82 lines
5.6 KiB
HTML
82 lines
5.6 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::future<T>::share</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_future_share 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::future<T>::</span>share</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-future.html">future</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-thread-shared_future.html"><span class="kw2181">std::<span class="me2">shared_future</span></span></a><span class="sy1"><</span>T<span class="sy1">></span> share<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<p>转移 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的共享状态，若存在，到 <span class="t-lc"><a href="cpp-thread-shared_future.html">std::shared_future</a></span> 对象。多个 <span class="t-lc"><a href="cpp-thread-shared_future.html">std::shared_future</a></span> 对象可引用同一共享对象，这对于 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> 不可能。</p>
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<p>在 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> 上调用 <code>share</code> 后 <a href="cpp-thread-future-valid.html"><span class="t-c"><span class="mw-geshi cpp source-cpp">valid<span class="br0">(</span><span class="br0">)</span></span></span></a> <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1">==</span> <span class="kw2">false</span></span></span> 。</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>含有先前 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 所保有的共享状态（若存在）的 <span class="t-lc"><a href="cpp-thread-shared_future.html">std::shared_future</a></span> 对象，如同以 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-thread-shared_future.html"><span class="kw2181">std::<span class="me2">shared_future</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span>std<span class="sy4">:</span>move<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="br0">)</span></span></span> 构造。</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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<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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<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://cplusplus.github.io/LWG/issue2556">LWG 2556</a></td>
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<td>C++11</td>
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<td><code>share()</code> 要求 <code>valid()</code> 为 <code>true</code></td>
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<td>移除要求并使之为 <code>noexcept</code></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><a href="cpp-thread-shared_future.html"><span class="t-lines"><span>shared_future</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</td>
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<td>等待被异步设置的值（可能为其他 future 所引用）<br />
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<span class="t-mark">(类模板)</span></td>
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