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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 `mem` mod in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, mem"><title>std::mem - 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 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">&#9776;</div><a href='../../std/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><p class='location'>Module mem</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li><li><a href="#unions">Unions</a></li></ul></div><p class='location'><a href='../index.html'>std</a></p><script>window.sidebarCurrent = {name: 'mem', ty: 'mod', 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 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../../src/core/lib.rs.html#173' title='goto source code'>[src]</a></span><span class='in-band'>Module <a href='../index.html'>std</a>::<wbr><a class="mod" href=''>mem</a></span></h1><div class='docblock'><p>Basic functions for dealing with memory.</p>
<p>This module contains functions for querying the size and alignment of
types, initializing and manipulating memory.</p>
</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
<table><tr class='module-item'><td><a class="struct" href="struct.Discriminant.html" title='std::mem::Discriminant struct'>Discriminant</a></td><td class='docblock-short'><p>Opaque type representing the discriminant of an enum.</p>
</td></tr><tr class='module-item'><td><a class="struct" href="struct.ManuallyDrop.html" title='std::mem::ManuallyDrop struct'>ManuallyDrop</a></td><td class='docblock-short'><p>A wrapper to inhibit compiler from automatically calling <code>T</code>’s destructor.</p>
</td></tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
<table><tr class='module-item'><td><a class="fn" href="fn.align_of.html" title='std::mem::align_of fn'>align_of</a></td><td class='docblock-short'><p>Returns the <a href="https://en.wikipedia.org/wiki/Application_binary_interface">ABI</a>-required minimum alignment of a type.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.align_of_val.html" title='std::mem::align_of_val fn'>align_of_val</a></td><td class='docblock-short'><p>Returns the <a href="https://en.wikipedia.org/wiki/Application_binary_interface">ABI</a>-required minimum alignment of the type of the value that <code>val</code> points to.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.discriminant.html" title='std::mem::discriminant fn'>discriminant</a></td><td class='docblock-short'><p>Returns a value uniquely identifying the enum variant in <code>v</code>.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.drop.html" title='std::mem::drop fn'>drop</a></td><td class='docblock-short'><p>Disposes of a value.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.forget.html" title='std::mem::forget fn'>forget</a></td><td class='docblock-short'><p>Takes ownership and &quot;forgets&quot; about the value <strong>without running its destructor</strong>.</p>
</td></tr><tr class='deprecated module-item'><td><a class="fn" href="fn.min_align_of.html" title='std::mem::min_align_of fn'>min_align_of</a></td><td class='docblock-short'><span class="stab deprecated">Deprecated</span><p>Returns the <a href="https://en.wikipedia.org/wiki/Application_binary_interface">ABI</a>-required minimum alignment of a type.</p>
</td></tr><tr class='deprecated module-item'><td><a class="fn" href="fn.min_align_of_val.html" title='std::mem::min_align_of_val fn'>min_align_of_val</a></td><td class='docblock-short'><span class="stab deprecated">Deprecated</span><p>Returns the <a href="https://en.wikipedia.org/wiki/Application_binary_interface">ABI</a>-required minimum alignment of the type of the value that <code>val</code> points to.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.needs_drop.html" title='std::mem::needs_drop fn'>needs_drop</a></td><td class='docblock-short'><p>Returns <code>true</code> if dropping values of type <code>T</code> matters.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.replace.html" title='std::mem::replace fn'>replace</a></td><td class='docblock-short'><p>Moves <code>src</code> into the referenced <code>dest</code>, returning the previous <code>dest</code> value.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.size_of.html" title='std::mem::size_of fn'>size_of</a></td><td class='docblock-short'><p>Returns the size of a type in bytes.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.size_of_val.html" title='std::mem::size_of_val fn'>size_of_val</a></td><td class='docblock-short'><p>Returns the size of the pointed-to value in bytes.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.swap.html" title='std::mem::swap fn'>swap</a></td><td class='docblock-short'><p>Swaps the values at two mutable locations, without deinitializing either one.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.transmute.html" title='std::mem::transmute fn'>transmute</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td><td class='docblock-short'><p>Reinterprets the bits of a value of one type as another type.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.transmute_copy.html" title='std::mem::transmute_copy fn'>transmute_copy</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td><td class='docblock-short'><p>Interprets <code>src</code> as having type <code>&amp;U</code>, and then reads <code>src</code> without moving
the contained value.</p>
</td></tr><tr class='deprecated module-item'><td><a class="fn" href="fn.uninitialized.html" title='std::mem::uninitialized fn'>uninitialized</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td><td class='docblock-short'><span class="stab deprecated">Deprecation planned</span><p>Bypasses Rust's normal memory-initialization checks by pretending to
produce a value of type <code>T</code>, while doing nothing at all.</p>
</td></tr><tr class='module-item'><td><a class="fn" href="fn.zeroed.html" title='std::mem::zeroed fn'>zeroed</a><a title='unsafe function' href='#'><sup>⚠</sup></a></td><td class='docblock-short'><p>Creates a value whose bytes are all zero.</p>
</td></tr><tr class='unstable module-item'><td><a class="fn" href="fn.forget_unsized.html" title='std::mem::forget_unsized fn'>forget_unsized</a></td><td class='docblock-short'><span class="stab unstable">Experimental</span><p>Like <a href="fn.forget.html"><code>forget</code></a>, but also accepts unsized values.</p>
</td></tr></table><h2 id='unions' class='section-header'><a href="#unions">Unions</a></h2>
<table><tr class='unstable module-item'><td><a class="union" href="union.MaybeUninit.html" title='std::mem::MaybeUninit union'>MaybeUninit</a></td><td class='docblock-short'><span class="stab unstable">Experimental</span><p>A wrapper to construct uninitialized instances of <code>T</code>.</p>
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