206 lines
11 KiB
HTML
206 lines
11 KiB
HTML
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<title>std::experimental::promise (库基础 TS)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_lib_extensions_promise 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>promise <span class="t-mark-rev t-since-libfund-ts t-mark-ts">(库基础 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-lib_extensions.html">lib extensions</a></span></div>
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<p><i>此页面提及库基础 TS 所提供的带类型擦除分配器支持的 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 修改版本。并发 TS 所提供的支持该 TS 所改进的 <code>std::future</code> 的 <code>promise</code> 版本，见 <a href="cpp-experimental-concurrency-promise.html"><tt>std::experimental::concurrency_v1::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-libfund-ts t-mark-ts">(库基础 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-libfund-ts t-mark-ts">(库基础 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-libfund-ts t-mark-ts">(库基础 TS)</span></td>
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<p><code>std::experimental::fundamentals_v1::promise</code> （和 <code>std::experimental::fundamentals_v2::promise</code> ）是 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 的修改版，由库基础 TS 提供，带类型擦除分配器的支持。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>成员类型</td>
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<td>定义</td>
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<td><code>allocator_type</code></td>
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<td><span class="t-lc"><a href="cpp-experimental-erased_type.html">std::experimental::erased_type</a></span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><a href="cpp-experimental-lib_extensions-promise-promise.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>构造 <code>promise</code> 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-lib_extensions-promise-get_memory_resource.html"><span class="t-lines"><span>get_memory_resource</span></span></a></div>
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</td>
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<td>取得指向此对象用来分配内存的 memory_resource 的指针<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">非成员函数</span></h3>
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<div><a href="cpp-experimental-lib_extensions-promise-swap2.html"><span class="t-lines"><span>std::experimental::swap<span class="t-dsc-small">(std::experimental::promise)</span></span></span></a></div>
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</td>
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<td>特化 <code>swap</code> 算法<br />
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<span class="t-mark">(函数模板)</span></td>
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<h3><span class="mw-headline" id=".E8.BE.85.E5.8A.A9.E7.B1.BB">辅助类</span></h3>
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<div><a href="cpp-experimental-lib_extensions-promise-uses_allocator.html"><span class="t-lines"><span>std::uses_allocator<span class="t-dsc-small"><std::experimental::promise></span></span></span></a></div>
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</td>
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<td>特化 <span class="t-lc"><a href="cpp-memory-uses_allocator.html">std::uses_allocator</a></span> 类型特性<br />
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<span class="t-mark">(类模板特化)</span></td>
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<div style="overflow: hidden; margin: 1em 0 0 0; border: 1px solid #aaa; background-color: #e3f9df; padding: 0.2em 1em 1em 1em;" id="identical-">
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<h2><span class="mw-headline" id=".E7.AD.89.E5.90.8C.E4.BA.8E_std::promise_.E7.9A.84.E6.88.90.E5.91.98">等同于 <span style="font-size:0.7em; line-height:130%">std::</span>promise 的成员</span></h2>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0_2">成员函数</span></h3>
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<div><a href="cpp-thread-promise-~promise.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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<td>析构<code>std::promise</code>对象<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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</td>
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<td>赋值共享状态<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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</td>
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<td>交换二个 promise 对象<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.8E.B7.E5.8F.96.E7.BB.93.E6.9E.9C">获取结果</span></h5>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-get_future.html"><span class="t-lines"><span>get_future</span></span></a></div>
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</td>
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<td>返回与承诺的结果关联的 <a href="cpp-thread-future.html"><tt>future</tt></a><br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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</tr>
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<td colspan="2">
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<h5><span class="mw-headline" id=".E8.AE.BE.E7.BD.AE.E7.BB.93.E6.9E.9C">设置结果</span></h5>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-set_value.html"><span class="t-lines"><span>set_value</span></span></a></div>
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</td>
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<td>设置结果为指定值<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-set_value_at_thread_exit.html"><span class="t-lines"><span>set_value_at_thread_exit</span></span></a></div>
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</div>
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</td>
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<td>设置结果为指定值，同时仅在线程退出时分发提醒<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-set_exception.html"><span class="t-lines"><span>set_exception</span></span></a></div>
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</div>
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</td>
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<td>设置结果为指示异常<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-promise-set_exception_at_thread_exit.html"><span class="t-lines"><span>set_exception_at_thread_exit</span></span></a></div>
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</td>
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<td>设置结果为指示异常，同时仅在线程退出时分发提醒<br />
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<span class="t-mark">(<code>std::promise<R></code> 的公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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</div>
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<div class="visualClear"></div>
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