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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="key_eq.html" title="cpp/container/unordered map/key eq"><span class="t-lines"><span>unordered_map::key_eq</span></span></a></div></div></td></tr>
</table></div><div><span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/unordered_map/navbar_content&amp;action=edit">&#91;edit&#93;</a></span></div></div></div></div><div class="t-navbar-sep">&#160;</div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iterator erase<span class="br0">&#40;</span> const_iterator pos <span class="br0">&#41;</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">iterator erase<span class="br0">&#40;</span> const_iterator first, const_iterator last <span class="br0">&#41;</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp">size_type erase<span class="br0">&#40;</span> <span class="kw4">const</span> key_type<span class="sy3">&amp;</span> key <span class="br0">&#41;</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Removes specified elements from the container. 
</p>
<div class="t-li1"><span class="t-li">1)</span> Removes the element at <code>pos</code>.</div>
<div class="t-li1"><span class="t-li">2)</span> Removes the elements in the range <code>[first; last)</code>.</div>
<div class="t-li1"><span class="t-li">3)</span> Removes all elements with the key value <code>key</code>.</div>
<p>References and iterators to the erased elements are invalidated. Other iterators and references are not invalidated.
</p><p>The iterator <code>pos</code> must be valid and dereferenceable. Thus the <span class="t-lc"><a href="end.html" title="cpp/container/unordered map/end">end()</a></span> iterator (which is valid, but is not dereferencable) cannot be used as a value for <code>pos</code>.
</p>
<table id="toc" class="toc"><tr><td><div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1"><a href="#Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1"><a href="#Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1"><a href="#Exceptions"><span class="tocnumber">3</span> <span class="toctext">Exceptions</span></a></li>
<li class="toclevel-1"><a href="#Complexity"><span class="tocnumber">4</span> <span class="toctext">Complexity</span></a></li>
<li class="toclevel-1"><a href="#See_also"><span class="tocnumber">5</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/erase_assoc&amp;action=edit&amp;section=T-1" title="Template:cpp/container/erase assoc">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  pos
</td>
<td> -
</td>
<td>  iterator to the element to remove
</td></tr>
<tr class="t-par">
<td>  first, last
</td>
<td> -
</td>
<td>  range of elements to remove
</td></tr>
<tr class="t-par">
<td>  key
</td>
<td> -
</td>
<td>  key value of the elements to remove
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/erase_assoc&amp;action=edit&amp;section=T-2" title="Template:cpp/container/erase assoc">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span></h3>
<div class="t-li1"><span class="t-li">1-2)</span> Iterator following the last removed element.</div>
<div class="t-li1"><span class="t-li">3)</span> Number of elements removed.</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/erase_assoc&amp;action=edit&amp;section=T-3" title="Template:cpp/container/erase assoc">edit</a>]</span> <span class="mw-headline" id="Exceptions">Exceptions</span></h3>
<div class="t-li1"><span class="t-li">1,2)</span> (none)</div>
<div class="t-li1"><span class="t-li">3)</span> Any exceptions thrown by the <code>Compare</code> object.</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/erase_assoc&amp;action=edit&amp;section=T-4" title="Template:cpp/container/erase assoc">edit</a>]</span> <span class="mw-headline" id="Complexity">Complexity</span></h3>
<p>Given an instance <code>c</code> of <code>unordered_map</code>:
</p>
<div class="t-li1"><span class="t-li">1)</span> Average case: constant, worst case: <span class="t-c"><span class="mw-geshi cpp source-cpp">c.<span class="me1">size</span><span class="br0">&#40;</span><span class="br0">&#41;</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> Average case: <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../iterator/distance.html"><span class="kw551">std::<span class="me2">distance</span></span></a><span class="br0">&#40;</span>first, last<span class="br0">&#41;</span></span></span>, worst case: <span class="t-c"><span class="mw-geshi cpp source-cpp">c.<span class="me1">size</span><span class="br0">&#40;</span><span class="br0">&#41;</span></span></span></div>
<div class="t-li1"><span class="t-li">3)</span> Average case: <span class="t-c"><span class="mw-geshi cpp source-cpp">c.<span class="me1">count</span><span class="br0">&#40;</span>key<span class="br0">&#41;</span></span></span>, worst case: <span class="t-c"><span class="mw-geshi cpp source-cpp">c.<span class="me1">size</span><span class="br0">&#40;</span><span class="br0">&#41;</span></span></span></div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/erase_assoc&amp;action=edit&amp;section=T-5" title="Template:cpp/container/erase assoc">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">
</td></tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="clear.html" title="cpp/container/unordered map/clear"> <span class="t-lines"><span>clear</span></span></a></div></div>
</td>
<td>   clears the contents  <br /> <span class="t-mark">(public member function)</span> <span class="editsection noprint plainlinks" title="Edit this template"><a rel="nofollow" class="external text" href="http://en.cppreference.com/mwiki/index.php?title=Template:cpp/container/dsc_clear&amp;action=edit">&#91;edit&#93;</a></span>
</td></tr>
</table>

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