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<h1 id="firstHeading" class="firstHeading">operator==,!=,&lt;,&lt;=,&gt;,&gt;=,&lt;=&gt;<small>(std::pair)</small></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-utility.html">utility</a>&lrm; | <a href="cpp-utility-pair.html">pair</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-utility.html">&lt;utility&gt;</a></code></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span></td>
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<td rowspan="142">(2)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<td rowspan="142">(3)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<td rowspan="142">(4)</td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<tr class="t-dcl t-since-cxx14 t-until-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<td rowspan="142">(5)</td>
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<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
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<tr class="t-dcl t-since-cxx14 t-until-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&gt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<td rowspan="142">(6)</td>
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<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br />
<span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs, <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-until-cxx14">(C++14 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-cxx14 t-until-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
</tr>
</tbody>
<tbody>
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<td>
<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="coMULTI">/* see below */</span> operator<span class="sy1">&lt;=&gt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1,T2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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<td>(7)</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div class="t-li1"><span class="t-li">1-2)</span> &#27979;&#35797; lhs &#21644; rhs &#30340;&#20004;&#20010;&#20803;&#32032;&#26159;&#21542;&#22343;&#30456;&#31561;&#65292;&#21363;&#27604;&#36739; <code>lhs.first</code> &#21644; <code>rhs.first</code> &#21450; <code>lhs.second</code> &#21644; <code>rhs.second</code></div>
<div class="t-li1"><span class="t-li">3-6)</span> &#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">&lt;</span></span></span> &#25353;&#23383;&#20856;&#24207;&#27604;&#36739; <code>lhs</code> &#21644; <code>rhs</code> &#65292;&#21363;&#27604;&#36739;&#39318;&#20803;&#32032;&#65292;&#28982;&#21518;&#20165;&#33509;&#23427;&#20204;&#31561;&#20215;&#65292;&#20877;&#27604;&#36739;&#31532;&#20108;&#20803;&#32032;&#12290;</div>
<div class="t-li1"><span class="t-li">7)</span> &#29992;<i>&#21512;&#25104;&#19977;&#36335;&#27604;&#36739;</i>&#25353;&#23383;&#20856;&#24207;&#27604;&#36739; <code>lhs</code> &#21644; <code>rhs</code> &#65292;&#21363;&#27604;&#36739;&#39318;&#20803;&#32032;&#65292;&#28982;&#21518;&#20165;&#33509;&#23427;&#20204;&#31561;&#20215;&#65292;&#20877;&#27604;&#36739;&#31532;&#20108;&#20803;&#32032;&#12290;<br />
&#36820;&#22238;&#31867;&#22411;&#20026; <code>T1</code> &#19982; <code>T2</code> &#19978;&#30340;&#21512;&#25104;&#19977;&#36335;&#27604;&#36739;&#31867;&#22411;&#30340;&#32467;&#26524;&#31867;&#22411;&#30340;<a href="cpp-utility-compare-common_comparison_category.html">&#20849;&#29992;&#27604;&#36739;&#31867;&#21035;&#31867;&#22411;</a>&#12290;</div>
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<p><code>&lt;</code>&#12289; <code>&lt;=</code>&#12289; <code>&gt;</code>&#12289; <code>&gt;=</code> &#21450; <code>!=</code> &#36816;&#31639;&#31526;&#20998;&#21035;&#20174; <code>operator&lt;=&gt;</code> &#19982; <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">&#21512;&#25104;</a>&#12290;</p>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<h3><span class="mw-headline" id=".E5.90.88.E6.88.90.E4.B8.89.E8.B7.AF.E6.AF.94.E8.BE.83">&#21512;&#25104;&#19977;&#36335;&#27604;&#36739;</span></h3>
<p>&#32473;&#23450;&#23545;&#35937;&#31867;&#22411; <code>T</code> &#65292;&#20998;&#21035;&#20316;&#20026;&#24038;&#25805;&#20316;&#25968;&#21644;&#21491;&#25805;&#20316;&#25968;&#30340;&#20108;&#20010; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> T</span></span> &#24038;&#20540; <code>lhs</code> &#19982; <code>rhs</code> &#65292;<i>&#21512;&#25104;&#19977;&#36335;&#27604;&#36739;</i>&#23450;&#20041;&#20026;&#65306;</p>
<ul>
<li>&#33509;&#28385;&#36275; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">three_way_comparable_with</span><span class="sy1">&lt;</span>T, T<span class="sy1">&gt;</span></span></span> &#65292;&#21017;&#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs <span class="sy1">&lt;=&gt;</span> rhs</span></span>;</li>
<li>&#21542;&#21017;&#65292;&#33509;&#20197; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">&lt;</span></span></span> &#27604;&#36739;&#20108;&#20010; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> T</span></span> &#24038;&#20540;&#20026;&#33391;&#26500;&#19988;&#32467;&#26524;&#31867;&#22411;&#28385;&#36275; <i><code>boolean-testable</code></i> &#65292;&#21017;&#31561;&#20215;&#20110;</li>
</ul>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1">lhs <span class="sy1">&lt;</span> rhs <span class="sy4">?</span> std<span class="sy4">::</span><span class="me2">weak_ordering</span><span class="sy4">::</span><span class="me2">less</span> <span class="sy4">:</span>
rhs <span class="sy1">&lt;</span> lhs <span class="sy4">?</span> std<span class="sy4">::</span><span class="me2">weak_ordering</span><span class="sy4">::</span><span class="me2">greater</span> <span class="sy4">:</span>
std<span class="sy4">::</span><span class="me2">weak_ordering</span><span class="sy4">::</span><span class="me2">equivalent</span></pre></div>
</div>
<ul>
<li>&#21542;&#21017;&#19981;&#23450;&#20041;&#21512;&#25104;&#19977;&#36335;&#27604;&#36739;&#65292;&#36825;&#20351;&#24471; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">&lt;=&gt;</span></span></span> &#19981;&#21442;&#19982;&#37325;&#36733;&#20915;&#35758;&#12290;</li>
</ul>
<p>&#33509; <a href="cpp-utility-compare-three_way_comparable.html"><code>three_way_comparable_with</code></a> &#25110; <i><code>boolean-testable</code></i> &#34987;&#28385;&#36275;&#20294;&#26410;&#34987;&#23454;&#29616;&#65292;&#21017; <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">&lt;=&gt;</span></span></span> &#30340;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
</td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>lhs, rhs</td>
<td>-</td>
<td>&#35201;&#27604;&#36739;&#30340; pair</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#33509; <code>lhs.first == rhs.first</code> &#19988; <code>lhs.second == rhs.second</code> &#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span></div>
<div class="t-li1"><span class="t-li">2)</span> <code>!(lhs == rhs)</code></div>
<div class="t-li1"><span class="t-li">3)</span> &#33509; <code>lhs.first&lt;rhs.first</code> &#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#21542;&#21017;&#65292;&#33509; <code>rhs.first&lt;lhs.first</code> &#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;&#21542;&#21017;&#65292;&#33509; <code>lhs.second&lt;rhs.second</code> &#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#21542;&#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> <code>!(rhs &lt; lhs)</code></div>
<div class="t-li1"><span class="t-li">5)</span> <code>rhs &lt; lhs</code></div>
<div class="t-li1"><span class="t-li">6)</span> <code>!(lhs &lt; rhs)</code></div>
<div class="t-li1"><span class="t-li">7)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">synth_three_way<span class="br0">(</span>lhs.<span class="me1">first</span>, rhs.<span class="me1">first</span><span class="br0">)</span></span></span> &#19981;&#31561;&#20110; <code>0</code> &#21017;&#20026;&#23427;&#65292;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">synth_three_way<span class="br0">(</span>lhs.<span class="me1">second</span>, rhs.<span class="me1">second</span><span class="br0">)</span></span></span> &#65292;&#20854;&#20013; <i><code>synth_three_way</code></i> &#26159;&#20165;&#29992;&#20110;&#38416;&#37322;&#30340;&#36827;&#34892;&#21512;&#25104;&#19977;&#36335;&#27604;&#36739;&#30340;&#20989;&#25968;&#23545;&#35937;&#12290;</div>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<p>&#22240;&#20026; operator&lt; &#20026; pair &#23450;&#20041;&#65292;&#25925; pair &#30340;&#23481;&#22120;&#33021;&#25490;&#24207;&#12290;</p>
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;utility&gt;</span>
<span class="co2">#include &lt;vector&gt;</span>
<span class="co2">#include &lt;algorithm&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-container-vector.html"><span class="kw1269">std::<span class="me2">vector</span></span></a><span class="sy1">&lt;</span><a href="cpp-utility-pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span><span class="kw4">int</span>, <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy1">&gt;&gt;</span> v <span class="sy1">=</span> <span class="br0">{</span> <span class="br0">{</span><span class="nu0">2</span>, <span class="st0">&quot;baz&quot;</span><span class="br0">}</span>,
<span class="br0">{</span><span class="nu0">2</span>, <span class="st0">&quot;bar&quot;</span><span class="br0">}</span>,
<span class="br0">{</span><span class="nu0">1</span>, <span class="st0">&quot;foo&quot;</span><span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-algorithm-sort.html"><span class="kw1618">std::<span class="me2">sort</span></span></a><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><span class="kw4">auto</span> p<span class="sy4">:</span> v<span class="br0">)</span> <span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;(&quot;</span> <span class="sy1">&lt;&lt;</span> p.<span class="me1">first</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;,&quot;</span> <span class="sy1">&lt;&lt;</span> p.<span class="me1">second</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;)<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">(1,foo)
(2,bar)
(2,baz)</pre></div>
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