67 lines
4.5 KiB
HTML
67 lines
4.5 KiB
HTML
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::gps_clock::</span>from_utc</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-gps_clock.html">gps 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">gps_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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from_utc<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><span class="br0">)</span> <span class="kw1">noexcept</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> 为表示相同时间点的 <code>gps_time</code> 。</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> 表示相同时间点的 <span class="t-lc">std::chrono::gps_time</span> ，如同以从 <span class="t-c"><span class="mw-geshi cpp source-cpp">t.<span class="me1">time_since_epoch</span><span class="br0">(</span><span class="br0">)</span></span></span> 构造返回类型的值，并减去 <span class="t-c"><span class="mw-geshi cpp source-cpp">315964809s</span></span> 一般计算。 （ 315964809 是时钟 <code>gps_clock</code> 的纪元 1980-01-06 00:00:00 UTC 和时钟 <code>utc_clock</code> 的纪元 1970-01-01 00:00:00 UTC 间的秒数。）</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 class="t-dsc-member-div">
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<div><a href="cpp-chrono-gps_clock-to_utc.html"><span class="t-lines"><span>to_utc</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>gps_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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<div><a href="cpp-chrono-clock_cast.html"><span class="t-lines"><span>clock_cast</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>转换一个时钟的时间点为另一个<br />
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<span class="t-mark">(函数模板)</span></td>
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