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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::</span>last_spec, <span style="font-size:0.7em; line-height:130%">std::chrono::</span>last</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></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">struct</span> last_spec<br /></span>
<p><span class="br0">{</span><br />
&nbsp; &nbsp; <span class="kw1">explicit</span> last_spec<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span><br /></p>
<span class="br0">}</span><span class="sy4">;</span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">inline</span> <span class="kw4">constexpr</span> last_spec last<span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<p><code>last_spec</code> &#26159;&#29992;&#20110;&#19982;&#20854;&#20182;&#26085;&#21382;&#31867;&#22411;&#21512;&#21462;&#65292;&#20197;&#25351;&#31034;&#24207;&#21015;&#20013;&#26368;&#21518;&#19968;&#39033;&#30340;&#31354;&#26631;&#31614;&#31867;&#22411;&#12290;&#20381;&#36182;&#20110;&#35821;&#22659;&#65292;&#23427;&#21487;&#20197;&#25351;&#31034;&#26376;&#30340;&#26368;&#21518;&#19968;&#26085;&#65288;&#22914;&#22312;&#23545;&#20110; 2018 &#24180;&#20108;&#26376;&#30340;&#26368;&#21518;&#19968;&#26085;&#65292;&#21363; 2018-02-28 &#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp">2018y<span class="sy2">/</span>February<span class="sy2">/</span>last</span></span> &#20013;&#65289;&#25110;&#26376;&#20013;&#30340;&#26143;&#26399;&#30340;&#26368;&#21518;&#19968;&#26085;&#65288;&#22914;&#22312;&#23545;&#20110; 2018 &#24180;&#20108;&#26376;&#26368;&#21518;&#19968;&#20010;&#26143;&#26399;&#26085;&#65292;&#21363; 2018-02-25 &#30340; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">2018</span><span class="sy2">/</span>February<span class="sy2">/</span>Sunday<span class="br0">[</span>last<span class="br0">]</span></span></span> &#20013;&#65289;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;chrono&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><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> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a><span class="sy4">;</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> mdl <span class="br0">{</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">June</span><span class="sy2">/</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">last</span><span class="br0">}</span><span class="sy4">;</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="br0">(</span>mdl <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">month_day_last</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">month</span><span class="br0">(</span><span class="nu0">6</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39; &#39;</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> <span class="kw4">auto</span> ymwdl <span class="br0">{</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">year</span><span class="br0">(</span><span class="nu0">2023</span><span class="br0">)</span><span class="sy2">/</span>
std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">December</span><span class="sy2">/</span>
std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">Tuesday</span><span class="br0">[</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">last</span><span class="br0">]</span>
<span class="br0">}</span><span class="sy4">;</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="br0">(</span>ymwdl <span class="sy1">==</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="br0">(</span>
std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">year</span><span class="br0">(</span><span class="nu0">2023</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">month</span><span class="br0">(</span><span class="nu0">12</span><span class="br0">)</span>,
std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">weekday_last</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">Tuesday</span><span class="br0">)</span><span class="br0">)</span>
<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">true true</pre></div>
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