56 lines
4.3 KiB
HTML
56 lines
4.3 KiB
HTML
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<title>std::chrono::year_month_day::ok</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::year_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-year_month_day.html">year 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>检查此 <code>year_month_day</code> 对象是否表示合法的日历日期。</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_day</code> 对象表示合法的日历日期，即存储的 <code>year</code> 、 <code>month</code> 和 <code>day</code> 值均合法，且存储的 <code>day</code> 值在给定年和月的日数内，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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<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">可能的实现</span></h3>
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<pre class="de1"><span class="kw4">constexpr</span> <span class="kw4">bool</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">year_month_day</span><span class="sy4">::</span><span class="me2">ok</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span> <span class="br0">{</span>
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<span class="kw1">return</span> 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> day<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>
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day<span class="br0">(</span><span class="br0">)</span> <span class="sy1"><=</span> <span class="br0">(</span>year<span class="br0">(</span><span class="br0">)</span><span class="sy2">/</span>month<span class="br0">(</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">last</span><span class="br0">)</span>.<span class="me1">day</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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