<!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 `vec` mod in crate `alloc`."><meta name="keywords" content="rust, rustlang, rust-lang, vec"><title>alloc::vec - 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="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></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">☰</div><a href='../../alloc/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><p class='location'>Module vec</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li></ul></div><p class='location'><a href='../index.html'>alloc</a></p><script>window.sidebarCurrent = {name: 'vec', 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="../../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"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Module <a href='../index.html'>alloc</a>::<wbr><a class="mod" href=''>vec</a></span><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'>−</span>]</a></span><a class='srclink' href='../../src/alloc/vec.rs.html#11-2737' title='goto source code'>[src]</a></span></h1><div class='docblock'><p>A contiguous growable array type with heap-allocated contents, written
<code>Vec<T></code>.</p>
<p>Vectors have <code>O(1)</code> indexing, amortized <code>O(1)</code> push (to the end) and
<code>O(1)</code> pop (from the end).</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>You can explicitly create a <a href="../../std/vec/struct.Vec.html"><code>Vec<T></code></a> with <a href="../../std/vec/struct.Vec.html#method.new"><code>new</code></a>:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();</pre>
<p>...or by using the <a href="../../std/macro.vec.html"><code>vec!</code></a> macro:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[];
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>];
<span class="kw">let</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>; <span class="number">10</span>]; <span class="comment">// ten zeroes</span></pre>
<p>You can <a href="../../std/vec/struct.Vec.html#method.push"><code>push</code></a> values onto the end of a vector (which will grow the vector
as needed):</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>];
<span class="ident">v</span>.<span class="ident">push</span>(<span class="number">3</span>);</pre>
<p>Popping values works in much the same way:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>];
<span class="kw">let</span> <span class="ident">two</span> <span class="op">=</span> <span class="ident">v</span>.<span class="ident">pop</span>();</pre>
<p>Vectors also support indexing (through the <a href="../../std/ops/trait.Index.html"><code>Index</code></a> and <a href="../../std/ops/trait.IndexMut.html"><code>IndexMut</code></a> traits):</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
<span class="kw">let</span> <span class="ident">three</span> <span class="op">=</span> <span class="ident">v</span>[<span class="number">2</span>];
<span class="ident">v</span>[<span class="number">1</span>] <span class="op">=</span> <span class="ident">v</span>[<span class="number">1</span>] <span class="op">+</span> <span class="number">5</span>;</pre>
</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
<table>
<tr class=' module-item'>
<td><a class="struct" href="struct.Drain.html"
title='struct alloc::vec::Drain'>Drain</a></td>
<td class='docblock-short'>
<p>A draining iterator for <code>Vec<T></code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.IntoIter.html"
title='struct alloc::vec::IntoIter'>IntoIter</a></td>
<td class='docblock-short'>
<p>An iterator that moves out of a vector.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Splice.html"
title='struct alloc::vec::Splice'>Splice</a></td>
<td class='docblock-short'>
<p>A splicing iterator for <code>Vec</code>.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Vec.html"
title='struct alloc::vec::Vec'>Vec</a></td>
<td class='docblock-short'>
<p>A contiguous growable array type, written <code>Vec<T></code> but pronounced 'vector'.</p>
</td>
</tr>
<tr class='unstable module-item'>
<td><a class="struct" href="struct.DrainFilter.html"
title='struct alloc::vec::DrainFilter'>DrainFilter</a></td>
<td class='docblock-short'>
[<div class='stab unstable'>Experimental</div>] <p>An iterator produced by calling <code>drain_filter</code> on Vec.</p>
</td>
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