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<title>operator==,!=,&lt;,&lt;=,&gt;,&gt;=,&lt;=&gt;(std::chrono::time_point)</title>
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<h1 id="firstHeading" class="firstHeading">operator==,!=,&lt;,&lt;=,&gt;,&gt;=,&lt;=&gt;<small>(std::chrono::time_point)</small></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-chrono.html">chrono</a>&lrm; | <a href="cpp-chrono-time_point.html">time point</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-chrono.html">&lt;chrono&gt;</a></code></div>
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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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
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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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <span class="sy1">&gt;</span><br /></span>
<p><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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><span class="t-mark-rev t-since-cxx14">(C++14 &#36215;)</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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">bool</span> operator<span class="sy1">&lt;=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">bool</span> operator<span class="sy1">&gt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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-cxx11">(C++11 &#36215;)</span><br />
<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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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 rowspan="142">(6)</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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">bool</span> operator<span class="sy1">&gt;=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<span class="sy1">&gt;</span><span class="sy3">&amp;</span> lhs,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<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> Clock, <span class="kw1">class</span> Dur1, <span class="kw1">class</span> Dur2 <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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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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> Clock, <span class="kw1">class</span> Dur1, std<span class="sy4">::</span><span class="me2">three_way_comparable_with</span><span class="sy1">&lt;</span>Dur1<span class="sy1">&gt;</span> Dur2<span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> operator<span class="sy1">&lt;=&gt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur1<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-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1">&lt;</span>Clock,Dur2<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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<p>&#27604;&#36739;&#20108;&#20010;&#26102;&#38388;&#28857;&#12290;&#20197;&#27604;&#36739; <span class="t-lc"><a href="cpp-chrono-time_point-time_since_epoch.html">time_since_epoch()</a></span> &#23545;&#36825;&#20123;&#26102;&#38388;&#28857;&#30340;&#32467;&#26524;&#36827;&#34892;&#27604;&#36739;&#12290;</p>
<div class="t-li1"><span class="t-li">1-2)</span> &#26816;&#26597; time_point <code>lhs</code> &#19982; <code>rhs</code> &#26159;&#21542;&#32473;&#23450;&#26102;&#38047;&#30340;&#21516;&#19968;&#26102;&#38388;&#28857;&#12290;</div>
<div class="t-li1"><span class="t-li">3-6)</span> &#27604;&#36739; time_point <code>lhs</code> &#19982; <code>rhs</code> &#12290;</div>
<div class="t-li1"><span class="t-li">7)</span> &#27604;&#36739; time_point <code>lhs</code> &#19982; <code>rhs</code> &#12290;&#36820;&#22238;&#31867;&#22411;&#20174; <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;=&gt;</span> rhs.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span></span></span> &#25512;&#23548;&#65292;&#20174;&#32780;&#20026; <code>Dur1</code> &#19982; <code>Dur2</code> &#30340;&#19977;&#36335;&#27604;&#36739;&#32467;&#26524;&#31867;&#22411;&#12290;</div>
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<p><code>!=</code> &#36816;&#31639;&#31526;&#20174; <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=".E5.8F.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; time_point</td>
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<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</code> &#19982; <code>rhs</code> &#25351;&#20195;&#21516;&#19968;&#26102;&#38388;&#28857;&#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> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#33509; <code>lhs</code> &#19982; <code>rhs</code> &#25351;&#20195;&#19981;&#21516;&#26102;&#38388;&#28857;&#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> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#33509; <code>lhs</code> &#25351;&#20195;&#30340;&#26102;&#38388;&#28857;<i>&#20808;&#20110;</i> <code>rhs</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> &#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#33509; <code>lhs</code> &#25351;&#20195;&#30340;&#26102;&#38388;&#28857;<i>&#20808;&#20110;</i> <code>rhs</code> &#65292;&#25110;&#25351;&#20195;&#30340;&#26102;&#38388;&#28857;&#19982; <code>rhs</code> &#30456;&#21516;&#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> &#12290;</div>
<div class="t-li1"><span class="t-li">5)</span> &#33509; <code>lhs</code> &#25351;&#20195;&#30340;&#26102;&#38388;&#28857;<i>&#21518;&#20110;</i> <code>rhs</code> &#21017;&#20026; &#65292;&#21542;&#21017;&#20026; <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">6)</span> &#33509; <code>lhs</code> &#25351;&#20195;&#30340;&#26102;&#38388;&#28857;<i>&#21518;&#20110;</i> <code>rhs</code> &#65292;&#25110;&#25351;&#20195;&#30340;&#26102;&#38388;&#28857;&#19982; <code>rhs</code> &#30456;&#21516;&#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> &#12290;</div>
<div class="t-li1"><span class="t-li">7)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;=&gt;</span> rhs.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</div>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#12290;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p><code>time_point</code> &#30340;&#21452;&#36335;&#27604;&#36739;&#36816;&#31639;&#31526;&#26366;&#22312; C++11 &#20013;&#19981;&#26159; <code>constexpr</code> &#65292;&#36825;&#22312; C++14 &#20013;&#26356;&#27491;&#12290;</p>
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