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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="API documentation for the Rust `State` struct in crate `actix_web`."><meta name="keywords" content="rust, rustlang, rust-lang, State"><title>actix_web::State - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script></head><body class="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><p class='location'>Struct State</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Deref">Deref</a><a href="#impl-FromRequest%3CS%3E">FromRequest<S></a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a></div></div><p class='location'><a href='index.html'>actix_web</a></p><script>window.sidebarCurrent = {name: 'State', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>actix_web</a>::<wbr><a class="struct" href=''>State</a></span><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/actix_web/handler.rs.html#543' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct State<S>(_);</pre></div><div class='docblock'><p>Access an application state</p>
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<p><code>S</code> - application state type</p>
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<h2 id="example" class="section-header"><a href="#example">Example</a></h2>
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<pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">serde_derive</span>;
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<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>, <span class="ident">App</span>, <span class="ident">Path</span>, <span class="ident">State</span>};
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<span class="doccomment">/// Application state</span>
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<span class="kw">struct</span> <span class="ident">MyApp</span> {
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<span class="ident">msg</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>,
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}
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Deserialize</span>)]</span>
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<span class="kw">struct</span> <span class="ident">Info</span> {
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<span class="ident">username</span>: <span class="ident">String</span>,
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}
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<span class="doccomment">/// extract path info using serde</span>
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<span class="kw">fn</span> <span class="ident">index</span>(<span class="ident">data</span>: (<span class="ident">State</span><span class="op"><</span><span class="ident">MyApp</span><span class="op">></span>, <span class="ident">Path</span><span class="op"><</span><span class="ident">Info</span><span class="op">></span>)) <span class="op">-></span> <span class="ident">String</span> {
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<span class="kw">let</span> (<span class="ident">state</span>, <span class="ident">path</span>) <span class="op">=</span> <span class="ident">data</span>;
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<span class="macro">format</span><span class="macro">!</span>(<span class="string">"{} {}!"</span>, <span class="ident">state</span>.<span class="ident">msg</span>, <span class="ident">path</span>.<span class="ident">username</span>)
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}
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">app</span> <span class="op">=</span> <span class="ident">App</span>::<span class="ident">with_state</span>(<span class="ident">MyApp</span> { <span class="ident">msg</span>: <span class="string">"Welcome"</span> }).<span class="ident">resource</span>(
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<span class="string">"/{username}/index.html"</span>, <span class="comment">// <- define path parameters</span>
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<span class="op">|</span><span class="ident">r</span><span class="op">|</span> <span class="ident">r</span>.<span class="ident">method</span>(<span class="ident">http</span>::<span class="ident">Method</span>::<span class="ident">GET</span>).<span class="ident">with</span>(<span class="ident">index</span>),
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); <span class="comment">// <- use `with` extractor</span>
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}</pre>
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</div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<div id='implementations-list'><h3 id='impl-Deref' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<S> <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="../actix_web/struct.State.html" title="struct actix_web::State">State</a><S></code><a href='#impl-Deref' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/handler.rs.html#545-551' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Target' class="type"><span id='Target.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target' class="type">Target</a> = S</code></span></h4>
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<div class='docblock'><p>The resulting type after dereferencing.</p>
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</div><h4 id='method.deref' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R</h3><code class="content"><span class="where fmt-newline">impl<'a, R> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<'a, W> <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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>W <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<'a, I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='deref.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>S</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/handler.rs.html#548-550' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Dereferences the value.</p>
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</div></div><h3 id='impl-FromRequest%3CS%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<S> <a class="trait" href="../actix_web/trait.FromRequest.html" title="trait actix_web::FromRequest">FromRequest</a><S> for <a class="struct" href="../actix_web/struct.State.html" title="struct actix_web::State">State</a><S></code><a href='#impl-FromRequest%3CS%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/handler.rs.html#553-561' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='associatedtype.Config' class="type"><span id='Config.t' class='invisible'><code>type <a href='../actix_web/trait.FromRequest.html#associatedtype.Config' class="type">Config</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a></code></span></h4>
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<div class='docblock'><p>Configuration for conversion process</p>
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</div><h4 id='associatedtype.Result' class="type"><span id='Result.t' class='invisible'><code>type <a href='../actix_web/trait.FromRequest.html#associatedtype.Result' class="type">Result</a> = <a class="struct" href="../actix_web/struct.State.html" title="struct actix_web::State">State</a><S></code></span></h4>
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<div class='docblock'><p>Future that resolves to a Self</p>
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</div><h4 id='method.from_request' class="method"><span id='from_request.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../actix_web/trait.FromRequest.html#tymethod.from_request' class='fnname'>from_request</a>(req: &<a class="struct" href="../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>, _: &Self::<a class="type" href="../actix_web/trait.FromRequest.html#associatedtype.Config" title="type actix_web::FromRequest::Config">Config</a>) -> Self::<a class="type" href="../actix_web/trait.FromRequest.html#associatedtype.Result" title="type actix_web::FromRequest::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/handler.rs.html#558-560' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Convert request to a Self</p>
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</div><h4 id='method.extract' class="method"><span id='extract.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../actix_web/trait.FromRequest.html#method.extract' class='fnname'>extract</a>(req: &<a class="struct" href="../actix_web/struct.HttpRequest.html" title="struct actix_web::HttpRequest">HttpRequest</a><S>) -> Self::<a class="type" href="../actix_web/trait.FromRequest.html#associatedtype.Result" title="type actix_web::FromRequest::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/actix_web/handler.rs.html#55-57' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Convert request to a Self <a href="../actix_web/trait.FromRequest.html#method.extract">Read more</a></p>
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</div></div></div>
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<h2 id='synthetic-implementations' class='small-section-header'>
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Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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</h2>
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<div id='synthetic-implementations-list'>
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<h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<S> !<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="../actix_web/struct.State.html" title="struct actix_web::State">State</a><S></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<S> !<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="../actix_web/struct.State.html" title="struct actix_web::State">State</a><S></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "actix_web";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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