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<code><strong class="selflink"> std::map</strong></code><div class="t-navbar-menu"><div>
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<tr class="t-nv-h1"><td colspan="5"> Member functions</td></tr>
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<tr class="t-nv-h2"><td colspan="5"> Capacity</td></tr>
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<td> <div>Defined in header <code><a href="../header/map.html" title="cpp/header/map">&lt;map&gt;</a></code>
 </div>
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<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> Key,<br>
    <span class="kw1">class</span> T,<br>
    <span class="kw1">class</span> Compare <span class="sy1">=</span> <a href="../utility/functional/less"><span class="kw879">std::<span class="me2">less</span></span></a><span class="sy1">&lt;</span>Key<span class="sy1">&gt;</span>,<br>
    <span class="kw1">class</span> Allocator <span class="sy1">=</span> <a href="../memory/allocator.html"><span class="kw568">std::<span class="me2">allocator</span></span></a><span class="sy1">&lt;</span><a href="../utility/pair.html"><span class="kw901">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span><span class="kw4">const</span> Key, T<span class="sy1">&gt;</span> <span class="sy1">&gt;</span><br>
</p>
<span class="sy1">&gt;</span> <span class="kw1">class</span> map<span class="sy4">;</span></span></div>
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<td></td>
<td></td>
</tr>
</tbody></table> 
<p><code>std::map</code> is a sorted associative container that contains key-value pairs with unique keys. Keys are sorted by using the comparison function <code>Compare</code>.  Search, removal, and insertion operations have logarithmic complexity. Maps are usually implemented as <a href="http://en.wikipedia.com/wiki/Red%E2%80%93black_tree" class="extiw" title="enwiki:Red–black tree">red-black trees</a>.
</p>
<p><code>std::map</code> meets the requirements of <a href="../concept/Container.html" title="cpp/concept/Container"><code>Container</code></a>, <a href="../concept/AllocatorAwareContainer.html" title="cpp/concept/AllocatorAwareContainer"><code>AllocatorAwareContainer</code></a>, <a href="../concept/AssociativeContainer.html" title="cpp/concept/AssociativeContainer"><code>AssociativeContainer</code></a> and <a href="../concept/ReversibleContainer.html" title="cpp/concept/ReversibleContainer"><code>ReversibleContainer</code></a>.
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="#Member_types"><span class="tocnumber">1</span> <span class="toctext">Member types</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="#Member_classes"><span class="tocnumber">2</span> <span class="toctext">Member classes</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="#Iterators"><span class="tocnumber">3.2</span> <span class="toctext">Iterators</span></a></li>
<li class="toclevel-2"><a href="#Capacity"><span class="tocnumber">3.3</span> <span class="toctext">Capacity</span></a></li>
<li class="toclevel-2"><a href="#Modifiers"><span class="tocnumber">3.4</span> <span class="toctext">Modifiers</span></a></li>
<li class="toclevel-2"><a href="#Lookup"><span class="tocnumber">3.5</span> <span class="toctext">Lookup</span></a></li>
<li class="toclevel-2"><a href="#Observers"><span class="tocnumber">3.6</span> <span class="toctext">Observers</span></a></li>
</ul>
</li>
<li class="toclevel-1 tocsection-4"><a href="#Non-member_functions"><span class="tocnumber">4</span> <span class="toctext">Non-member functions</span></a></li>
</ul>
</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>key_type</code>
</td>
<td>  <code>Key</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>mapped_type</code>
</td>
<td>  <code>T</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>value_type</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../utility/pair.html"><span class="kw901">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span><span class="kw4">const</span> Key, T<span class="sy1">&gt;</span></span></span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>size_type</code>
</td>
<td>  Unsigned integral type (usually <span class="t-lc"><a href="../types/size_t.html" title="cpp/types/size t">std::size_t</a></span>) 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>difference_type</code>
</td>
<td>  Signed integer type (usually <span class="t-lc"><a href="../types/ptrdiff_t.html" title="cpp/types/ptrdiff t">std::ptrdiff_t</a></span>) 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>key_compare</code>
</td>
<td>  <code>Compare</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>allocator_type</code>
</td>
<td>  <code>Allocator</code> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>reference</code>
</td>
<td>  <code>Allocator::reference</code> <span class="t-mark-rev t-until-cxx11">(until C++11)</span><br><code>value_type&amp;</code> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>const_reference</code>
</td>
<td>  <code>Allocator::const_reference</code> <span class="t-mark-rev t-until-cxx11">(until C++11)</span><br><code>const value_type&amp;</code> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>pointer</code>
</td>
<td>  <code>Allocator::pointer</code> <span class="t-mark-rev t-until-cxx11">(until C++11)</span><br><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw569">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>Allocator<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">pointer</span></span></span> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>const_pointer</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">Allocator<span class="sy4">::</span><span class="me2">const_pointer</span></span></span> <span class="t-mark-rev t-until-cxx11">(until C++11)</span><br><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../memory/allocator_traits.html"><span class="kw569">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>Allocator<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">const_pointer</span></span></span> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>iterator</code>
</td>
<td>  <a href="../concept/BidirectionalIterator.html" title="cpp/concept/BidirectionalIterator"><code>BidirectionalIterator</code></a> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>const_iterator</code>
</td>
<td>  Constant bidirectional iterator 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw537">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>iterator<span class="sy1">&gt;</span></span></span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <code>const_reverse_iterator</code>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../iterator/reverse_iterator.html"><span class="kw537">std::<span class="me2">reverse_iterator</span></span></a><span class="sy1">&lt;</span>const_iterator<span class="sy1">&gt;</span></span></span> 
</td>
</tr>
</table>
<h3>
<span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php" title="Edit section: Member classes">edit</a>]</span> <span class="mw-headline" id="Member_classes">Member classes</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="map/value_compare.html" title="cpp/container/map/value compare"> <span class="t-lines"><span>value_compare</span></span></a></div></div>
</td>
<td>   compares objects of type <code>value_type</code> <br> <span class="t-mark">(class)</span> 
</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">

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="map/map.html" title="cpp/container/map/map"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td>  constructs the <code>map</code> <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="map/_map.html" title="cpp/container/map/~map"> <span class="t-lines"><span>(destructor)</span></span></a></div></div>
</td>
<td>  destructs the <code>map</code> <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/operator%3d.html" title="cpp/container/map/operator="> <span class="t-lines"><span>operator=</span></span></a></div></div>
</td>
<td>   assigns values to the container  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/get_allocator.html" title="cpp/container/map/get allocator"> <span class="t-lines"><span>get_allocator</span></span></a></div></div>
</td>
<td>   returns the associated allocator  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Element_access">  Element access </span>
</h5>
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/at.html" title="cpp/container/map/at"> <span class="t-lines"><span>at</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>   access specified element with bounds checking  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/operator_at.html" title="cpp/container/map/operator at"> <span class="t-lines"><span>operator[]</span></span></a></div></div>
</td>
<td>   access specified element  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Iterators">  Iterators </span>
</h5>
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/begin.html" title="cpp/container/map/begin"> <span class="t-lines"><span>begin</span><span> cbegin</span></span></a></div>
<div><span class="t-lines"><span></span><span></span></span></div>
</div>
</td>
<td>   returns an iterator to the beginning  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/end.html" title="cpp/container/map/end"> <span class="t-lines"><span>end </span><span>cend</span></span></a></div>
<div><span class="t-lines"><span></span><span></span></span></div>
</div>
</td>
<td>   returns an iterator to the end  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/rbegin.html" title="cpp/container/map/rbegin"> <span class="t-lines"><span>rbegin</span><span> crbegin</span></span></a></div>
<div><span class="t-lines"><span></span><span></span></span></div>
</div>
</td>
<td>   returns a reverse iterator to the beginning  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/rend.html" title="cpp/container/map/rend"> <span class="t-lines"><span>rend</span><span> crend</span></span></a></div>
<div><span class="t-lines"><span></span><span></span></span></div>
</div>
</td>
<td>   returns a reverse iterator to the end  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Capacity">  Capacity </span>
</h5>
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/empty.html" title="cpp/container/map/empty"> <span class="t-lines"><span>empty</span></span></a></div></div>
</td>
<td>   checks whether the container is empty  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/size.html" title="cpp/container/map/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>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/max_size.html" title="cpp/container/map/max size"> <span class="t-lines"><span>max_size</span></span></a></div></div>
</td>
<td>   returns the maximum possible number of elements  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Modifiers">  Modifiers </span>
</h5>
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/clear" title="cpp/container/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> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/insert.html" title="cpp/container/map/insert"> <span class="t-lines"><span>insert</span></span></a></div></div>
</td>
<td>   inserts elements  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/emplace.html" title="cpp/container/map/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  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="map/emplace_hint.html" title="cpp/container/map/emplace hint"> <span class="t-lines"><span>emplace_hint</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 elements in-place using a hint  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/erase.html" title="cpp/container/map/erase"> <span class="t-lines"><span>erase</span></span></a></div></div>
</td>
<td>   erases elements  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/swap.html" title="cpp/container/map/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>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Lookup">  Lookup </span>
</h5>
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/count.html" title="cpp/container/map/count"> <span class="t-lines"><span>count</span></span></a></div></div>
</td>
<td>   returns the number of elements matching specific key  <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/find.html" title="cpp/container/map/find"> <span class="t-lines"><span>find</span></span></a></div></div>
</td>
<td>   finds element with specific key <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/equal_range.html" title="cpp/container/map/equal range"> <span class="t-lines"><span>equal_range</span></span></a></div></div>
</td>
<td>   returns range of elements matching a specific key <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/lower_bound.html" title="cpp/container/map/lower bound"> <span class="t-lines"><span>lower_bound</span></span></a></div></div>
</td>
<td>   returns an iterator to the first element <i>not less</i> than the given value <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/upper_bound.html" title="cpp/container/map/upper bound"> <span class="t-lines"><span>upper_bound</span></span></a></div></div>
</td>
<td>   returns an iterator to the first element <i>greater</i> than a certain value <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id="Observers">  Observers </span>
</h5>
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/key_comp.html" title="cpp/container/map/key comp"> <span class="t-lines"><span>key_comp</span></span></a></div></div>
</td>
<td>   returns the function that compares keys <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="map/value_comp.html" title="cpp/container/map/value comp"> <span class="t-lines"><span>value_comp</span></span></a></div></div>
</td>
<td>   returns the function that compares keys in objects of type value_type <br> <span class="t-mark">(public member function)</span> 
</td>
</tr>
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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>
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<td>  <div class="t-dsc-member-div"><div><a href="map/operator_cmp.html" title="cpp/container/map/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>
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<td>   lexicographically compares the values in the map  <br> <span class="t-mark">(function template)</span> 
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<td>  <div class="t-dsc-member-div"><div><a href="map/swap2.html" title="cpp/container/map/swap2"> <span class="t-lines"><span>std::swap<span class="t-dsc-small">(std::map)</span></span></span></a></div></div>
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<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> 
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