84 lines
6.1 KiB
HTML
84 lines
6.1 KiB
HTML
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<title>std::chrono::file_clock::to_utc, std::chrono::file_clock::from_utc</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::file_clock::</span>to_utc, <span style="font-size:0.7em; line-height:130%">std::chrono::file_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-file_clock.html">file 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">utc_time</span><span class="sy1"><</span><span class="coMULTI">/*see below*/</span><span class="sy1">></span><br /></p>
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to_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">file_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>(1)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span><br />
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<span class="t-mark">(可选)</span></td>
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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">file_time</span><span class="sy1"><</span><span class="coMULTI">/*see below*/</span><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> t<span class="br0">)</span><span class="sy4">;</span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span><br />
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<span class="t-mark">(可选)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 转换 <code>file_time</code> <code>t</code> 为表示同一时间点的 <code>utc_time</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 转换 <code>utc_time</code> <code>t</code> 为表示同一时间点的 <code>file_time</code> 。</div>
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<p>从 <code>Duration</code> 以未指定方式计算返回类型的时长。</p>
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<p>这些函数模板是可选的：实现可以替而选择提供 <code>to_sys</code> 和 <code>from_sys</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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<div class="t-li1"><span class="t-li">1)</span> 与参数表示相同时间点的 <code>utc_time</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 与参数表示相同时间点的 <code>file_time</code> 。</div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>用户代码通常应使用 <span class="t-lc">std::chrono::clock_cast</span> ，它对时钟间转换提供通用接口，而非直接调用这些函数。</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><a href="cpp-chrono-file_clock-to_from_sys.html"><span class="t-lines"><span>to_sys</span><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 class="t-mark">(可选)</span></span></span></div>
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</td>
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<td>在 <code>file_time</code> 与 <code>sys_time</code> 之间转换<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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