42 lines
3.1 KiB
HTML
42 lines
3.1 KiB
HTML
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<title>std::chrono::year_month_weekday::ok</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>ok</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> <span class="kw4">bool</span> ok<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><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>检查此 <code>year_month_weekday</code> 对象是否表示合法日期。</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>若此 <code>year_month_weekday</code> 对象表示合法日期，即 <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_indexed<span class="br0">(</span><span class="br0">)</span>.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 且指定年月中至少有 <span class="t-lc">index()</span> 个 <span class="t-lc">weekday()</span> ，则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</p>
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