84 lines
4.5 KiB
HTML
84 lines
4.5 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::launch</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_launch skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>launch</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-thread.html">thread</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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<div>定义于头文件 <code><a href="cpp-header-future.html"><future></a></code></div>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> <span class="kw1">class</span> launch <span class="sy4">:</span> <span class="coMULTI">/* unspecified */</span> <span class="br0">{</span><br /></span>
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<p> async <span class="sy1">=</span> <span class="coMULTI">/* unspecified */</span>,<br />
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deferred <span class="sy1">=</span> <span class="coMULTI">/* unspecified */</span>,<br />
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<span class="coMULTI">/* implementation-defined */</span><br /></p>
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<span class="br0">}</span><span class="sy4">;</span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>指定 <span class="t-lc"><a href="cpp-thread-async.html">std::async</a></span> 所指定的任务的的运行策略。 <code>std::launch</code> 是用作<a href="cpp-named_req-BitmaskType.html"><span style="font-style:italic">位掩码类型</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(BitmaskType)</span></a> 的枚举。</p>
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<p>标准库定义下列代表单独位的常量：</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>常量</td>
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<td>解释</td>
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<tr class="t-dsc">
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<td><code>std::launch::async</code></td>
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<td>运行新线程，以异步执行任务</td>
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</tr>
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<tr class="t-dsc">
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<td><code>std::launch::deferred</code></td>
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<td>调用方线程上首次请求其结果时执行任务（惰性求值）</td>
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</tr>
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</table>
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<p>另外，允许实现：</p>
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<ul>
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<li>定义额外的位和位掩码，以指定可应用于运行策略子集的任务交互上的限制，并</li>
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<li>对 <span class="t-lc"><a href="cpp-thread-async.html">std::async</a></span> 的首个（默认）重载启用这些额外位掩码。</li>
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</ul>
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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 class="t-dsc-member-div">
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<div><a href="cpp-thread-async.html"><span class="t-lines"><span>async</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>异步运行一个函数（有可能在新线程中执行），并返回保有其结果的 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span><br />
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<span class="t-mark">(函数模板)</span></td>
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</table>
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