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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 `rustc_hash` crate."><meta name="keywords" content="rust, rustlang, rust-lang, rustc_hash"><title>rustc_hash - 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><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[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><a href='../rustc_hash/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Crate rustc_hash</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all rustc_hash's items</p></a><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#types">Type Definitions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'rustc_hash', ty: 'mod', relpath: '../'};</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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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='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/rustc_hash/lib.rs.html#11-136' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>rustc_hash</a></span></h1><div class='docblock'><p>Fast, non-cryptographic hash used by rustc and Firefox.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">rustc_hash</span>::<span class="ident">FxHashMap</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">FxHashMap</span><span class="op"><</span><span class="ident">u32</span>, <span class="ident">u32</span><span class="op">></span> <span class="op">=</span> <span class="ident">FxHashMap</span>::<span class="ident">default</span>();
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<span class="ident">map</span>.<span class="ident">insert</span>(<span class="number">22</span>, <span class="number">44</span>);</pre></div>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.FxHasher.html" title='rustc_hash::FxHasher struct'>FxHasher</a></td><td class='docblock-short'><p>A speedy hash algorithm for use within rustc. The hashmap in liballoc
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by default uses SipHash which isn't quite as speedy as we want. In the
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compiler we're not really worried about DOS attempts, so we use a fast
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non-cryptographic hash.</p>
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</td></tr></table><h2 id='types' class='section-header'><a href="#types">Type Definitions</a></h2>
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<table><tr class='module-item'><td><a class="type" href="type.FxHashMap.html" title='rustc_hash::FxHashMap type'>FxHashMap</a></td><td class='docblock-short'><p>Type alias for a hashmap using the <code>fx</code> hash algorithm.</p>
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</td></tr><tr class='module-item'><td><a class="type" href="type.FxHashSet.html" title='rustc_hash::FxHashSet type'>FxHashSet</a></td><td class='docblock-short'><p>Type alias for a hashmap using the <code>fx</code> hash algorithm.</p>
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