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                <h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>equal_to&lt;void&gt;</h1>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="reference_wrapper.html" title="cpp/utility/functional/reference wrapper"><span class="t-lines"><span>reference_wrapper</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></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ref.html" title="cpp/utility/functional/ref"><span class="t-lines"><span>ref</span><span>cref</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Operator wrappers </td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="minus.html" title="cpp/utility/functional/minus"><span class="t-lines"><span>minus</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="negate.html" title="cpp/utility/functional/negate"><span class="t-lines"><span>negate</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="multiplies.html" title="cpp/utility/functional/multiplies"><span class="t-lines"><span>multiplies</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="logical_or.html" title="cpp/utility/functional/logical or"><span class="t-lines"><span>logical_or</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="logical_not.html" title="cpp/utility/functional/logical not"><span class="t-lines"><span>logical_not</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="equal_to.html" title="cpp/utility/functional/equal to"><span class="t-lines"><span>equal_to</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="not_equal_to.html" title="cpp/utility/functional/not equal to"><span class="t-lines"><span>not_equal_to</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="greater" title="cpp/utility/functional/greater"><span class="t-lines"><span>greater</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="less" title="cpp/utility/functional/less"><span class="t-lines"><span>less</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="greater_equal.html" title="cpp/utility/functional/greater equal"><span class="t-lines"><span>greater_equal</span></span></a></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="bit_xor.html" title="cpp/utility/functional/bit xor"><span class="t-lines"><span>bit_xor</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="bit_not.html" title="cpp/utility/functional/bit not"><span class="t-lines"><span>bit_not</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> Negators </td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unary_negate.html" title="cpp/utility/functional/unary negate"><span class="t-lines"><span>unary_negate</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="binary_negate.html" title="cpp/utility/functional/binary negate"><span class="t-lines"><span>binary_negate</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="not1.html" title="cpp/utility/functional/not1"><span class="t-lines"><span>not1</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="not2.html" title="cpp/utility/functional/not2"><span class="t-lines"><span>not2</span></span></a></div></div></td></tr>
</table></div></td></tr>
<p><br />
</p>
<tr class="t-nv-h2"><td colspan="5"> Deprecated binders and adaptors </td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="unary_function.html" title="cpp/utility/functional/unary function"><span class="t-lines"><span>unary_function</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="binary_function.html" title="cpp/utility/functional/binary function"><span class="t-lines"><span>binary_function</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="ptr_fun.html" title="cpp/utility/functional/ptr fun"><span class="t-lines"><span>ptr_fun</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="pointer_to_unary_function.html" title="cpp/utility/functional/pointer to unary function"><span class="t-lines"><span>pointer_to_unary_function</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="pointer_to_binary_function.html" title="cpp/utility/functional/pointer to binary function"><span class="t-lines"><span>pointer_to_binary_function</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="mem_fun.html" title="cpp/utility/functional/mem fun"><span class="t-lines"><span>mem_fun</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="mem_fun_t.html" title="cpp/utility/functional/mem fun t"><span class="t-lines"><span>mem_fun_t</span><span>mem_fun1_t</span><span>const_mem_fun_t</span><span>const_mem_fun1_t</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="mem_fun_ref.html" title="cpp/utility/functional/mem fun ref"><span class="t-lines"><span>mem_fun_ref</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="mem_fun_ref_t.html" title="cpp/utility/functional/mem fun ref t"><span class="t-lines"><span>mem_fun_ref_t</span><span>mem_fun1_ref_t</span><span>const_mem_fun_ref_t</span><span>const_mem_fun1_ref_t</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="binder12.html" title="cpp/utility/functional/binder12"><span class="t-lines"><span>binder1st</span><span>binder2nd</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="bind12.html" title="cpp/utility/functional/bind12"><span class="t-lines"><span>bind1st</span><span>bind2nd</span></span></a></div><div><span class="t-lines"><span><span class="t-mark">(deprecated)</span></span><span><span class="t-mark">(deprecated)</span></span></span></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/utility/functional/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-dsc-header">
<td> <div>Defined in header <code><a href="../../header/functional.html" title="cpp/header/functional">&lt;functional&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 t-since-cxx14">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;&gt;</span><br />
<span class="kw1">class</span> equal_to<span class="sy1">&lt;</span><span class="kw4">void</span><span class="sy1">&gt;</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx14">(since C++14)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="equal_to.html"><span class="kw875">std::<span class="me2">equal_to</span></span></a><span class="sy1">&lt;&gt;</span></span></span> is a specialization of <span class="t-lc"><a href="equal_to.html" title="cpp/utility/functional/equal to">std::equal_to</a></span> with parameter and return type deduced.
</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_functions"><span class="tocnumber">2</span> <span class="toctext">Member functions</span></a></li>
<li class="toclevel-1"><a href="#std::equal_to.3C.3E::operator.28.29"><span class="tocnumber">3</span> <span class="toctext"><span>std::equal_to&lt;&gt;::</span>operator()</span></a>
<ul>
<li class="toclevel-2"><a href="#Parameters"><span class="tocnumber">3.1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-2"><a href="#Return_value"><span class="tocnumber">3.2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-2 tocsection-5"><a href="#Notes"><span class="tocnumber">3.3</span> <span class="toctext">Notes</span></a></li>
<li class="toclevel-2 tocsection-6"><a href="#Example"><span class="tocnumber">3.4</span> <span class="toctext">Example</span></a></li>
</ul>
</li>
</ul>
</td></tr></table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/equal_to_void&amp;action=edit&amp;section=1" 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>is_transparent</code>
</td>
<td>  /* unspecified */
</td></tr>

</table>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/equal_to_void&amp;action=edit&amp;section=2" 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 colspan="2">
</td></tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><strong class="selflink"> <span class="t-lines"><span>operator()</span></span></strong></div></div>
</td>
<td>   tests if the two arguments compare equal <br /> <span class="t-mark">(public member function)</span>
</td></tr>

</table>
<div class="t-member">
<h1> <span class="mw-headline" id="std::equal_to.3C.3E::operator.28.29"> <span style="font-size:0.7em; line-height:130%">std::equal_to&lt;&gt;::</span>operator() </span></h1>
<table class="t-dcl-begin"><tbody>

<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> <span class="kw1">class</span> T, <span class="kw1">class</span> U<span class="sy1">&gt;</span><br />
<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> operator<span class="br0">&#40;</span><span class="br0">&#41;</span><span class="br0">&#40;</span> T<span class="sy3">&amp;&amp;</span> lhs, U<span class="sy3">&amp;&amp;</span> rhs <span class="br0">&#41;</span> <span class="kw4">const</span><br />
</p>
&#160; <span class="sy2">-</span><span class="sy1">&gt;</span> decltype<span class="br0">&#40;</span><a href="../forward.html"><span class="kw913">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>T<span class="sy1">&gt;</span><span class="br0">&#40;</span>lhs<span class="br0">&#41;</span> <span class="sy1">==</span> <a href="../forward.html"><span class="kw913">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;</span><span class="br0">&#40;</span>rhs<span class="br0">&#41;</span><span class="br0">&#41;</span><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>Returns the result of equality comparison between <code>lhs</code> and <code>rhs</code>.
</p>
<h3> <span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  lhs, rhs
</td>
<td> -
</td>
<td>  values to compare
</td></tr></table>
<h3> <span class="mw-headline" id="Return_value">Return value</span></h3>
<p>The result of <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs <span class="sy1">==</span> rhs</span></span>.
</p>
</div>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/equal_to_void&amp;action=edit&amp;section=5" title="Edit section: Notes">edit</a>]</span> <span class="mw-headline" id="Notes">Notes</span></h3>
<p>The member type <code>is_transparent</code> indicates to the caller that this function object is a <i>transparent</i> function object: it accepts arguments of arbitrary types and uses perfect forwarding, which avoids unnecessary copying and conversion when the function object is used in heterogeneous context, or with rvalue arguments. In particular, template functions such as <span class="t-lc"><a href="../../container/set/find.html" title="cpp/container/set/find">std::set::find</a></span> and <span class="t-lc"><a href="../../container/set/lower_bound.html" title="cpp/container/set/lower bound">std::set::lower_bound</a></span> make use of this member type on their <code>Compare</code> types.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/equal_to_void&amp;action=edit&amp;section=6" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style=""><tr><td class="mbox-empty-cell"></td><td class="mbox-text" style="">This section is incomplete<br />Reason: no example </td></tr></table>

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