assert!</span>(v == [<span class="number">5</span>, <span class="number">4</span>, <span class="number">3</span>, <span class="number">2</span>, <span class="number">1</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_by_key" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.7.0">1.7.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#305-308">source</a></span><h4 class="code-header">pub fn <a href="#method.sort_by_key" class="fn">sort_by_key</a>&lt;K, F&gt;(&amp;mut self, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Sorts the slice with a key extraction function.</p>
<p>This sort is stable (i.e., does not reorder equal elements) and <em>O</em>(<em>m</em> * <em>n</em> * log(<em>n</em>))
worst-case, where the key function is <em>O</em>(<em>m</em>).</p>
<p>For expensive key functions (e.g. functions that are not simple property accesses or
basic operations), <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_cached_key" title="method slice::sort_by_cached_key"><code>sort_by_cached_key</code></a> is likely to be
significantly faster, as it does not recompute element keys.</p>
<p>When applicable, unstable sorting is preferred because it is generally faster than stable
sorting and it doesn’t allocate auxiliary memory.
See <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_unstable_by_key" title="method slice::sort_unstable_by_key"><code>sort_unstable_by_key</code></a>.</p>
<h5 id="current-implementation-10"><a class="doc-anchor" href="#current-implementation-10">§</a>Current implementation</h5>
<p>The current algorithm is an adaptive, iterative merge sort inspired by
<a href="https://en.wikipedia.org/wiki/Timsort">timsort</a>.
It is designed to be very fast in cases where the slice is nearly sorted, or consists of
two or more sorted sequences concatenated one after another.</p>
<p>Also, it allocates temporary storage half the size of <code>self</code>, but for short slices a
non-allocating insertion sort is used instead.</p>
<h5 id="examples-157"><a class="doc-anchor" href="#examples-157">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5i32</span>, <span class="number">4</span>, <span class="number">1</span>, -<span class="number">3</span>, <span class="number">2</span>];
v.sort_by_key(|k| k.abs());
<span class="macro">assert!</span>(v == [<span class="number">1</span>, <span class="number">2</span>, -<span class="number">3</span>, <span class="number">4</span>, -<span class="number">5</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.sort_by_cached_key" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.34.0">1.34.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#352-355">source</a></span><h4 class="code-header">pub fn <a href="#method.sort_by_cached_key" class="fn">sort_by_cached_key</a>&lt;K, F&gt;(&amp;mut self, f: F)<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a>) -&gt; K,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Sorts the slice with a key extraction function.</p>
<p>During sorting, the key function is called at most once per element, by using
temporary storage to remember the results of key evaluation.
The order of calls to the key function is unspecified and may change in future versions
of the standard library.</p>
<p>This sort is stable (i.e., does not reorder equal elements) and <em>O</em>(<em>m</em> * <em>n</em> + <em>n</em> * log(<em>n</em>))
worst-case, where the key function is <em>O</em>(<em>m</em>).</p>
<p>For simple key functions (e.g., functions that are property accesses or
basic operations), <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.sort_by_key" title="method slice::sort_by_key"><code>sort_by_key</code></a> is likely to be
faster.</p>
<h5 id="current-implementation-11"><a class="doc-anchor" href="#current-implementation-11">§</a>Current implementation</h5>
<p>The current algorithm is based on <a href="https://github.com/orlp/pdqsort">pattern-defeating quicksort</a> by Orson Peters,
which combines the fast average case of randomized quicksort with the fast worst case of
heapsort, while achieving linear time on slices with certain patterns. It uses some
randomization to avoid degenerate cases, but with a fixed seed to always provide
deterministic behavior.</p>
<p>In the worst case, the algorithm allocates temporary storage in a <code>Vec&lt;(K, usize)&gt;</code> the
length of the slice.</p>
<h5 id="examples-158"><a class="doc-anchor" href="#examples-158">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>v = [-<span class="number">5i32</span>, <span class="number">4</span>, <span class="number">32</span>, -<span class="number">3</span>, <span class="number">2</span>];
v.sort_by_cached_key(|k| k.to_string());
<span class="macro">assert!</span>(v == [-<span class="number">3</span>, -<span class="number">5</span>, <span class="number">2</span>, <span class="number">32</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.to_vec" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#412-414">source</a></span><h4 class="code-header">pub fn <a href="#method.to_vec" class="fn">to_vec</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Copies <code>self</code> into a new <code>Vec</code>.</p>
<h5 id="examples-159"><a class="doc-anchor" href="#examples-159">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>s = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="kw">let </span>x = s.to_vec();
<span class="comment">// Here, `s` and `x` can be modified independently.</span></code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.to_vec_in" class="method"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#436-438">source</a><h4 class="code-header">pub fn <a href="#method.to_vec_in" class="fn">to_vec_in</a>&lt;A&gt;(&amp;self, alloc: A) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T, A&gt;<div class="where">where
A: <a class="trait" href="https://doc.rust-lang.org/nightly/core/alloc/trait.Allocator.html" title="trait core::alloc::Allocator">Allocator</a>,
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h4></section><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>allocator_api</code>)</span></div><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Copies <code>self</code> into a new <code>Vec</code> with an allocator.</p>
<h5 id="examples-160"><a class="doc-anchor" href="#examples-160">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#![feature(allocator_api)]
</span><span class="kw">use </span>std::alloc::System;
<span class="kw">let </span>s = [<span class="number">10</span>, <span class="number">40</span>, <span class="number">30</span>];
<span class="kw">let </span>x = s.to_vec_in(System);
<span class="comment">// Here, `s` and `x` can be modified independently.</span></code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.repeat" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.40.0">1.40.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#489-491">source</a></span><h4 class="code-header">pub fn <a href="#method.repeat" class="fn">repeat</a>(&amp;self, n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>,</div></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Creates a vector by copying a slice <code>n</code> times.</p>
<h5 id="panics-43"><a class="doc-anchor" href="#panics-43">§</a>Panics</h5>
<p>This function will panic if the capacity would overflow.</p>
<h5 id="examples-161"><a class="doc-anchor" href="#examples-161">§</a>Examples</h5>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>([<span class="number">1</span>, <span class="number">2</span>].repeat(<span class="number">3</span>), <span class="macro">vec!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">2</span>]);</code></pre></div>
<p>A panic upon overflow:</p>
<div class="example-wrap should_panic"><a href="#" class="tooltip" title="This example panics">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="comment">// this will panic at runtime
</span><span class="string">b"0123456789abcdef"</span>.repeat(usize::MAX);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.concat" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#557-559">source</a></span><h4 class="code-header">pub fn <a href="#method.concat" class="fn">concat</a>&lt;Item&gt;(&amp;self) -&gt; &lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a> as <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Concat.html" title="trait alloc::slice::Concat">Concat</a>&lt;Item&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Concat.html#associatedtype.Output" title="type alloc::slice::Concat::Output">Output</a> <a href="#" class="tooltip" data-notable-ty="&lt;[T] as Concat&lt;Item&gt;&gt;::Output">ⓘ</a><div class="where">where
<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Concat.html" title="trait alloc::slice::Concat">Concat</a>&lt;Item&gt;,
Item: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class="docblock"><p>Flattens a slice of <code>T</code> into a single value <code>Self::Output</code>.</p>
<h5 id="examples-162"><a class="doc-anchor" href="#examples-162">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>([<span class="string">"hello"</span>, <span class="string">"world"</span>].concat(), <span class="string">"helloworld"</span>);
<span class="macro">assert_eq!</span>([[<span class="number">1</span>, <span class="number">2</span>], [<span class="number">3</span>, <span class="number">4</span>]].concat(), [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.join" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.3.0">1.3.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#576-578">source</a></span><h4 class="code-header">pub fn <a href="#method.join" class="fn">join</a>&lt;Separator&gt;(
&amp;self,
sep: Separator
) -&gt; &lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a> as <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Join.html" title="trait alloc::slice::Join">Join</a>&lt;Separator&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Join.html#associatedtype.Output" title="type alloc::slice::Join::Output">Output</a> <a href="#" class="tooltip" data-notable-ty="&lt;[T] as Join&lt;Separator&gt;&gt;::Output">ⓘ</a><div class="where">where
<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Join.html" title="trait alloc::slice::Join">Join</a>&lt;Separator&gt;,</div></h4></section></summary><div class="docblock"><p>Flattens a slice of <code>T</code> into a single value <code>Self::Output</code>, placing a
given separator between each.</p>
<h5 id="examples-163"><a class="doc-anchor" href="#examples-163">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>([<span class="string">"hello"</span>, <span class="string">"world"</span>].join(<span class="string">" "</span>), <span class="string">"hello world"</span>);
<span class="macro">assert_eq!</span>([[<span class="number">1</span>, <span class="number">2</span>], [<span class="number">3</span>, <span class="number">4</span>]].join(<span class="kw-2">&amp;</span><span class="number">0</span>), [<span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert_eq!</span>([[<span class="number">1</span>, <span class="number">2</span>], [<span class="number">3</span>, <span class="number">4</span>]].join(<span class="kw-2">&amp;</span>[<span class="number">0</span>, <span class="number">0</span>][..]), [<span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.connect" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#596-598">source</a></span><h4 class="code-header">pub fn <a href="#method.connect" class="fn">connect</a>&lt;Separator&gt;(
&amp;self,
sep: Separator
) -&gt; &lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a> as <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Join.html" title="trait alloc::slice::Join">Join</a>&lt;Separator&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Join.html#associatedtype.Output" title="type alloc::slice::Join::Output">Output</a> <a href="#" class="tooltip" data-notable-ty="&lt;[T] as Join&lt;Separator&gt;&gt;::Output">ⓘ</a><div class="where">where
<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">[T]</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/slice/trait.Join.html" title="trait alloc::slice::Join">Join</a>&lt;Separator&gt;,</div></h4></section><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 1.3.0: renamed to join</span></div></span></summary><div class="docblock"><p>Flattens a slice of <code>T</code> into a single value <code>Self::Output</code>, placing a
given separator between each.</p>
<h5 id="examples-164"><a class="doc-anchor" href="#examples-164">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="macro">assert_eq!</span>([<span class="string">"hello"</span>, <span class="string">"world"</span>].connect(<span class="string">" "</span>), <span class="string">"hello world"</span>);
<span class="macro">assert_eq!</span>([[<span class="number">1</span>, <span class="number">2</span>], [<span class="number">3</span>, <span class="number">4</span>]].connect(<span class="kw-2">&amp;</span><span class="number">0</span>), [<span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">3</span>, <span class="number">4</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.to_ascii_uppercase" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#621">source</a></span><h4 class="code-header">pub fn <a href="#method.to_ascii_uppercase" class="fn">to_ascii_uppercase</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt; <a href="#" class="tooltip" data-notable-ty="Vec&lt;u8&gt;">ⓘ</a></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Returns a vector containing a copy of this slice where each byte
is mapped to its ASCII upper case equivalent.</p>
<p>ASCII letters ‘a’ to ‘z’ are mapped to ‘A’ to ‘Z’,
but non-ASCII letters are unchanged.</p>
<p>To uppercase the value in-place, use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.make_ascii_uppercase" title="method slice::make_ascii_uppercase"><code>make_ascii_uppercase</code></a>.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.to_ascii_lowercase" class="method"><span class="rightside"><span class="since" title="Stable since Rust version 1.23.0">1.23.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/alloc/slice.rs.html#642">source</a></span><h4 class="code-header">pub fn <a href="#method.to_ascii_lowercase" class="fn">to_ascii_lowercase</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt; <a href="#" class="tooltip" data-notable-ty="Vec&lt;u8&gt;">ⓘ</a></h4></section><span class="item-info"><div class="stab portability">Available on <strong>non-<code>no_global_oom_handling</code></strong> only.</div></span></summary><div class="docblock"><p>Returns a vector containing a copy of this slice where each byte
is mapped to its ASCII lower case equivalent.</p>
<p>ASCII letters ‘A’ to ‘Z’ are mapped to ‘a’ to ‘z’,
but non-ASCII letters are unchanged.</p>
<p>To lowercase the value in-place, use <a href="https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.make_ascii_lowercase" title="method slice::make_ascii_lowercase"><code>make_ascii_lowercase</code></a>.</p>
</div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-Clone-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&amp;self) -&gt; <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/clone.rs.html#169">source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;Self</a>)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-Debug-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Deref-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-Deref-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Target" class="associatedtype trait-impl"><a href="#associatedtype.Target" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" class="associatedtype">Target</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="struct" href="struct.QualityItem.html" title="struct actix_web::http::header::QualityItem">QualityItem</a>&lt;<a class="enum" href="enum.Preference.html" title="enum actix_web::http::header::Preference">Preference</a>&lt;<a class="struct" href="struct.LanguageTag.html" title="struct actix_web::http::header::LanguageTag">LanguageTag</a>&gt;&gt;&gt;</h4></section></summary><div class='docblock'>The resulting type after dereferencing.</div></details><details class="toggle method-toggle" open><summary><section id="method.deref" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.deref" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref" class="fn">deref</a>(&amp;self) -&gt; &amp;Self::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a></h4></section></summary><div class='docblock'>Dereferences the value.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-DerefMut-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-DerefMut-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.deref_mut" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.deref_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html#tymethod.deref_mut" class="fn">deref_mut</a>(&amp;mut self) -&gt; &amp;mut Self::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a></h4></section></summary><div class='docblock'>Mutably dereferences the value.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Display-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-Display-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt-1" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.fmt-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Header-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-Header-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.Header.html" title="trait actix_web::http::header::Header">Header</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.name" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.name" class="anchor">§</a><h4 class="code-header">fn <a href="trait.Header.html#tymethod.name" class="fn">name</a>() -&gt; <a class="struct" href="struct.HeaderName.html" title="struct actix_web::http::header::HeaderName">HeaderName</a></h4></section></summary><div class='docblock'>Returns the name of the header field.</div></details><details class="toggle method-toggle" open><summary><section id="method.parse" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.parse" class="anchor">§</a><h4 class="code-header">fn <a href="trait.Header.html#tymethod.parse" class="fn">parse</a>&lt;M: <a class="trait" href="../../trait.HttpMessage.html" title="trait actix_web::HttpMessage">HttpMessage</a>&gt;(msg: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;M</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="enum" href="../../error/enum.ParseError.html" title="enum actix_web::error::ParseError">ParseError</a>&gt;</h4></section></summary><div class='docblock'>Parse the header from a HTTP message.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-PartialEq-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">eq</a>(&amp;self, other: &amp;<a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used
by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/nightly/src/core/cmp.rs.html#263">source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;Rhs</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>This method tests for <code>!=</code>. The default implementation is almost always
sufficient, and should not be overridden without very good reason.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-TryIntoHeaderValue-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-TryIntoHeaderValue-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.TryIntoHeaderValue.html" title="trait actix_web::http::header::TryIntoHeaderValue">TryIntoHeaderValue</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="trait.TryIntoHeaderValue.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="struct" href="struct.InvalidHeaderValue.html" title="struct actix_web::http::header::InvalidHeaderValue">InvalidHeaderValue</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into_value" class="method trait-impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#method.try_into_value" class="anchor">§</a><h4 class="code-header">fn <a href="trait.TryIntoHeaderValue.html#tymethod.try_into_value" class="fn">try_into_value</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="struct" href="struct.HeaderValue.html" title="struct actix_web::http::header::HeaderValue">HeaderValue</a>, Self::<a class="associatedtype" href="trait.TryIntoHeaderValue.html#associatedtype.Error" title="type actix_web::http::header::TryIntoHeaderValue::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Try to convert value to a HeaderValue.</div></details></div></details><section id="impl-Eq-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-Eq-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section><section id="impl-StructuralPartialEq-for-AcceptLanguage" class="impl"><a class="src rightside" href="../../../src/actix_web/http/header/accept_language.rs.html#6-93">source</a><a href="#impl-StructuralPartialEq-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.StructuralPartialEq.html" title="trait core::marker::StructuralPartialEq">StructuralPartialEq</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-AcceptLanguage" class="impl"><a href="#impl-Freeze-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section><section id="impl-RefUnwindSafe-for-AcceptLanguage" class="impl"><a href="#impl-RefUnwindSafe-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section><section id="impl-Send-for-AcceptLanguage" class="impl"><a href="#impl-Send-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section><section id="impl-Sync-for-AcceptLanguage" class="impl"><a href="#impl-Sync-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section><section id="impl-Unpin-for-AcceptLanguage" class="impl"><a href="#impl-Unpin-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section><section id="impl-UnwindSafe-for-AcceptLanguage" class="impl"><a href="#impl-UnwindSafe-for-AcceptLanguage" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.AcceptLanguage.html" title="struct actix_web::http::header::AcceptLanguage">AcceptLanguage</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Equivalent%3CK%3E-for-Q" class="impl"><a href="#impl-Equivalent%3CK%3E-for-Q" class="anchor">§</a><h3 class="code-header">impl&lt;Q, K&gt; Equivalent&lt;K&gt; for Q<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;Q&gt; + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.equivalent" class="method trait-impl"><a href="#method.equivalent" class="anchor">§</a><h4 class="code-header">fn <a class="fn">equivalent</a>(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;K</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Checks if this value is equivalent to the given key. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Equivalent%3CK%3E-for-Q-1" class="impl"><a href="#impl-Equivalent%3CK%3E-for-Q-1" class="anchor">§</a><h3 class="code-header">impl&lt;Q, K&gt; Equivalent&lt;K&gt; for Q<div class="where">where
Q: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
K: <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;Q&gt; + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.equivalent-1" class="method trait-impl"><a href="#method.equivalent-1" class="anchor">§</a><h4 class="code-header">fn <a class="fn">equivalent</a>(&amp;self, key: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;K</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Compare self to <code>key</code> and return <code>true</code> if they are equal.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#768">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Instrument-for-T" class="impl"><a href="#impl-Instrument-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; Instrument for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.instrument" class="method trait-impl"><a href="#method.instrument" class="anchor">§</a><h4 class="code-header">fn <a class="fn">instrument</a>(self, span: Span) -&gt; Instrumented&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the provided [<code>Span</code>], returning an
<code>Instrumented</code> wrapper. <a>Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.in_current_span" class="method trait-impl"><a href="#method.in_current_span" class="anchor">§</a><h4 class="code-header">fn <a class="fn">in_current_span</a>(self) -&gt; Instrumented&lt;Self&gt;</h4></section></summary><div class='docblock'>Instruments this type with the <a href="super::Span::current()">current</a> <a href="crate::Span"><code>Span</code></a>, returning an
<code>Instrumented</code> wrapper. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Same-for-T" class="impl"><a class="src rightside" href="https://docs.rs/typenum/1.17.0/src/typenum/type_operators.rs.html#34">source</a><a href="#impl-Same-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://docs.rs/typenum/1.17.0/typenum/type_operators/trait.Same.html" title="trait typenum::type_operators::Same">Same</a> for T</h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Output" class="associatedtype trait-impl"><a href="#associatedtype.Output" class="anchor">§</a><h4 class="code-header">type <a href="https://docs.rs/typenum/1.17.0/typenum/type_operators/trait.Same.html#associatedtype.Output" class="associatedtype">Output</a> = T</h4></section></summary><div class='docblock'>Should always be <code>Self</code></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#83-85">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#88">source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&amp;self) -&gt; T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/borrow.rs.html#92">source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&amp;self, target: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/nightly/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToString-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2552">source</a><a href="#impl-ToString-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html" title="trait alloc::string::ToString">ToString</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.to_string" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#2558">source</a><a href="#method.to_string" class="anchor">§</a><h4 class="code-header">default fn <a href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html#tymethod.to_string" class="fn">to_string</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></h4></section></summary><div class='docblock'>Converts the given value to a <code>String</code>. <a href="https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html#tymethod.to_string">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-2" class="associatedtype trait-impl"><a href="#associatedtype.Error-2" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/nightly/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryIntoHeaderPair-for-T" class="impl"><a class="src rightside" href="../../../src/actix_http/header/into_pair.rs.html#113">source</a><a href="#impl-TryIntoHeaderPair-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="trait.TryIntoHeaderPair.html" title="trait actix_web::http::header::TryIntoHeaderPair">TryIntoHeaderPair</a> for T<div class="where">where
T: <a class="trait" href="trait.Header.html" title="trait actix_web::http::header::Header">Header</a>,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Error-3" class="associatedtype trait-impl"><a href="#associatedtype.Error-3" class="anchor">§</a><h4 class="code-header">type <a href="trait.TryIntoHeaderPair.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;T as <a class="trait" href="trait.TryIntoHeaderValue.html" title="trait actix_web::http::header::TryIntoHeaderValue">TryIntoHeaderValue</a>&gt;::<a class="associatedtype" href="trait.TryIntoHeaderValue.html#associatedtype.Error" title="type actix_web::http::header::TryIntoHeaderValue::Error">Error</a></h4></section><section id="method.try_into_pair" class="method trait-impl"><a class="src rightside" href="../../../src/actix_http/header/into_pair.rs.html#117">source</a><a href="#method.try_into_pair" class="anchor">§</a><h4 class="code-header">fn <a href="trait.TryIntoHeaderPair.html#tymethod.try_into_pair" class="fn">try_into_pair</a>(
self
) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;(<a class="struct" href="struct.HeaderName.html" title="struct actix_web::http::header::HeaderName">HeaderName</a>, <a class="struct" href="struct.HeaderValue.html" title="struct actix_web::http::header::HeaderValue">HeaderValue</a>), &lt;T as <a class="trait" href="trait.TryIntoHeaderPair.html" title="trait actix_web::http::header::TryIntoHeaderPair">TryIntoHeaderPair</a>&gt;::<a class="associatedtype" href="trait.TryIntoHeaderPair.html#associatedtype.Error" title="type actix_web::http::header::TryIntoHeaderPair::Error">Error</a>&gt;</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-VZip%3CV%3E-for-T" class="impl"><a href="#impl-VZip%3CV%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;V, T&gt; VZip&lt;V&gt; for T<div class="where">where
V: MultiLane&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><section id="method.vzip" class="method trait-impl"><a href="#method.vzip" class="anchor">§</a><h4 class="code-header">fn <a class="fn">vzip</a>(self) -&gt; V</h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-WithSubscriber-for-T" class="impl"><a href="#impl-WithSubscriber-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; WithSubscriber for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_subscriber" class="method trait-impl"><a href="#method.with_subscriber" class="anchor">§</a><h4 class="code-header">fn <a class="fn">with_subscriber</a>&lt;S&gt;(self, subscriber: S) -&gt; WithDispatch&lt;Self&gt;<div class="where">where
S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;Dispatch&gt;,</div></h4></section></summary><div class='docblock'>Attaches the provided <a href="super::Subscriber"><code>Subscriber</code></a> to this type, returning a
[<code>WithDispatch</code>] wrapper. <a>Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.with_current_subscriber" class="method trait-impl"><a href="#method.with_current_subscriber" class="anchor">§</a><h4 class="code-header">fn <a class="fn">with_current_subscriber</a>(self) -&gt; WithDispatch&lt;Self&gt;</h4></section></summary><div class='docblock'>Attaches the current <a href="crate::dispatcher#setting-the-default-subscriber">default</a> <a href="super::Subscriber"><code>Subscriber</code></a> to this type, returning a
[<code>WithDispatch</code>] wrapper. <a>Read more</a></div></details></div></details></div><script type="text/json" id="notable-traits-data">{"&[u8]":"<h3>Notable traits for <code>&amp;[<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</code></h3><pre><code><div class=\"where\">impl <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/std/io/trait.Read.html\" title=\"trait std::io::Read\">Read</a> for &amp;[<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</div>","<[T] as Concat<Item>>::Output":"<h3>Notable traits for <code>&amp;[<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</code></h3><pre><code><div class=\"where\">impl <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/std/io/trait.Read.html\" title=\"trait std::io::Read\">Read</a> for &amp;[<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</div><div class=\"where\">impl <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a> for &amp;mut [<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</div>","<[T] as Join<Separator>>::Output":"<h3>Notable traits for <code>&amp;[<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</code></h3><pre><code><div class=\"where\">impl <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/std/io/trait.Read.html\" title=\"trait std::io::Read\">Read</a> for &amp;[<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</div><div class=\"where\">impl <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a> for &amp;mut [<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>]</div>","Vec<u8>":"<h3>Notable traits for <code><a class=\"struct\" href=\"https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html\" title=\"struct alloc::vec::Vec\">Vec</a>&lt;<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>, A&gt;</code></h3><pre><code><div class=\"where\">impl&lt;A&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/std/io/trait.Write.html\" title=\"trait std::io::Write\">Write</a> for <a class=\"struct\" href=\"https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html\" title=\"struct alloc::vec::Vec\">Vec</a>&lt;<a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.u8.html\">u8</a>, A&gt;<div class=\"where\">where\n A: <a class=\"trait\" href=\"https://doc.rust-lang.org/nightly/core/alloc/trait.Allocator.html\" title=\"trait core::alloc::Allocator\">Allocator</a>,</div></div>"}</script></section></div></main></body></html>
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