91 lines
5.3 KiB
HTML
91 lines
5.3 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::packaged_task<R(Args...)>::operator()</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_packaged_task_operator skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::packaged_task<R(Args...)>::</span>operator()</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-thread.html">thread</a>‎ | <a href="cpp-thread-packaged_task.html">packaged task</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> ArgTypes... <span class="me1">args</span> <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<td></td>
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<p>以 <code>args</code> 为参数调用存储的任务。任务返回值或任何抛出的异常被存储于共享状态。令共享状态就绪，并解除阻塞任何等待此操作的线程。</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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<td>args</td>
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<td>-</td>
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<td>调用时传递给存储任务的参数</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>（无）</p>
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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>遇到下列条件时为 <span class="t-lc"><a href="cpp-thread-future_error.html">std::future_error</a></span> ：</p>
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<ul>
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<li>已调用存储的任务。设置 error_category 为 <a href="cpp-thread-future_errc.html"><tt>promise_already_satisfied</tt></a> 。</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 无共享状态。设置 error_category 为 <a href="cpp-thread-future_errc.html"><tt>no_state</tt></a> 。</li>
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</ul>
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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>对 <code>operator()</code> 的成功调用同步于对任何与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 共享其共享状态的 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> 或 <span class="t-lc"><a href="cpp-thread-shared_future.html">std::shared_future</a></span> 的任何成员函数调用。</p>
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</td>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 前)</span></td>
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<p>在共享状态已提供的同步保证外，无另外的同步保证。</p>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-packaged_task-make_ready_at_thread_exit.html"><span class="t-lines"><span>make_ready_at_thread_exit</span></span></a></div>
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</div>
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</td>
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<td>执行函数，并确保结果仅在一旦当前线程退出时就绪<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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