<!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 `eq` fn in crate `core`."> <meta name="keywords" content="rust, rustlang, rust-lang, eq"> <title>core::ptr::eq - 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="../../main.css" id="themeStyle"> <script src="../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </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='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> <p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>ptr</a></p><script>window.sidebarCurrent = {name: 'eq', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script> </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"> </div> </form> </nav> <section id='main' class="content"> <h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>core</a>::<wbr><a href='index.html'>ptr</a>::<wbr><a class="fn" href=''>eq</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.17.0'>1.17.0</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#2155-2157' title='goto source code'>[src]</a></span></h1> <pre class='rust fn'>pub fn eq<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(a: *const T, b: *const T) -> bool</pre><div class='docblock'><p>Compare raw pointers for equality.</p> <p>This is the same as using the <code>==</code> operator, but less generic: the arguments have to be <code>*const T</code> raw pointers, not anything that implements <code>PartialEq</code>.</p> <p>This can be used to compare <code>&T</code> references (which coerce to <code>*const T</code> implicitly) by their address rather than comparing the values they point to (which is what the <code>PartialEq for &T</code> implementation does).</p> <h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1> <pre class="rust rust-example-rendered"> <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">other_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="ident">same_five_ref</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">five</span>; <span class="kw">let</span> <span class="ident">other_five_ref</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">other_five</span>; <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">five_ref</span> <span class="op">==</span> <span class="ident">same_five_ref</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">five_ref</span> <span class="op">==</span> <span class="ident">other_five_ref</span>); <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">ptr</span>::<span class="ident">eq</span>(<span class="ident">five_ref</span>, <span class="ident">same_five_ref</span>)); <span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">ptr</span>::<span class="ident">eq</span>(<span class="ident">five_ref</span>, <span class="ident">other_five_ref</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%3Aptr%3B%0A%0Alet%20five%20%3D%205%3B%0Alet%20other_five%20%3D%205%3B%0Alet%20five_ref%20%3D%20%26five%3B%0Alet%20same_five_ref%20%3D%20%26five%3B%0Alet%20other_five_ref%20%3D%20%26other_five%3B%0A%0Aassert!(five_ref%20%3D%3D%20same_five_ref)%3B%0Aassert!(five_ref%20%3D%3D%20other_five_ref)%3B%0A%0Aassert!(ptr%3A%3Aeq(five_ref%2C%20same_five_ref))%3B%0Aassert!(!ptr%3A%3Aeq(five_ref%2C%20other_five_ref))%3B%0A%7D">Run</a></pre> </div></section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all sections</dd> <dt><kbd>-</kbd></dt> <dd>Collapse all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../"; 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