| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/ahash-0.7.6/src/specialize.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>specialize.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../ahash/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../ahash/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span>core::hash::BuildHasher; |
| <span class="kw">use </span>core::hash::Hash; |
| <span class="kw">use </span>core::hash::Hasher; |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"std"</span>))] |
| </span><span class="kw">extern crate </span>alloc; |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">extern crate </span>std <span class="kw">as </span>alloc; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::BuildHasherExt; |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">use </span>alloc::string::String; |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">use </span>alloc::vec::Vec; |
| |
| <span class="doccomment">/// Provides a way to get an optimized hasher for a given data type. |
| /// Rather than using a Hasher generically which can hash any value, this provides a way to get a specialized hash |
| /// for a specific type. So this may be faster for primitive types. |
| /// # Example |
| /// ``` |
| /// use std::hash::BuildHasher; |
| /// use ahash::RandomState; |
| /// use ahash::CallHasher; |
| /// |
| /// let hash_builder = RandomState::new(); |
| /// //... |
| /// let value: u32 = 17; |
| /// let hash = u32::get_hash(&value, &hash_builder); |
| /// ``` |
| /// Note that the type used to invoke `get_hash` must be the same a the type of value passed. |
| /// For example get a hasher specialized on `[u8]` can invoke: |
| /// ``` |
| /// /// use std::hash::BuildHasher; |
| /// # use ahash::RandomState; |
| /// # use ahash::CallHasher; |
| /// # let hash_builder = RandomState::new(); |
| /// let bytes: [u8; 4] = [1, 2, 3, 4]; |
| /// let hash = <[u8]>::get_hash(&bytes, &hash_builder); |
| /// ``` |
| </span><span class="kw">pub trait </span>CallHasher { |
| <span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64; |
| } |
| |
| <span class="attribute">#[cfg(not(feature = <span class="string">"specialize"</span>))] |
| </span><span class="kw">impl</span><T> CallHasher <span class="kw">for </span>T |
| <span class="kw">where |
| </span>T: Hash + <span class="question-mark">?</span>Sized, |
| { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>hasher = build_hasher.build_hasher(); |
| value.hash(<span class="kw-2">&mut </span>hasher); |
| hasher.finish() |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl</span><T> CallHasher <span class="kw">for </span>T |
| <span class="kw">where |
| </span>T: Hash + <span class="question-mark">?</span>Sized, |
| { |
| <span class="attribute">#[inline] |
| </span>default <span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>hasher = build_hasher.build_hasher(); |
| value.hash(<span class="kw-2">&mut </span>hasher); |
| hasher.finish() |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>call_hasher_impl { |
| (<span class="macro-nonterminal">$typ</span>:ty) => { |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span><span class="macro-nonterminal">$typ </span>{ |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_u64(value) |
| } |
| } |
| }; |
| } |
| <span class="macro">call_hasher_impl!</span>(u8); |
| <span class="macro">call_hasher_impl!</span>(u16); |
| <span class="macro">call_hasher_impl!</span>(u32); |
| <span class="macro">call_hasher_impl!</span>(u64); |
| <span class="macro">call_hasher_impl!</span>(i8); |
| <span class="macro">call_hasher_impl!</span>(i16); |
| <span class="macro">call_hasher_impl!</span>(i32); |
| <span class="macro">call_hasher_impl!</span>(i64); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>u128 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_fixed_length(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>i128 { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_fixed_length(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>usize { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_fixed_length(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>isize { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_fixed_length(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>[u8] { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_str(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>Vec<u8> { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_str(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>str { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_str(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(feature = <span class="string">"specialize"</span>))] |
| </span><span class="kw">impl </span>CallHasher <span class="kw">for </span>String { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>get_hash<H: Hash + <span class="question-mark">?</span>Sized, B: BuildHasher>(value: <span class="kw-2">&</span>H, build_hasher: <span class="kw-2">&</span>B) -> u64 { |
| build_hasher.hash_as_str(value) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use crate</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| #[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="kw">pub fn </span>test_specialized_invoked() { |
| <span class="kw">let </span>build_hasher = RandomState::with_seeds(<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>shortened = u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher); |
| <span class="kw">let </span><span class="kw-2">mut </span>hasher = AHasher::new_with_keys(<span class="number">1</span>, <span class="number">2</span>); |
| <span class="number">0_u64</span>.hash(<span class="kw-2">&mut </span>hasher); |
| <span class="macro">assert_ne!</span>(hasher.finish(), shortened); |
| } |
| |
| <span class="doccomment">/// Tests that some non-trivial transformation takes place. |
| </span><span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>test_input_processed() { |
| <span class="kw">let </span>build_hasher = RandomState::with_seeds(<span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>, <span class="number">2</span>); |
| <span class="macro">assert_ne!</span>(<span class="number">0</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">1</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">2</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">3</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">4</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">5</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher)); |
| |
| <span class="macro">assert_ne!</span>(<span class="number">0</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">1</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">2</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">3</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">4</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_ne!</span>(<span class="number">5</span>, u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| |
| <span class="kw">let </span>xored = u64::get_hash(<span class="kw-2">&</span><span class="number">0</span>, <span class="kw-2">&</span>build_hasher) ^ u64::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher); |
| <span class="macro">assert_ne!</span>(<span class="number">0</span>, xored); |
| <span class="macro">assert_ne!</span>(<span class="number">1</span>, xored); |
| <span class="macro">assert_ne!</span>(<span class="number">2</span>, xored); |
| <span class="macro">assert_ne!</span>(<span class="number">3</span>, xored); |
| <span class="macro">assert_ne!</span>(<span class="number">4</span>, xored); |
| <span class="macro">assert_ne!</span>(<span class="number">5</span>, xored); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">pub fn </span>test_ref_independent() { |
| <span class="kw">let </span>build_hasher = RandomState::with_seeds(<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>(u8::get_hash(&&<span class="number">1</span>, <span class="kw-2">&</span>build_hasher), u8::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u16::get_hash(&&<span class="number">2</span>, <span class="kw-2">&</span>build_hasher), u16::get_hash(<span class="kw-2">&</span><span class="number">2</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u32::get_hash(&&<span class="number">3</span>, <span class="kw-2">&</span>build_hasher), u32::get_hash(<span class="kw-2">&</span><span class="number">3</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u64::get_hash(&&<span class="number">4</span>, <span class="kw-2">&</span>build_hasher), u64::get_hash(<span class="kw-2">&</span><span class="number">4</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u128::get_hash(&&<span class="number">5</span>, <span class="kw-2">&</span>build_hasher), u128::get_hash(<span class="kw-2">&</span><span class="number">5</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>( |
| str::get_hash(<span class="kw-2">&</span><span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher), |
| str::get_hash(<span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher) |
| ); |
| <span class="macro">assert_eq!</span>( |
| str::get_hash(<span class="kw-2">&</span><span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher), |
| String::get_hash(<span class="kw-2">&</span><span class="string">"test"</span>.to_string(), <span class="kw-2">&</span>build_hasher) |
| ); |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="macro">assert_eq!</span>( |
| str::get_hash(<span class="kw-2">&</span><span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher), |
| <[u8]>::get_hash(<span class="string">"test"</span>.as_bytes(), <span class="kw-2">&</span>build_hasher) |
| ); |
| |
| <span class="kw">let </span>build_hasher = RandomState::with_seeds(<span class="number">10</span>, <span class="number">20</span>, <span class="number">30</span>, <span class="number">40</span>); |
| <span class="macro">assert_eq!</span>(u8::get_hash(&&<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher), u8::get_hash(<span class="kw-2">&</span><span class="number">1</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u16::get_hash(&&<span class="kw-2">&</span><span class="number">2</span>, <span class="kw-2">&</span>build_hasher), u16::get_hash(<span class="kw-2">&</span><span class="number">2</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u32::get_hash(&&<span class="kw-2">&</span><span class="number">3</span>, <span class="kw-2">&</span>build_hasher), u32::get_hash(<span class="kw-2">&</span><span class="number">3</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u64::get_hash(&&<span class="kw-2">&</span><span class="number">4</span>, <span class="kw-2">&</span>build_hasher), u64::get_hash(<span class="kw-2">&</span><span class="number">4</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>(u128::get_hash(&&<span class="kw-2">&</span><span class="number">5</span>, <span class="kw-2">&</span>build_hasher), u128::get_hash(<span class="kw-2">&</span><span class="number">5</span>, <span class="kw-2">&</span>build_hasher)); |
| <span class="macro">assert_eq!</span>( |
| str::get_hash(&&<span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher), |
| str::get_hash(<span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher) |
| ); |
| <span class="macro">assert_eq!</span>( |
| str::get_hash(&&<span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher), |
| String::get_hash(<span class="kw-2">&</span><span class="string">"test"</span>.to_string(), <span class="kw-2">&</span>build_hasher) |
| ); |
| <span class="attribute">#[cfg(feature = <span class="string">"specialize"</span>)] |
| </span><span class="macro">assert_eq!</span>( |
| str::get_hash(&&<span class="string">"test"</span>, <span class="kw-2">&</span>build_hasher), |
| <[u8]>::get_hash(<span class="kw-2">&</span><span class="string">"test"</span>.to_string().into_bytes(), <span class="kw-2">&</span>build_hasher) |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="ahash" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
