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<code><strong class="selflink"> std::queue</strong></code><div class="t-navbar-menu"><div>
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<td> <div>Defined in header <code><a href="../header/queue.html" title="cpp/header/queue">&lt;queue&gt;</a></code>
 </div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span><br>
<p>    <span class="kw1">class</span> T,<br>
    <span class="kw1">class</span> Container <span class="sy1">=</span> <a href="deque.html"><span class="kw1068">std::<span class="me2">deque</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><br>
</p>
<span class="sy1">&gt;</span> <span class="kw1">class</span> queue<span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody></table> 
<p>The <code>std::queue</code> class is a container adapter that gives the programmer the functionality of a queue - specifically, a FIFO (first-in, first-out) data structure. 
</p>
<p>The class template acts as a wrapper to the underlying container - only a specific set of functions is provided. The queue pushes the elements on the back of the underlying container and pops them from the front.
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="#Template_parameters"><span class="tocnumber">1</span> <span class="toctext">Template parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="#Member_types"><span class="tocnumber">2</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-3">
<a href="#Member_functions"><span class="tocnumber">3</span> <span class="toctext">Member functions</span></a>
<ul>
<li class="toclevel-2"><a href="#Element_access"><span class="tocnumber">3.1</span> <span class="toctext">Element access</span></a></li>
<li class="toclevel-2"><a href="#Capacity"><span class="tocnumber">3.2</span> <span class="toctext">Capacity</span></a></li>
<li class="toclevel-2"><a href="#Modifiers"><span class="tocnumber">3.3</span> <span class="toctext">Modifiers</span></a></li>
</ul>
</li>
<li class="toclevel-1"><a href="#Member_objects"><span class="tocnumber">4</span> <span class="toctext">Member objects</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="#Non-member_functions"><span class="tocnumber">5</span> <span class="toctext">Non-member functions</span></a></li>
<li class="toclevel-1 tocsection-5"><a href="#Helper_classes"><span class="tocnumber">6</span> <span class="toctext">Helper classes</span></a></li>
</ul>
</td></tr></table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Template parameters">edit</a>]</span> <span class="mw-headline" id="Template_parameters">Template parameters</span>
</h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  T
</td>
<td> -
</td>
<td>  The type of the stored elements.
</td>
</tr>
<tr class="t-par">
<td>  Container
</td>
<td> -
</td>
<td>  The type of the underlying container to use to store the elements. The container must satisfy the requirements of <a href="../concept/SequenceContainer.html" title="cpp/concept/SequenceContainer"><code>SequenceContainer</code></a>. Additionally, it must provide the following functions with the usual semantics:
<ul>
<li> <code>back()</code>
</li>
<li> <code>front()</code>
</li>
<li> <code>push_back()</code>
</li>
<li> <code>pop_front()</code>
</li>
</ul>
<p>The standard containers <span class="t-lc"><a href="deque.html" title="cpp/container/deque">std::deque</a></span> and <span class="t-lc"><a href="list.html" title="cpp/container/list">std::list</a></span> satisfy these requirements. 
</p>
</td>
</tr>
</table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Member types">edit</a>]</span> <span class="mw-headline" id="Member_types">Member types</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc-hitem">
<td>  Member type
</td>
<td>  Definition
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>container_type</code>
</td>
<td>  <code>Container</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>value_type</code>
</td>
<td>  <code>Container::value_type</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>size_type</code>
</td>
<td>  <code>Container::size_type</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>reference</code>
</td>
<td>  <code>Container::reference</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>const_reference</code>
</td>
<td>  <code>Container::const_reference</code> 
</td>
</tr>
</table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Member functions">edit</a>]</span> <span class="mw-headline" id="Member_functions">Member functions</span>
</h3>
<table class="t-dsc-begin">

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<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="queue/queue.html" title="cpp/container/queue/queue"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td>  constructs the <code>queue</code> <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="queue/_queue.html" title="cpp/container/queue/~queue"> <span class="t-lines"><span>(destructor)</span></span></a></div></div>
</td>
<td>  destructs the <code>queue</code> <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="queue/operator%3d.html" title="cpp/container/queue/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
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<td>   assigns values to the container adaptor <br> <span class="t-mark">(public member function)</span> 
</td>
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<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Element_access">  Element access </span>
</h5>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/front.html" title="cpp/container/queue/front"> <span class="t-lines"><span>front</span></span></a></div></div>
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<td>   access the first element  <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="queue/back.html" title="cpp/container/queue/back"> <span class="t-lines"><span>back</span></span></a></div></div>
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<td>   access the last element  <br> <span class="t-mark">(public member function)</span> 
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<td colspan="2"> <h5> <span class="mw-headline" id="Capacity">  Capacity </span>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/empty.html" title="cpp/container/queue/empty"> <span class="t-lines"><span>empty</span></span></a></div></div>
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<td>   checks whether the underlying container is empty  <br> <span class="t-mark">(public member function)</span> 
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<td colspan="2">
</td>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/size.html" title="cpp/container/queue/size"> <span class="t-lines"><span>size</span></span></a></div></div>
</td>
<td>   returns the number of elements  <br> <span class="t-mark">(public member function)</span> 
</td>
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<td colspan="2"> <h5> <span class="mw-headline" id="Modifiers">  Modifiers </span>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/push.html" title="cpp/container/queue/push"> <span class="t-lines"><span>push</span></span></a></div></div>
</td>
<td>   inserts element at the end <br> <span class="t-mark">(public member function)</span> 
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<td>  <div class="t-dsc-member-div">
<div><a href="queue/emplace.html" title="cpp/container/queue/emplace"> <span class="t-lines"><span>emplace</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>   constructs element in-place at the end  <br> <span class="t-mark">(public member function)</span> 
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<td colspan="2">
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<td>  <div class="t-dsc-member-div"><div><a href="queue/pop.html" title="cpp/container/queue/pop"> <span class="t-lines"><span>pop</span></span></a></div></div>
</td>
<td>   removes the first element  <br> <span class="t-mark">(public member function)</span> 
</td>
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<td colspan="2">
</td>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/swap.html" title="cpp/container/queue/swap"> <span class="t-lines"><span>swap</span></span></a></div></div>
</td>
<td>   swaps the contents  <br> <span class="t-mark">(public member function)</span> 
</td>
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<td colspan="2"> <h3> <span class="mw-headline" id="Member_objects"> Member objects</span>
</h3>
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<td>  <div class="t-dsc-member-div"><div>
<span class="t-dsc-small">Container</span> c</div></div>
</td>
<td>   the underlying container <br> <span class="t-mark">(protected member object)</span> 
</td>
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<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Non-member functions">edit</a>]</span> <span class="mw-headline" id="Non-member_functions">Non-member functions</span>
</h3>
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</td>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/operator_cmp.html" title="cpp/container/queue/operator cmp"> <span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span></span></a></div></div>
</td>
<td>   lexicographically compares the values in the queue  <br> <span class="t-mark">(function template)</span> 
</td>
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<td>  <div class="t-dsc-member-div"><div><a href="queue/swap2.html" title="cpp/container/queue/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::queue)</span></span></span></a></div></div>
</td>
<td>   specializes the <span class="t-lc"><a href="../algorithm/swap.html" title="cpp/algorithm/swap">std::swap</a></span> algorithm  <br> <span class="t-mark">(function template)</span> 
</td>
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</table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Helper classes">edit</a>]</span> <span class="mw-headline" id="Helper_classes">Helper classes</span>
</h3>
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<td>  <div class="t-dsc-member-div">
<div><a href="queue/uses_allocator.html" title="cpp/container/queue/uses allocator"> <span class="t-lines"><span>std::uses_allocator<span class="t-dsc-small">&lt;std::queue&gt;</span></span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>   specializes the <span class="t-lc"><a href="../memory/uses_allocator.html" title="cpp/memory/uses allocator">std::uses_allocator</a></span> type trait  <br> <span class="t-mark">(function template)</span> 
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