58 lines
4.3 KiB
HTML
58 lines
4.3 KiB
HTML
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<title>std::chrono::utc_clock::to_sys</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::utc_clock::</span>to_sys</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-utc_clock.html">utc clock</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span><span class="kw1">class</span> Duration<span class="sy1">></span><br /></span>
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<p><span class="kw4">static</span> std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">sys_time</span><span class="sy1"><</span><a href="cpp-types-common_type.html"><span class="kw636">std::<span class="me2">common_type_t</span></span></a><span class="sy1"><</span>Duration, <a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="sy1">>></span><br /></p>
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to_sys<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">utc_time</span><span class="sy1"><</span>Duration<span class="sy1">></span><span class="sy3">&</span> t<span class="br0">)</span><span class="sy4">;</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>转换 <code>utc_time</code> <code>t</code> 为表示同一时间点的 <code>sys_time</code> （若可能）。</p>
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<p>若 <code>t</code> 表示在闰秒插入期间的时间点，则返回先于插入闰秒的最后可表示 <code>sys_time</code> 值。所有其他情况下， <span class="t-c"><span class="mw-geshi cpp source-cpp">utc_clock<span class="sy4">::</span><span class="me2">from_sys</span><span class="br0">(</span>utc_clock<span class="sy4">::</span><span class="me2">to_sys</span><span class="br0">(</span>t<span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> t</span></span> 。</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>与 <code>t</code> 表示同一时间点的 <code>sys_time</code> ，或若 <code>t</code> 表示在闰秒插入期间的时间点，则为先于插入闰秒的最后可表示值。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-chrono-utc_clock-from_sys.html"><span class="t-lines"><span>from_sys</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div>
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<td>转换 <code>sys_time</code> 为 <code>utc_time</code><br />
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<span class="t-mark">(公开静态成员函数)</span></td>
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