66 lines
4.5 KiB
HTML
66 lines
4.5 KiB
HTML
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<title>std::barrier<CompletionFunction>::barrier</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::barrier<CompletionFunction>::</span>barrier</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-barrier.html">barrier</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> barrier<span class="br0">(</span> <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a> expected,<br />
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CompletionFunction f <span class="sy1">=</span> CompletionFunction<span class="br0">(</span><span class="br0">)</span><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">barrier<span class="br0">(</span> <span class="kw4">const</span> barrier <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> 设置每个阶段的初始期待计数及首阶段的当前期待计数为 <code>expected</code> ，以 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>f<span class="br0">)</span></span></span> 初始化完成函数对象，然后开始第一阶段。若 <code>expected</code> 为负或大于 <a href="cpp-thread-barrier-max.html"><code>max()</code></a> 则行为未定义。</div>
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<div class="t-li1"><span class="t-li">2)</span> 复制构造函数被删除。 <code>barrier</code> 既不可复制亦不可移动。</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>expected</td>
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<td>-</td>
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<td>期待计数的初值</td>
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<tr class="t-par">
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<td>f</td>
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<td>-</td>
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<td>要在在阶段完成步骤调用的完成函数对象</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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<div class="t-li1"><span class="t-li">1)</span> 任何 <code>CompletionFunction</code> 的移动构造函数所抛的异常。</div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>容许 <code>expected</code> 为零。然而在这种 <code>barrier</code> 上调用析构函数以外的任何非静态成员函数导致未定义行为。换言之，这种 <code>barrier</code> 只能被销毁。</p>
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