72 lines
5.6 KiB
HTML
72 lines
5.6 KiB
HTML
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<title>std::experimental::make_exceptional_future</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_make_exceptional_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::experimental::</span>make_exceptional_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></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/future&action=edit&redlink=1" class="new" title="cpp/header/experimental/future（页面不存在）"><experimental/future></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> T <span class="sy1">></span><br />
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future<span class="sy1"><</span>T<span class="sy1">></span> make_exceptional_future<span class="br0">(</span><a href="cpp-error-exception_ptr.html"><span class="kw776">std::<span class="me2">exception_ptr</span></span></a> ex<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw1">class</span> T, <span class="kw1">class</span> E <span class="sy1">></span><br />
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future<span class="sy1"><</span>T<span class="sy1">></span> make_exceptional_future<span class="br0">(</span>E ex<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 创建立即就绪的 <code>T</code> 类型共享装填，并存储异常指针 <code>ex</code> ，然后返回与该共享状态该关联的 <code>future</code> ，如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">promise<span class="sy1"><</span>T<span class="sy1">></span> p<span class="sy4">;</span> p.<span class="me1">set_exception</span><span class="br0">(</span>ex<span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> p.<span class="me1">get_future</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。若 <code>ex</code> 为空则行为未定义。</div>
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<div class="t-li1"><span class="t-li">2)</span> 创建立即就绪的 <code>T</code> 类型共享状态，并存储从 <code>ex</code> 构造的异常指针，然后返回与该共享状态关联的 <code>future</code> ，如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">promise<span class="sy1"><</span>T<span class="sy1">></span> p<span class="sy4">;</span> p.<span class="me1">set_exception</span><span class="br0">(</span><a href="cpp-error-make_exception_ptr.html"><span class="kw777">std::<span class="me2">make_exception_ptr</span></span></a><span class="br0">(</span>ex<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> p.<span class="me1">get_future</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</div>
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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>与创建的共享状态关联的 <code>future</code> 对象。</p>
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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-experimental-make_ready_future.html"><span class="t-lines"><span>make_ready_future</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></span></span></div>
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<td>产生立即就绪并保有指定值的 future<br />
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<span class="t-mark">(函数模板)</span></td>
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