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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="Source to the Rust file `src/extensions.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>extensions.rs.html -- source</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 source"><!--[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></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"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">any</span>::{<span class="ident">Any</span>, <span class="ident">TypeId</span>};
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashMap</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">hash</span>::{<span class="ident">BuildHasherDefault</span>, <span class="ident">Hasher</span>};
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||
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<span class="kw">struct</span> <span class="ident">IdHasher</span> {
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<span class="ident">id</span>: <span class="ident">u64</span>,
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}
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<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">IdHasher</span> {
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<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">IdHasher</span> {
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||
<span class="ident">IdHasher</span> { <span class="ident">id</span>: <span class="number">0</span> }
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}
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||
}
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||
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||
<span class="kw">impl</span> <span class="ident">Hasher</span> <span class="kw">for</span> <span class="ident">IdHasher</span> {
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||
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bytes</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) {
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||
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">x</span> <span class="kw">in</span> <span class="ident">bytes</span> {
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||
<span class="self">self</span>.<span class="ident">id</span>.<span class="ident">wrapping_add</span>(<span class="ident">u64</span>::<span class="ident">from</span>(<span class="ident">x</span>));
|
||
}
|
||
}
|
||
|
||
<span class="kw">fn</span> <span class="ident">write_u64</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">u</span>: <span class="ident">u64</span>) {
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<span class="self">self</span>.<span class="ident">id</span> <span class="op">=</span> <span class="ident">u</span>;
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||
}
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<span class="kw">fn</span> <span class="ident">finish</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span> {
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<span class="self">self</span>.<span class="ident">id</span>
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||
}
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||
}
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||
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||
<span class="kw">type</span> <span class="ident">AnyMap</span> <span class="op">=</span> <span class="ident">HashMap</span><span class="op"><</span><span class="ident">TypeId</span>, <span class="ident">Box</span><span class="op"><</span><span class="ident">Any</span><span class="op">></span>, <span class="ident">BuildHasherDefault</span><span class="op"><</span><span class="ident">IdHasher</span><span class="op">>></span>;
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<span class="doccomment">/// A type map of request extensions.</span>
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Extensions</span> {
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<span class="ident">map</span>: <span class="ident">AnyMap</span>,
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}
|
||
|
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<span class="kw">impl</span> <span class="ident">Extensions</span> {
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||
<span class="doccomment">/// Create an empty `Extensions`.</span>
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<span class="attribute">#[<span class="ident">inline</span>]</span>
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<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">Extensions</span> {
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<span class="ident">Extensions</span> {
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||
<span class="ident">map</span>: <span class="ident">HashMap</span>::<span class="ident">default</span>(),
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}
|
||
}
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||
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||
<span class="doccomment">/// Insert a type into this `Extensions`.</span>
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||
<span class="doccomment">///</span>
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<span class="doccomment">/// If a extension of this type already existed, it will</span>
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<span class="doccomment">/// be returned.</span>
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">insert</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">val</span>: <span class="ident">T</span>) {
|
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<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">insert</span>(<span class="ident">TypeId</span>::<span class="ident">of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>(), <span class="ident">Box</span>::<span class="ident">new</span>(<span class="ident">val</span>));
|
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}
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||
|
||
<span class="doccomment">/// Get a reference to a type previously inserted on this `Extensions`.</span>
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||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">map</span>
|
||
.<span class="ident">get</span>(<span class="kw-2">&</span><span class="ident">TypeId</span>::<span class="ident">of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>())
|
||
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">boxed</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">boxed</span> <span class="kw">as</span> <span class="kw-2">&</span>(<span class="ident">Any</span> <span class="op">+</span> <span class="lifetime">'static</span>)).<span class="ident">downcast_ref</span>())
|
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}
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||
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||
<span class="doccomment">/// Get a mutable reference to a type previously inserted on this `Extensions`.</span>
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||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span><span class="op">></span> {
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||
<span class="self">self</span>.<span class="ident">map</span>
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||
.<span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="ident">TypeId</span>::<span class="ident">of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>())
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||
.<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">boxed</span><span class="op">|</span> (<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="kw-2">*</span><span class="ident">boxed</span> <span class="kw">as</span> <span class="kw-2">&</span><span class="kw-2">mut</span> (<span class="ident">Any</span> <span class="op">+</span> <span class="lifetime">'static</span>)).<span class="ident">downcast_mut</span>())
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||
}
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||
|
||
<span class="doccomment">/// Remove a type from this `Extensions`.</span>
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<span class="doccomment">///</span>
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<span class="doccomment">/// If a extension of this type existed, it will be returned.</span>
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||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">remove</span><span class="op"><</span><span class="ident">T</span>: <span class="lifetime">'static</span><span class="op">></span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
|
||
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="ident">TypeId</span>::<span class="ident">of</span>::<span class="op"><</span><span class="ident">T</span><span class="op">></span>()).<span class="ident">and_then</span>(<span class="op">|</span><span class="ident">boxed</span><span class="op">|</span> {
|
||
(<span class="ident">boxed</span> <span class="kw">as</span> <span class="ident">Box</span><span class="op"><</span><span class="ident">Any</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span>)
|
||
.<span class="ident">downcast</span>()
|
||
.<span class="ident">ok</span>()
|
||
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">boxed</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">boxed</span>)
|
||
})
|
||
}
|
||
|
||
<span class="doccomment">/// Clear the `Extensions` of all inserted extensions.</span>
|
||
<span class="attribute">#[<span class="ident">inline</span>]</span>
|
||
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
|
||
<span class="self">self</span>.<span class="ident">map</span>.<span class="ident">clear</span>();
|
||
}
|
||
}
|
||
|
||
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Extensions</span> {
|
||
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
|
||
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Extensions"</span>).<span class="ident">finish</span>()
|
||
}
|
||
}
|
||
|
||
<span class="attribute">#[<span class="ident">test</span>]</span>
|
||
<span class="kw">fn</span> <span class="ident">test_extensions</span>() {
|
||
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
|
||
<span class="kw">struct</span> <span class="ident">MyType</span>(<span class="ident">i32</span>);
|
||
|
||
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">extensions</span> <span class="op">=</span> <span class="ident">Extensions</span>::<span class="ident">new</span>();
|
||
|
||
<span class="ident">extensions</span>.<span class="ident">insert</span>(<span class="number">5i32</span>);
|
||
<span class="ident">extensions</span>.<span class="ident">insert</span>(<span class="ident">MyType</span>(<span class="number">10</span>));
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">extensions</span>.<span class="ident">get</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">5i32</span>));
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">extensions</span>.<span class="ident">get_mut</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="number">5i32</span>));
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">extensions</span>.<span class="ident">remove</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(), <span class="prelude-val">Some</span>(<span class="number">5i32</span>));
|
||
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">extensions</span>.<span class="ident">get</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>().<span class="ident">is_none</span>());
|
||
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">extensions</span>.<span class="ident">get</span>::<span class="op"><</span><span class="ident">bool</span><span class="op">></span>(), <span class="prelude-val">None</span>);
|
||
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">extensions</span>.<span class="ident">get</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="ident">MyType</span>(<span class="number">10</span>)));
|
||
}
|
||
</pre>
|
||
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