59 lines
4.9 KiB
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59 lines
4.9 KiB
HTML
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<title>std::chrono::year_month_weekday::operator sys_days, std::chrono::year_month_weekday::operator local_days</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::year_month_weekday::</span>operator sys_days, <span style="font-size:0.7em; line-height:130%">std::chrono::year_month_weekday::</span>operator local_days</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.html">year month weekday</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> operator std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">sys_days</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</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> operator std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">local_days</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</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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<p>转换 <code>*this</code> 为与此 <code>year_month_weekday</code> 表示同一日期的 <span class="t-lc"><a href="cpp-chrono-time_point.html">std::chrono::time_point</a></span> 。</p>
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<div class="t-li1"><span class="t-li">1)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">year<span class="br0">(</span><span class="br0">)</span>.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&&</span> month<span class="br0">(</span><span class="br0">)</span>.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&&</span> weekday<span class="br0">(</span><span class="br0">)</span>.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span></span></span> ：
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<li>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">index<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则返回表示该年月的首个 <span class="t-lc">weekday()</span> 前 7 日的日期的 <code>sys_days</code> 。</li>
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<li>其他情况下，返回表示该年月的首个 <span class="t-lc">weekday()</span> 后 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span>index<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> <span class="nu0">1</span><span class="br0">)</span> <span class="sy2">*</span> <span class="nu0">7</span></span></span> 日的日期的 <code>sys_days</code> 。</li>
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<div class="t-li1"><span class="t-li"></span> 否则，返回值未指定。</div>
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<div class="t-li1"><span class="t-li">2)</span> 同 <span class="t-v">(1)</span> ，但返回 <code>local_days</code> ，而非 <code>sys_days</code> 。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">local_days<span class="br0">(</span>sys_days<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span>.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
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