63 lines
4.4 KiB
HTML
63 lines
4.4 KiB
HTML
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<title>std::experimental::promise (并发 TS)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::</span>promise <span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></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-concurrency.html">concurrency</a></span></div>
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<p><i>此页面提及并发 TS 所提供的支持该 TS 所改进的 <code>std::future</code> 的 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 版本。库基础 TS 所提供的带类型擦除分配器支持的 <code>promise</code> 修改版本，见 <a href="cpp-experimental-lib_extensions-promise.html"><tt>std::experimental::fundamentals_v2::promise</tt></a> 。</i></p>
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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> R <span class="sy1">></span> <span class="kw1">class</span> promise<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> R <span class="sy1">></span> <span class="kw1">class</span> promise<span class="sy1"><</span>R<span class="sy3">&</span><span class="sy1">></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><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><></span> <span class="kw1">class</span> promise<span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></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-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<p><code>std::experimental::concurrency_v1::promise</code> 是并发 TS 所提供的 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 修改版本，它运用 <span class="t-lc">std::experimental::future</span> 。</p>
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<p>其相对于 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 的唯一更改是 <code>get_future()</code> 返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">experimental</span><span class="sy4">::</span><span class="me2">future</span></span></span> 。</p>
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