89 lines
5.4 KiB
HTML
89 lines
5.4 KiB
HTML
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<title>std::shared_future<T>::shared_future</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_shared_future_shared_future 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::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-thread.html">thread</a>‎ | <a href="cpp-thread-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>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td rowspan="142">(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> shared_future<span class="sy3">&</span> other <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span> <span class="kw4">const</span> shared_future<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><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">shared_future<span class="br0">(</span> <a href="cpp-thread-future.html"><span class="kw2180">std::<span class="me2">future</span></span></a><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>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">shared_future<span class="br0">(</span> shared_future<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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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>构造新的 <code>shared_future</code> 。</p>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。构造空的 shared_future ，它不指代共享状态，即 <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">false</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 构造与 <code>other</code> 指代同一共享状态的 shared_future ，若有共享状态。</div>
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<div class="t-li1"><span class="t-li">3-4)</span> 转移 <code>other</code> 所保有的共享状态给 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 。构造后， <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> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp">this<span class="sy2">-</span><span class="sy1">></span>valid<span class="br0">(</span><span class="br0">)</span></span></span> 返回与 <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></span> 在构造前会返回者相同的值。</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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<table class="t-par-begin">
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<td>other</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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