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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>Vector operators</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=    "vector_operators.html">Vector operators</a>  </div>  <div class="name-format">    Vector operators  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;vector&gt;  <a href="../containers.html">TYPE</a>&amp; operator[]( <strong>size_type</strong> index );  const <a href="../containers.html">TYPE</a>&amp; operator[]( <strong>size_type</strong> index ) const;  vector operator=(const vector&amp; c2);  bool operator==(const vector&amp; c1, const vector&amp; c2);  bool operator!=(const vector&amp; c1, const vector&amp; c2);  bool operator&lt;(const vector&amp; c1, const vector&amp; c2);  bool operator&gt;(const vector&amp; c1, const vector&amp; c2);  bool operator&lt;=(const vector&amp; c1, const vector&amp; c2);  bool operator&gt;=(const vector&amp; c1, const vector&amp; c2);</pre>  <p>All of the C++ containers can be compared and assigned with the  standard comparison operators: ==, !=, &lt;=, &gt;=, &lt;, &gt;, and  =. Individual elements of a vector can be examined with the []  operator.</p>  <p>Performing a comparison or assigning one vector to another takes  <a href="../complexity.html">linear time</a>. The [] operator runs in  <a href="../complexity.html">constant time</a>.</p>  <p>Two vectors are equal if:</p>  <ol>    <li>Their size is the same, and</li>    <li>Each member in location i in one vector is equal to the the    member in location i in the other vector.</li>  </ol>  <p>Comparisons among vectors are done lexicographically.</p>  <p>For example, the following code uses the [] operator to access all  of the elements of a vector:</p>  <pre class="example-code"> vector&lt;int&gt; v( 5, 1 ); for( int i = 0; i &lt; v.size(); i++ ) {   cout &lt;&lt; &quot;Element &quot; &lt;&lt; i &lt;&lt; &quot; is &quot; &lt;&lt; v[i] &lt;&lt; endl; }              </pre>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="at.html">at</a>  </div>  </div>  </td>    </tr>  </table></body></html>
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