120 lines
6.3 KiB
HTML
120 lines
6.3 KiB
HTML
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<title>std::chrono::steady_clock</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_chrono_steady_clock 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::</span>steady_clock</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-chrono.html">chrono</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-chrono.html"><chrono></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> steady_clock<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>类 <code>std::chrono::steady_clock</code> 表示单调时钟。此时钟的时间点无法减少，因为物理时间向前移动。此时钟与壁钟时间无关（例如，它能是上次重启开始的时间），且最适于度量间隔。</p>
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<p><code>std::chrono::steady_clock</code> 满足<a href="cpp-named_req-TrivialClock.html"><span style="font-style:italic">平凡时钟</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(TrivialClock)</span></a> 的要求。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>成员类型</td>
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<td>定义</td>
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<td><code>rep</code></td>
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<td>表示时钟时长中计次数的算术类型</td>
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<td><code>period</code></td>
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<td>表示时钟计次周期的 <span class="t-lc"><a href="cpp-numeric-ratio-ratio.html">std::ratio</a></span> 类型，单位为秒</td>
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<td><code>duration</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-chrono-duration.html"><span class="kw993">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">duration</span></span></a><span class="sy1"><</span>rep, period<span class="sy1">></span></span></span></td>
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<td><code>time_point</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">steady_clock</span><span class="sy1">></span></span></span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.B8.B8.E9.87.8F">成员常量</span></h3>
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<div><span class="t-lines"><span><span class="t-dsc-small">constexpr bool</span> is_steady</span></span></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>稳定时钟标志，始终为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span><br />
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<span class="t-mark">(公开静态成员常量)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><a href="cpp-chrono-steady_clock-now.html"><span class="t-lines"><span>now</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>返回表示当前时钟值的 time_point<br />
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<span class="t-mark">(公开静态成员函数)</span></td>
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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-system_clock.html"><span class="t-lines"><span>system_clock</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</td>
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<td>来自系统范围实时时钟的壁钟时间<br />
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<span class="t-mark">(类)</span></td>
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<div><a href="cpp-chrono-high_resolution_clock.html"><span class="t-lines"><span>high_resolution_clock</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</td>
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<td>拥有最短可用计次周期的时钟<br />
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<span class="t-mark">(类)</span></td>
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