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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head>  <meta name="generator" content=  "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org">  <title>swap</title>  <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table>  <tr>  <td>  <div class="body-content">  <div class="header-box">    <a href="../index.html">cppreference.com</a> &gt; <a href=    "index.html">C++ Vectors</a> &gt; <a href="swap.html">swap</a>  </div>  <div class="name-format">    swap  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;vector&gt;  void swap( container&amp; from );</pre>  <p>The swap() function exchanges the elements of the current vector  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 contents of two vectors:</p>  <pre class="example-code">  vector<string> v1;  v1.push_back("I'm in v1!");  vector<string> v2;  v2.push_back("And I'm in v2!");  v1.swap(v2);  cout << "The first element in v1 is " << v1.front() << endl;  cout << "The first element in v2 is " << v2.front() << endl;</pre>  <p>The above code displays:</p>  <pre class="example-code">  The first element in v1 is And I'm in v2!  The first element in v2 is I'm in v1!</pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="vector_operators.html">= operator</a><br>    (C++ Lists) <a href="../cpplist/splice.html">splice</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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