80 lines
5.7 KiB
HTML
80 lines
5.7 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::experimental::flex_barrier::flex_barrier</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_flex_barrier_flex_barrier skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::flex_barrier::</span>flex_barrier</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-flex_barrier.html">flex barrier</a></span></div>
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<table class="t-dcl-begin">
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<tr class="t-dcl t-since-concurrency">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> flex_barrier<span class="br0">(</span> <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a> num_threads <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<tr class="t-dcl t-since-concurrency">
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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> F <span class="sy1">></span><br />
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flex_barrier<span class="br0">(</span> <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a> num_threads, F completion <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<tr class="t-dcl t-since-concurrency">
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<div><span class="mw-geshi cpp source-cpp">flex_barrier<span class="br0">(</span> <span class="kw4">const</span> flex_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>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<div class="t-li1"><span class="t-li">1)</span> 拥有同 <span class="t-c"><span class="mw-geshi cpp source-cpp">flex_barrier<span class="br0">(</span>num_threads, c<span class="br0">)</span></span></span> 的效果，其中 <code>c</code> 是<a href="cpp-named_req-Callable.html"><span style="font-style:italic">可调用</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Callable)</span></a> 对象，其调用返回 -1 且无副效应。</div>
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<div class="t-li1"><span class="t-li">2)</span> 为 <code>num_threads</code> 个参与线程构造 <code>flex_barrier</code> ，将 <code>completion</code> 用于完成阶段。参与线程集是首 <code>num_threads</code> 个到达同步点的线程。</div>
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<div class="t-li1"><span class="t-li">3)</span> 复制构造函数被删除； <code>flex_barrier</code> 不可复制。</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>num_threads</td>
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<td>-</td>
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<td><code>flex_barrier</code> 的参与线程数；必须非负</td>
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</tr>
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<tr class="t-par">
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<td>completion</td>
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<td>-</td>
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<td>控制完成阶段的函数对象；必须以无参数<a href="cpp-named_req-Callable.html"><span style="font-style:italic">可调用</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Callable)</span></a> 并拥有 <span class="t-lc"><a href="cpp-types-ptrdiff_t.html">std::ptrdiff_t</a></span> 返回类型，调用时必须返回不小于 -1 的值且不抛出异常。</td>
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<tr class="t-par-hitem">
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<td colspan="3">类型要求</td>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>F</code> 必须满足<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">可复制构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span></a> 的要求。</td>
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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>若 <code>num_threads</code> 为零，则参与线程集为空，而 <code>flex_barrier</code> 只能被销毁。</p>
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