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<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'>std</a></p><script>window.sidebarCurrent = {name: 'vec', ty: 'mod', relpath: '../'};</script><script defer src="../sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Module <a href='../index.html'>std</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/lib.rs.html#185' 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>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20v%3A%20Vec%3Ci32%3E%20%3D%20Vec%3A%3Anew()%3B%0A%7D">Run</a></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><a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20v%3A%20Vec%3Ci32%3E%20%3D%20vec!%5B%5D%3B%0A%0Alet%20v%20%3D%20vec!%5B1%2C%202%2C%203%2C%204%2C%205%5D%3B%0A%0Alet%20v%20%3D%20vec!%5B0%3B%2010%5D%3B%20%2F%2F%20ten%20zeroes%0A%7D">Run</a></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>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20mut%20v%20%3D%20vec!%5B1%2C%202%5D%3B%0A%0Av.push(3)%3B%0A%7D">Run</a></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>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20mut%20v%20%3D%20vec!%5B1%2C%202%5D%3B%0A%0Alet%20two%20%3D%20v.pop()%3B%0A%7D">Run</a></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>;<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20mut%20v%20%3D%20vec!%5B1%2C%202%2C%203%5D%3B%0Alet%20three%20%3D%20v%5B2%5D%3B%0Av%5B1%5D%20%3D%20v%5B1%5D%20%2B%205%3B%0A%7D">Run</a></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 std::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 std::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 std::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 std::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 std::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>
</tr>
<tr class='unstable module-item'>
<td><a class="struct" href="struct.PlaceBack.html"
title='struct std::vec::PlaceBack'>PlaceBack</a></td>
<td class='docblock-short'>
[<div class='stab unstable'>Experimental</div>] <p>A place for insertion at the back of a <code>Vec</code>.</p>
</td>
</tr></table></section>
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