56 lines
5.0 KiB
HTML
56 lines
5.0 KiB
HTML
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<title>std::stop_token::stop_possible</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_stop_token_stop_possible 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::stop_token::</span>stop_possible</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-stop_token.html">stop token</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">bool</span> stop_possible<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>检查 <code>stop_token</code> 对象是否拥有关联状态，而该状态已被请求停止或拥有关联的 <span class="t-lc">std::stop_source</span> 对象。</p>
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<p>默认构造的 <span class="t-c"><span class="mw-geshi cpp source-cpp">stop_token</span></span> 无关联停止状态，从而不能请求停止；若未作出停止请求，则不存在 <span class="t-lc">std::stop_source</span> 对象的关联停止状态亦不能请求停止。</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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<p>（无）</p>
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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>若 <code>stop_token</code> 对象无关联停止状态，或仍未收到停止请求且无关联的 <span class="t-lc">std::stop_source</span> 对象则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> ；否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。</p>
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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>若 <code>stop_token</code> 拥有关联停止状态且已作出停止请求，则此函数仍返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。</p>
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<p>若 <code>stop_token</code> 对象拥有来自 <span class="t-lc">std::jthread</span> 的关联停止状态——例如 <code>stop_token</code> 是通过在 <span class="t-lc">std::jthread</span> 对象上调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">get_stop_token<span class="br0">(</span><span class="br0">)</span></span></span> 取得的——则此函数始终返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。 <span class="t-lc">std::jthread</span> 始终拥有内部的 <span class="t-lc">std::stop_source</span> 对象，即使该线程的调用函数不检查它。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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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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