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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>empty</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++ Queues</a> &gt; <a href="empty.html">empty</a>  </div>  <div class="name-format">    empty  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;queue&gt;  bool empty() const;</pre>  <p>The empty() function returns true if the queue has no elements,  false otherwise.</p>  <p>For example, the following code uses empty() as the stopping  condition on a <a href= "../keywords/while.html">while</a> loop to  clear a queue while displaying its contents:</p>  <pre class="example-code"> queue&lt;int&gt; q; for( int i = 0; i &lt; 5; i++ ) {   q.push(i); } while( !q.empty() ) {   cout &lt;&lt; q.front() &lt;&lt; endl;   q.pop(); }              </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="size.html">size</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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