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<title>std::chrono::duration&lt;Rep,Period&gt;::count</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::chrono::duration&lt;Rep,Period&gt;::</span>count</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-chrono.html">chrono</a>&lrm; | <a href="cpp-chrono-duration.html">duration</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> rep count<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>&#36820;&#22238;&#27492; duration &#30340;&#35745;&#27425;&#25968;&#12290;</p>
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<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#27492; duration &#30340;&#35745;&#27425;&#25968;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;chrono&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-chrono-duration.html"><span class="kw996">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">milliseconds</span></span></a> ms<span class="br0">{</span><span class="nu0">3</span><span class="br0">}</span><span class="sy4">;</span> <span class="co1">// 3 &#27627;&#31186;</span>
<span class="co1">// &#20174; 3 &#27627;&#31186;&#26500;&#36896; 6000 &#24494;&#31186;</span>
<a href="cpp-chrono-duration.html"><span class="kw995">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">microseconds</span></span></a> us <span class="sy1">=</span> <span class="nu0">2</span><span class="sy2">*</span>ms<span class="sy4">;</span>
<span class="co1">// &#20351;&#29992;&#20998;&#25968;&#35745;&#27425;&#30340; 30Hz &#26102;&#38047;</span>
<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">&lt;</span><span class="kw4">double</span>, <a href="cpp-numeric-ratio-ratio.html"><span class="kw1522">std::<span class="me2">ratio</span></span></a><span class="sy1">&lt;</span><span class="nu0">1</span>, <span class="nu0">30</span><span class="sy1">&gt;&gt;</span> hz30<span class="br0">(</span><span class="nu16">3.5</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;3 ms duration has &quot;</span> <span class="sy1">&lt;&lt;</span> ms.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; ticks<span class="es1">\n</span>&quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;6000 us duration has &quot;</span> <span class="sy1">&lt;&lt;</span> us.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; ticks<span class="es1">\n</span>&quot;</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&quot;3.5 30Hz duration has &quot;</span> <span class="sy1">&lt;&lt;</span> hz30.<span class="me1">count</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; ticks<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">3 ms duration has 3 ticks
6000 us duration has 6000 ticks
3.5 30Hz duration has 3.5 ticks</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="cpp-chrono-duration-duration_cast.html"><span class="t-lines"><span>duration_cast</span></span></a></div>
<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>&#36716;&#25442;&#26102;&#38271;&#21040;&#21478;&#19968;&#20010;&#25317;&#26377;&#19981;&#21516;&#22016;&#21970;&#38388;&#38548;&#30340;&#26102;&#38271;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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