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Deque operators [C++ Reference]
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<h2><a name="deque_operators" id="deque_operators">Deque operators</a></h2>
<div class="level2">
<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <deque></span>
TYPE<span class="sy0">&</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> size_type index <span class="br0">)</span><span class="sy0">;</span>
<span class="kw4">const</span> TYPE<span class="sy0">&</span> operator<span class="br0">[</span><span class="br0">]</span><span class="br0">(</span> size_type index <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span>
deque<span class="sy0">&</span> operator<span class="sy0">=</span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span>
bool operator<span class="sy0">==</span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c1<span class="sy0">,</span> <span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span>
bool operator<span class="sy0">!=</span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c1<span class="sy0">,</span> <span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span>
bool operator<span class="sy0"><</span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c1<span class="sy0">,</span> <span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span>
bool operator<span class="sy0">></span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c1<span class="sy0">,</span> <span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span>
bool operator<span class="sy0"><=</span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c1<span class="sy0">,</span> <span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span>
bool operator<span class="sy0">>=</span><span class="br0">(</span><span class="kw4">const</span> deque<span class="sy0">&</span> c1<span class="sy0">,</span> <span class="kw4">const</span> deque<span class="sy0">&</span> c2<span class="br0">)</span><span class="sy0">;</span></pre>
<p>
All of the C++ containers can be compared and assigned with the standard
comparison operators: ==, !=, ⇐, >=, <, >, and =. Individual elements of a
deque can be examined with the [] operator.
</p>
<p>
Performing a comparison or assigning one deque 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 deques 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 deque is equal to the the member in location i in the other deque.</div>
</li>
</ol>
<p>
Comparisons among deques are done lexicographically.
</p>
<p>
For example, the following code uses the [] operator to access all of the
elements of a deque:
</p>
<pre class="c code c++" style="font-family:monospace;"> deque<span class="sy0"><</span>int<span class="sy0">></span> dq<span class="br0">(</span> 5<span class="sy0">,</span> 1 <span class="br0">)</span><span class="sy0">;</span>
<span class="kw1">for</span><span class="br0">(</span> size_t i <span class="sy0">=</span> <span class="nu0">0</span><span class="sy0">;</span> i <span class="sy0"><</span> dq.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> i<span class="sy0">++</span> <span class="br0">)</span> <span class="br0">{</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"Element "</span> <span class="sy0"><<</span> i <span class="sy0"><<</span> <span class="st0">" is "</span> <span class="sy0"><<</span> dq<span class="br0">[</span>i<span class="br0">]</span> <span class="sy0"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy0">;</span>
<span class="br0">}</span></pre>
<p>
Related Topics: <a href="../../stl/deque/at.html" class="wikilink1" title="stl:deque:at">at</a>
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