<!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 `hash` fn in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, hash"><title>std::ptr::hash - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc fn"><!--[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='../../std/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>ptr</a></p><script>window.sidebarCurrent = {name: 'hash', ty: 'fn', 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="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.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="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.35.0'>1.35.0</span><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/core/ptr.rs.html#2582-2585' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../index.html'>std</a>::<wbr><a href='index.html'>ptr</a>::<wbr><a class="fn" href=''>hash</a></span></h1><pre class='rust fn'>pub fn hash<T, S>(hashee: <a class="primitive" href="../primitive.pointer.html">*const T</a>, into: <a class="primitive" href="../primitive.reference.html">&mut </a>S) <span class="where fmt-newline">where<br> S: <a class="trait" href="../../std/hash/trait.Hasher.html" title="trait std::hash::Hasher">Hasher</a>,<br> T: ?<a class="trait" href="../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></pre><div class='docblock'><p>Hash a raw pointer.</p>
<p>This can be used to hash a <code>&T</code> reference (which coerces to <code>*const T</code> implicitly)
by its address rather than the value it points to
(which is what the <code>Hash for &T</code> implementation does).</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">hash_map</span>::<span class="ident">DefaultHasher</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">hash</span>::{<span class="ident">Hash</span>, <span class="ident">Hasher</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ptr</span>;
<span class="kw">let</span> <span class="ident">five</span> <span class="op">=</span> <span class="number">5</span>;
<span class="kw">let</span> <span class="ident">five_ref</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">five</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hasher</span> <span class="op">=</span> <span class="ident">DefaultHasher</span>::<span class="ident">new</span>();
<span class="ident">ptr</span>::<span class="ident">hash</span>(<span class="ident">five_ref</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">hasher</span>);
<span class="kw">let</span> <span class="ident">actual</span> <span class="op">=</span> <span class="ident">hasher</span>.<span class="ident">finish</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">hasher</span> <span class="op">=</span> <span class="ident">DefaultHasher</span>::<span class="ident">new</span>();
(<span class="ident">five_ref</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">i32</span>).<span class="ident">hash</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">hasher</span>);
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="ident">hasher</span>.<span class="ident">finish</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">actual</span>, <span class="ident">expected</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3Ahash_map%3A%3ADefaultHasher%3B%0Ause%20std%3A%3Ahash%3A%3A%7BHash%2C%20Hasher%7D%3B%0Ause%20std%3A%3Aptr%3B%0A%0Alet%20five%20%3D%205%3B%0Alet%20five_ref%20%3D%20%26five%3B%0A%0Alet%20mut%20hasher%20%3D%20DefaultHasher%3A%3Anew()%3B%0Aptr%3A%3Ahash(five_ref%2C%20%26mut%20hasher)%3B%0Alet%20actual%20%3D%20hasher.finish()%3B%0A%0Alet%20mut%20hasher%20%3D%20DefaultHasher%3A%3Anew()%3B%0A(five_ref%20as%20*const%20i32).hash(%26mut%20hasher)%3B%0Alet%20expected%20%3D%20hasher.finish()%3B%0A%0Aassert_eq!(actual%2C%20expected)%3B%0A%7D">Run</a></pre></div>
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