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<h2><a name="swap" id="swap">swap</a></h2>
<div class="level2">

<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;">    <span class="co2">#include &lt;vector&gt;</span>
    <span class="kw4">void</span> swap<span class="br0">&#40;</span> vector<span class="sy0">&amp;</span> from <span class="br0">&#41;</span><span class="sy0">;</span></pre>
<p>
The swap() function exchanges the elements of the current vector with those of
from. This function operates in <a href="../../complexity.html" class="wikilink1" title="complexity">constant time</a>.
</p>

<p>
For example, the following code uses the swap() function to exchange the
contents of two vectors:
</p>
<pre class="c code c++" style="font-family:monospace;">    vector<span class="sy0">&lt;</span>string<span class="sy0">&gt;</span> v1<span class="sy0">;</span>
    v1.<span class="me1">push_back</span><span class="br0">&#40;</span><span class="st0">&quot;I'm in v1!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    vector<span class="sy0">&lt;</span>string<span class="sy0">&gt;</span> v2<span class="sy0">;</span>
    v2.<span class="me1">push_back</span><span class="br0">&#40;</span><span class="st0">&quot;And I'm in v2!&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    v1.<span class="me1">swap</span><span class="br0">&#40;</span>v2<span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
    <a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0">&lt;&lt;</span> <span class="st0">&quot;The first element in v1 is &quot;</span> <span class="sy0">&lt;&lt;</span> v1.<span class="me1">front</span><span class="br0">&#40;</span><span class="br0">&#41;</span> <span class="sy0">&lt;&lt;</span> endl<span class="sy0">;</span>
    <a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0">&lt;&lt;</span> <span class="st0">&quot;The first element in v2 is &quot;</span> <span class="sy0">&lt;&lt;</span> v2.<span class="me1">front</span><span class="br0">&#40;</span><span class="br0">&#41;</span> <span class="sy0">&lt;&lt;</span> endl<span class="sy0">;</span></pre>
<p>
The above code displays:
</p>
<pre class="code">
    The first element in v1 is And I'm in v2!
    The first element in v2 is I'm in v1!</pre>
<p>
Related Topics: <a href="../../stl/vector/operator.html" class="wikilink1" title="stl:vector:vector_operators">= operator</a>
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