65 lines
4.9 KiB
HTML
65 lines
4.9 KiB
HTML
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<title>std::chrono::weekday::weekday</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::weekday::</span>weekday</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-weekday.html">weekday</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">weekday<span class="br0">(</span><span class="br0">)</span> <span class="sy1">=</span> <span class="kw1">default</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> <span class="kw4">constexpr</span> weekday<span class="br0">(</span><span class="kw4">unsigned</span> wd<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> weekday<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">sys_days</span><span class="sy3">&</span> dp<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> <span class="kw4">constexpr</span> weekday<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">local_days</span><span class="sy3">&</span> dp<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>构造 <code>weekday</code> 对象。</p>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数保留星期之日值未初始化。</div>
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<div class="t-li1"><span class="t-li">2)</span> 构造保有星期之日值 <code>wd</code> 的 <code>weekday</code> 对象。若 <span class="t-c"><span class="mw-geshi cpp source-cpp">wd <span class="sy1">==</span> <span class="nu0">7</span></span></span> ，则保有的值为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> 。若 <span class="t-c"><span class="mw-geshi cpp source-cpp">wd <span class="sy1">></span> <span class="nu0">255</span></span></span> ，则保有的值未指定。</div>
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<div class="t-li1"><span class="t-li">3)</span> 构造表示 <code>dp</code> 所对应星期之日的 <code>weekday</code> 。此构造函数定义从 <span class="t-lc">std::chrono::sys_days</span> 到 <code>weekday</code> 的隐式转换。</div>
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<div class="t-li1"><span class="t-li">4)</span> 构造表示 <code>dp</code> 所对应星期之日的 <code>weekday</code> ，如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">weekday<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">sys_days</span><span class="br0">(</span>dp.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
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