72 lines
4.4 KiB
HTML
72 lines
4.4 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>标准库头文件 <latch></title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_header_latch skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">标准库头文件</span> <latch></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-header.html">header</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<p>此头文件是<a href="cpp-thread.html">线程支持</a>库的一部分。</p>
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<table class="t-dsc-begin">
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E7.B1.BB">类</span></h3>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-latch.html"><span class="t-lines"><span>latch</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>单次使用的线程屏障<br />
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<span class="t-mark">(类)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">概要</span></h3>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">class</span> latch<span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB_std::latch">类 <span class="t-lc">std::latch</span></span></h4>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">class</span> latch <span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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<span class="kw4">static</span> <span class="kw4">constexpr</span> ptrdiff_t max<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">constexpr</span> <span class="kw1">explicit</span> latch<span class="br0">(</span>ptrdiff_t expected<span class="br0">)</span><span class="sy4">;</span>
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~latch<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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latch<span class="br0">(</span><span class="kw4">const</span> latch<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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latch<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> latch<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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<span class="kw4">void</span> count_down<span class="br0">(</span>ptrdiff_t update <span class="sy1">=</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw4">bool</span> try_wait<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">void</span> wait<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span>
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<span class="kw4">void</span> arrive_and_wait<span class="br0">(</span>ptrdiff_t update <span class="sy1">=</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">private</span><span class="sy4">:</span>
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ptrdiff_t counter<span class="sy4">;</span> <span class="co1">// 仅用于阐释</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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