85 lines
6.1 KiB
HTML
85 lines
6.1 KiB
HTML
<!DOCTYPE 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::scoped_lock<MutexTypes...>::scoped_lock</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_scoped_lock_scoped_lock skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::scoped_lock<MutexTypes...>::</span>scoped_lock</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-scoped_lock.html">scoped lock</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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> scoped_lock<span class="br0">(</span> MutexTypes<span class="sy3">&</span>... <span class="me1">m</span> <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-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">scoped_lock<span class="br0">(</span> <a href="cpp-thread-lock_tag_t.html"><span class="kw2162">std::<span class="me2">adopt_lock_t</span></span></a>, MutexTypes<span class="sy3">&</span>... <span class="me1">m</span> <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-cxx17">(C++17 起)</span></td>
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<tr class="t-dcl t-since-cxx17">
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<div><span class="mw-geshi cpp source-cpp">scoped_lock<span class="br0">(</span> <span class="kw4">const</span> scoped_lock<span class="sy3">&</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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</tr>
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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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</tr>
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</tbody>
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</table>
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<p>取得给定互斥 <code>m</code> 的所有权。</p>
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<div class="t-li1"><span class="t-li">1)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>MutexTypes<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 则不做任何事。否则若 <span class="t-c"><span class="mw-geshi cpp source-cpp">sizeof...<span class="br0">(</span>MutexTypes<span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">1</span></span></span> ，则等效地调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">lock</span><span class="br0">(</span><span class="br0">)</span></span></span> 。否则，等效地调用 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-thread-lock.html"><span class="kw2169">std::<span class="me2">lock</span></span></a><span class="br0">(</span>m...<span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 取得互斥 <span class="t-c"><span class="mw-geshi cpp source-cpp">m...</span></span> 的所有权而不试图锁定任何互斥。除非当前线程在 <code>m...</code> 中的每个对象上保有一个非共享锁（即以 <code>lock</code>、 <code>try_lock</code>、 <code>try_lock_for</code> 或 <code>try_lock_until</code> 取得的锁），否则行为未定义。</div>
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<div class="t-li1"><span class="t-li">3)</span> 复制构造函数被删除。</div>
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<p>若 <code>m</code> 在 <code>scoped_lock</code> 对象之前被销毁，则行为未定义。</p>
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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>m</td>
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<td>-</td>
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<td>要获得其所有权的互斥</td>
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</tr>
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</table>
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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> 抛出任何 <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">lock</span><span class="br0">(</span><span class="br0">)</span></span></span> 所抛的异常</div>
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<div class="t-li1"><span class="t-li">2)</span> 不抛出</div>
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<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<tr>
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://wg21.link/p0739r0">P0739R0</a></td>
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<td>C++17</td>
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<td><code>adopt_lock_t</code> 参数在最后，妨碍类模板实参推导</td>
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<td>移到最前</td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</body>
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