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<h2><a name="vector_operators" id="vector_operators">Vector operators</a></h2>
<div class="level2">

<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;">    <span class="co2">#include &lt;vector&gt;</span>
    TYPE<span class="sy0">&amp;</span> operator<span class="br0">&#91;</span><span class="br0">&#93;</span><span class="br0">&#40;</span> size_type index <span class="br0">&#41;</span><span class="sy0">;</span>
    <span class="kw4">const</span> TYPE<span class="sy0">&amp;</span> operator<span class="br0">&#91;</span><span class="br0">&#93;</span><span class="br0">&#40;</span> size_type index <span class="br0">&#41;</span> <span class="kw4">const</span><span class="sy0">;</span>
    vector<span class="sy0">&amp;</span> operator<span class="sy0">=</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span>
    bool operator<span class="sy0">==</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c1<span class="sy0">,</span> <span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span>
    bool operator<span class="sy0">!=</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c1<span class="sy0">,</span> <span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span>
    bool operator<span class="sy0">&lt;</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c1<span class="sy0">,</span> <span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span>
    bool operator<span class="sy0">&gt;</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c1<span class="sy0">,</span> <span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span>
    bool operator<span class="sy0">&lt;=</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c1<span class="sy0">,</span> <span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span>
    bool operator<span class="sy0">&gt;=</span><span class="br0">&#40;</span><span class="kw4">const</span> vector<span class="sy0">&amp;</span> c1<span class="sy0">,</span> <span class="kw4">const</span> vector<span class="sy0">&amp;</span> c2<span class="br0">&#41;</span><span class="sy0">;</span></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" class="wikilink1" title="complexity">linear time</a>.
</p>

<p>
The [] operator runs in <a href="../../complexity.html" class="wikilink1" title="complexity">constant time</a>.
</p>

<p>
Two vectors are equal if:

</p>
<ol>
<li class="level1"><div class="li"> Their size is the same, and</div>
</li>
<li class="level1"><div class="li"> Each member in location i in one vector is equal to the the member in location i in the other vector.</div>
</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="c code c++" style="font-family:monospace;">   vector<span class="sy0">&lt;</span>int<span class="sy0">&gt;</span> v<span class="br0">&#40;</span> 5<span class="sy0">,</span> 1 <span class="br0">&#41;</span><span class="sy0">;</span>
   <span class="kw1">for</span><span class="br0">&#40;</span> <span class="kw4">int</span> i <span class="sy0">=</span> <span class="nu0">0</span><span class="sy0">;</span> i <span class="sy0">&lt;</span> v.<span class="me1">size</span><span class="br0">&#40;</span><span class="br0">&#41;</span><span class="sy0">;</span> i<span class="sy0">++</span> <span class="br0">&#41;</span> <span class="br0">&#123;</span>
     <a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0">&lt;&lt;</span> <span class="st0">&quot;Element &quot;</span> <span class="sy0">&lt;&lt;</span> i <span class="sy0">&lt;&lt;</span> <span class="st0">&quot; is &quot;</span> <span class="sy0">&lt;&lt;</span> v<span class="br0">&#91;</span>i<span class="br0">&#93;</span> <span class="sy0">&lt;&lt;</span> endl<span class="sy0">;</span>
   <span class="br0">&#125;</span></pre>
<p>
Related Topics: <a href="../../stl/vector/at.html" class="wikilink1" title="stl:vector:at">at</a>
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