43 lines
3.3 KiB
HTML
43 lines
3.3 KiB
HTML
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<title>std::chrono::month_day::ok</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_month_day_ok skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::month_day::</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-month_day.html">month day</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>确定此 <code>month_day</code> 是否存储合法的月日组合。</p>
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<p>若 <span class="t-lc">month()</span> 表示合法月份（ <span class="t-c"><span class="mw-geshi cpp source-cpp">month<span class="br0">(</span><span class="br0">)</span>.<span class="me1">ok</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">true</span></span></span> ）， <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span><span class="br0">{</span>day<span class="br0">(</span><span class="br0">)</span><span class="br0">}</span> <span class="sy1">>=</span> <span class="nu0">1</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">unsigned</span><span class="br0">{</span>day<span class="br0">(</span><span class="br0">)</span><span class="br0">}</span> <span class="sy1"><=</span> D</span></span> ，其中 D 为 <code>month()</code> 所表示的月中的日数，则组合合法。二月中的日数被认为是 29 。</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>若月和日的组合合法则为 <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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