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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++ Strings</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;string&gt;  bool empty() const;</pre>  <p>The empty() function returns true if the string has no elements,  false otherwise.</p>  <p>For example:</p>  <pre class="example-code">  string s1;  string s2("");  string s3("This is a string");  cout.setf(ios::boolalpha);  cout &lt;&lt; s1.empty() &lt;&lt; endl;  cout &lt;&lt; s2.empty() &lt;&lt; endl;  cout &lt;&lt; s3.empty() &lt;&lt; endl;</pre>  <p>When run, this code produces the following output:</p>  <pre class="example-output">  true  true  false</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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