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| window.ALL_CRATES = ["fnv","libc","strudel","strudel_st"]; | ||
| //{"start":21,"fragment_lengths":[5,7,10,13]} |
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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="List of all items in this crate"><title>List of all items in this crate</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-405f8b29f52305f8.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="fnv" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0-nightly (04a318787 2024-09-15)" data-channel="nightly" data-search-js="search-0cfde64e8ad3a7fe.js" data-settings-js="settings-7e3bb6c46e92e77c.js" ><script src="../static.files/storage-29b1d5a9048d38fe.js"></script><script defer src="../static.files/main-14659ec02b58af51.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-40f72c9259523cb3.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod sys"><!--[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></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../fnv/index.html">fnv</a><span class="version">1.0.7</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h3><a href="#structs">Crate Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#types" title="Type Aliases">Type Aliases</a></li></ul></section><div id="rustdoc-modnav"></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><h1>List of all items</h1><h3 id="structs">Structs</h3><ul class="all-items"><li><a href="struct.FnvHasher.html">FnvHasher</a></li></ul><h3 id="types">Type Aliases</h3><ul class="all-items"><li><a href="type.FnvBuildHasher.html">FnvBuildHasher</a></li><li><a href="type.FnvHashMap.html">FnvHashMap</a></li><li><a href="type.FnvHashSet.html">FnvHashSet</a></li></ul></section></div></main></body></html> |
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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="An implementation of the Fowler–Noll–Vo hash function."><title>fnv - 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-405f8b29f52305f8.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="fnv" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0-nightly (04a318787 2024-09-15)" data-channel="nightly" data-search-js="search-0cfde64e8ad3a7fe.js" data-settings-js="settings-7e3bb6c46e92e77c.js" ><script src="../static.files/storage-29b1d5a9048d38fe.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-14659ec02b58af51.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-40f72c9259523cb3.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[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></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../fnv/index.html">fnv</a><span class="version">1.0.7</span></h2></div><div class="sidebar-elems"><ul class="block"><li><a id="all-types" href="all.html">All Items</a></li></ul><section id="rustdoc-toc"><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#about" title="About">About</a></li><li><a href="#using-fnv-in-a-hashmap" title="Using FNV in a `HashMap`">Using FNV in a <code>HashMap</code></a></li><li><a href="#using-fnv-in-a-hashset" title="Using FNV in a `HashSet`">Using FNV in a <code>HashSet</code></a></li></ul><h3><a href="#structs">Crate Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#types" title="Type Aliases">Type Aliases</a></li></ul></section><div id="rustdoc-modnav"></div></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>Crate <a class="mod" href="#">fnv</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/fnv/lib.rs.html#1-367">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>An implementation of the <a href="http://www.isthe.com/chongo/tech/comp/fnv/index.html">Fowler–Noll–Vo hash function</a>.</p> | ||
| <h3 id="about"><a class="doc-anchor" href="#about">§</a>About</h3> | ||
| <p>The FNV hash function is a custom <code>Hasher</code> implementation that is more | ||
| efficient for smaller hash keys.</p> | ||
| <p><a href="https://www.rust-lang.org/en-US/faq.html#why-are-rusts-hashmaps-slow">The Rust FAQ states that</a> while the default <code>Hasher</code> implementation, | ||
| SipHash, is good in many cases, it is notably slower than other algorithms | ||
| with short keys, such as when you have a map of integers to other values. | ||
| In cases like these, <a href="https://cglab.ca/~abeinges/blah/hash-rs/">FNV is demonstrably faster</a>.</p> | ||
| <p>Its disadvantages are that it performs badly on larger inputs, and | ||
| provides no protection against collision attacks, where a malicious user | ||
| can craft specific keys designed to slow a hasher down. Thus, it is | ||
| important to profile your program to ensure that you are using small hash | ||
| keys, and be certain that your program could not be exposed to malicious | ||
| inputs (including being a networked server).</p> | ||
| <p>The Rust compiler itself uses FNV, as it is not worried about | ||
| denial-of-service attacks, and can assume that its inputs are going to be | ||
| small—a perfect use case for FNV.</p> | ||
| <h3 id="using-fnv-in-a-hashmap"><a class="doc-anchor" href="#using-fnv-in-a-hashmap">§</a>Using FNV in a <code>HashMap</code></h3> | ||
| <p>The <code>FnvHashMap</code> type alias is the easiest way to use the standard library’s | ||
| <code>HashMap</code> with FNV.</p> | ||
|
|
||
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>fnv::FnvHashMap; | ||
|
|
||
| <span class="kw">let </span><span class="kw-2">mut </span>map = FnvHashMap::default(); | ||
| map.insert(<span class="number">1</span>, <span class="string">"one"</span>); | ||
| map.insert(<span class="number">2</span>, <span class="string">"two"</span>); | ||
|
|
||
| map = FnvHashMap::with_capacity_and_hasher(<span class="number">10</span>, Default::default()); | ||
| map.insert(<span class="number">1</span>, <span class="string">"one"</span>); | ||
| map.insert(<span class="number">2</span>, <span class="string">"two"</span>);</code></pre></div> | ||
| <p>Note, the standard library’s <code>HashMap::new</code> and <code>HashMap::with_capacity</code> | ||
| are only implemented for the <code>RandomState</code> hasher, so using <code>Default</code> to | ||
| get the hasher is the next best option.</p> | ||
| <h3 id="using-fnv-in-a-hashset"><a class="doc-anchor" href="#using-fnv-in-a-hashset">§</a>Using FNV in a <code>HashSet</code></h3> | ||
| <p>Similarly, <code>FnvHashSet</code> is a type alias for the standard library’s <code>HashSet</code> | ||
| with FNV.</p> | ||
|
|
||
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>fnv::FnvHashSet; | ||
|
|
||
| <span class="kw">let </span><span class="kw-2">mut </span>set = FnvHashSet::default(); | ||
| set.insert(<span class="number">1</span>); | ||
| set.insert(<span class="number">2</span>); | ||
|
|
||
| set = FnvHashSet::with_capacity_and_hasher(<span class="number">10</span>, Default::default()); | ||
| set.insert(<span class="number">1</span>); | ||
| set.insert(<span class="number">2</span>);</code></pre></div> | ||
| </div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.FnvHasher.html" title="struct fnv::FnvHasher">FnvHasher</a></div><div class="desc docblock-short">An implementation of the Fowler–Noll–Vo hash function.</div></li></ul><h2 id="types" class="section-header">Type Aliases<a href="#types" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="type" href="type.FnvBuildHasher.html" title="type fnv::FnvBuildHasher">FnvBuild<wbr>Hasher</a></div><div class="desc docblock-short">A builder for default FNV hashers.</div></li><li><div class="item-name"><a class="type" href="type.FnvHashMap.html" title="type fnv::FnvHashMap">FnvHash<wbr>Map</a></div><div class="desc docblock-short">A <code>HashMap</code> using a default FNV hasher.</div></li><li><div class="item-name"><a class="type" href="type.FnvHashSet.html" title="type fnv::FnvHashSet">FnvHash<wbr>Set</a></div><div class="desc docblock-short">A <code>HashSet</code> using a default FNV hasher.</div></li></ul></section></div></main></body></html> |
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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="A builder for default FNV hashers."><title>FnvBuildHasher in fnv - 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-405f8b29f52305f8.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="fnv" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0-nightly (04a318787 2024-09-15)" data-channel="nightly" data-search-js="search-0cfde64e8ad3a7fe.js" data-settings-js="settings-7e3bb6c46e92e77c.js" ><script src="../static.files/storage-29b1d5a9048d38fe.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-14659ec02b58af51.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-40f72c9259523cb3.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc type"><!--[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></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../fnv/index.html">fnv</a><span class="version">1.0.7</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">FnvBuild<wbr>Hasher</a></h2><h3><a href="#aliased-type">Aliased type</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate fnv</a></h2></div></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>Type Alias <a href="index.html">fnv</a>::<wbr><a class="type" href="#">FnvBuildHasher</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/fnv/lib.rs.html#128">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub type FnvBuildHasher = <a class="struct" href="https://doc.rust-lang.org/nightly/core/hash/struct.BuildHasherDefault.html" title="struct core::hash::BuildHasherDefault">BuildHasherDefault</a><<a class="struct" href="struct.FnvHasher.html" title="struct fnv::FnvHasher">FnvHasher</a>>;</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A builder for default FNV hashers.</p> | ||
| </div></details><h2 id="aliased-type" class="section-header">Aliased Type<a href="#aliased-type" class="anchor">§</a></h2><pre class="rust item-decl"><code>struct FnvBuildHasher(<span class="comment">/* private fields */</span>);</code></pre><script src="../type.impl/core/hash/struct.BuildHasherDefault.js" data-self-path="fnv::FnvBuildHasher" async></script></section></div></main></body></html> |
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| </div></details><h2 id="aliased-type" class="section-header">Aliased Type<a href="#aliased-type" class="anchor">§</a></h2><pre class="rust item-decl"><code>struct FnvHashMap<K, V> { <span class="comment">/* private fields */</span> }</code></pre><script src="../type.impl/std/collections/hash/map/struct.HashMap.js" data-self-path="fnv::FnvHashMap" async></script></section></div></main></body></html> |
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