60 lines
3.5 KiB
HTML
60 lines
3.5 KiB
HTML
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<title>std::counting_semaphore<LeastMaxValue>::counting_semaphore</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::counting_semaphore<LeastMaxValue>::</span>counting_semaphore</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-thread.html">thread</a>‎ | <a href="cpp-thread-counting_semaphore.html">counting semaphore</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw1">explicit</span> counting_semaphore<span class="br0">(</span> <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a> desired <span class="br0">)</span><span class="sy4">;</span></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></td>
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<div><span class="mw-geshi cpp source-cpp">counting_semaphore<span class="br0">(</span> <span class="kw4">const</span> counting_semaphore<span class="sy3">&</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></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></td>
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<div class="t-li1"><span class="t-li">1)</span> 构造一个 <code>std::counting_semaphore</code> 类型对象，初始化其计数器的值为 <code>desired</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 复制构造函数被删除。</div>
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<h3><span class="mw-headline" id=".E5.89.8D.E6.9D.A1.E4.BB.B6">前条件</span></h3>
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<div class="t-li1"><span class="t-li">1)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">desired <span class="sy1">>=</span> <span class="nu0">0</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">desired <span class="sy1"><=</span> max<span class="br0">(</span><span class="br0">)</span></span></span> 均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>desired</td>
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<td>-</td>
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<td>用于初始化 <code>counting_semaphore</code> 的计数器的值</td>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛出。</p>
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