74 lines
5.6 KiB
HTML
74 lines
5.6 KiB
HTML
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<title>std::chrono::operator==(std::chrono::year_month_weekday_last)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>operator==<span style="font-size:0.7em; line-height:130%">(std::chrono::year_month_weekday_last)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a>‎ | <a href="cpp-chrono-year_month_weekday_last.html">year month weekday last</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-chrono.html"><chrono></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span><span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">year_month_weekday_last</span><span class="sy3">&</span> x,<br />
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<span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">year_month_weekday_last</span><span class="sy3">&</span> y<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>比较二个 <code>year_month_weekday_last</code> 值 <code>x</code> 与 <code>y</code> 。</p>
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<p><code>!=</code> 运算符从 <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">合成</a>。</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp">x.<span class="me1">year</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> y.<span class="me1">year</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&&</span> x.<span class="me1">month</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> y.<span class="me1">month</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&&</span> x.<span class="me1">weekday</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> y.<span class="me1">weekday</span><span class="br0">(</span><span class="br0">)</span></span></span></p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <chrono></span>
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<span class="kw1">using</span> <span class="kw1">namespace</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">constexpr</span> <span class="kw4">auto</span> ymwdl1 <span class="br0">{</span>Tuesday<span class="br0">[</span>last<span class="br0">]</span><span class="sy2">/</span><span class="nu0">11</span><span class="sy2">/</span><span class="nu0">2021</span><span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">auto</span> ymwdl2 <span class="sy1">=</span> Tuesday<span class="br0">[</span>last<span class="br0">]</span><span class="sy2">/</span><span class="nu0">11</span><span class="sy2">/</span><span class="nu0">2020</span><span class="sy4">;</span>
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ymwdl2 <span class="sy2">+</span><span class="sy1">=</span> months<span class="br0">(</span><span class="nu0">12</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a> <span class="sy1"><<</span> <span class="br0">(</span>ymwdl1 <span class="sy1">==</span> ymwdl2<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<pre class="de1">true</pre></div>
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