114 lines
8.8 KiB
HTML
114 lines
8.8 KiB
HTML
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_shared_future_shared_future skin-cppreference2 action-view cpp-page-template cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::shared_future<T>::</span>shared_future</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-shared_future.html">shared future</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">shared_future</span><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&&</span> f<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span><span class="kw4">const</span> std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">shared_future</span><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&</span> f<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">future</span><span class="sy1"><</span>std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">shared_future</span><span class="sy1"><</span>T<span class="sy1">>></span> <span class="sy3">&&</span> other<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">future</span><span class="sy1"><</span>T<span class="sy1">></span><span class="sy3">&&</span> f<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(5)</td>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。构造不指代共享状态的空 <code>shared_future</code> 对象。</div>
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<div class="t-li1"><span class="t-li">2)</span> 构造 <code>shared_future</code> ，转移 <code>f</code> 所保有的共享状态，若存在。构造后 <span class="t-c"><span class="mw-geshi cpp source-cpp">f.<span class="me1">valid</span><span class="br0">(</span><span class="br0">)</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 构造 <code>shared_future</code> ，与 <code>f</code> 指代同一共享状态，若共享状态存在。</div>
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<div class="t-li1"><span class="t-li">4)</span> 从 <code>other</code> 所指代的共享状态构造 <code>shared_future</code> 对象。结果 <code>shared_future</code> 的对象在下列之一发生时变为就绪：
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">other</span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span> 均就绪。存储来自 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span> 的值或异常到与结果 <code>shared_future</code> 状态关联的共享状态中。</li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">other</span></span> 就绪，但 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get</span><span class="br0">(</span><span class="br0">)</span></span></span> 非法。存储以 <span class="t-lc"><a href="cpp-thread-future_errc.html">std::future_errc::broken_promise</a></span> 为错误条件的 <span class="t-lc"><a href="cpp-thread-future_error.html">std::future_error</a></span> 类型异常到与结果 <code>shared_future</code> 对象关联的共享状态中。</li>
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</ul>
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<div class="t-li1"><span class="t-li"></span> 此构造函数返回后， <span class="t-c"><span class="mw-geshi cpp source-cpp">valid<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">true</span></span></span> 而 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">valid</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">false</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">5)</span> 构造 <code>shared_future</code> 对象，转移 <code>f</code> 所保有的共享状态，若存在。构造后 <span class="t-c"><span class="mw-geshi cpp source-cpp">f.<span class="me1">valid</span><span class="br0">(</span><span class="br0">)</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>f</td>
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<td>-</td>
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<td>用以初始化的另一 future 对象</td>
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<td>other</td>
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<td>-</td>
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<td>要解包装的 <code>std::experimental::future</code> 对象</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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<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><a href="cpp-thread-shared_future-shared_future.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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<td>构造 future 对象<br />
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<span class="t-mark">(<code>std::shared_future<T></code> 的公开成员函数)</span></td>
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