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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
    "index.html">C++ Double-ended Queues</a> &gt; <a href=
    "swap.html">swap</a>
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    swap
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    Syntax:
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  <pre class="syntax-box">
  #include &lt;deque&gt;
  void swap( container&amp; from );
</pre>

  <p>The swap() function exchanges the elements of the current dequeue
  with those of <em>from</em>. This function operates in <a href=
  "../complexity.html">constant time</a>.</p>

  <p>For example, the following code uses the swap() function to
  exchange the values of two strings:</p>
<pre class="prettyprint">
   string first( &quot;This comes first&quot; );
   string second( &quot;And this is second&quot; );
   first.swap( second );
   cout &lt;&lt; first &lt;&lt; endl;
   cout &lt;&lt; second &lt;&lt; endl;
</pre>

  <p>The above code displays:</p>
<pre class="prettyprint">
   And this is second
   This comes first
</pre>

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    (C++ Lists) <a href="../cpplist/splice.html">splice</a>
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