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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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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::future_category</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_future_category 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::</span>future_category</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>定义于头文件 <code><a href="cpp-header-future.html"><future></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> <a href="cpp-error-error_category.html"><span class="kw871">std::<span class="me2">error_category</span></span></a><span class="sy3">&</span> future_category<span class="br0">(</span><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-cxx11">(C++11 起)</span></td>
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<p>获得对于 future 和 promise 相关错误的静态 error_category 对象的引用。要求对象覆写虚函数 <span class="t-c"><span class="mw-geshi cpp source-cpp">error_category<span class="sy4">::</span><span class="me2">name</span><span class="br0">(</span><span class="br0">)</span></span></span> ,以返回指向字符串 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"future"</span></span></span> 的指针。它亦用于鉴别 <span class="t-lc"><a href="cpp-thread-future_error.html">std::future_error</a></span> 类型异常中提供的 error_code 。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>(无)</p>
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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>到静态对象的引用,其运行时类型导出自 <span class="t-lc"><a href="cpp-error-error_category.html">std::error_category</a></span> 且未指定。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因:暂无示例</td>
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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-future_errc.html"><span class="t-lines"><span>future_errc</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>鉴别 future 错误码<br />
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<span class="t-mark">(枚举)</span></td>
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<div><a href="cpp-thread-future_error.html"><span class="t-lines"><span>future_error</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>报告与 future 或 promise 有关的错误<br />
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<span class="t-mark">(类)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-error-error_category.html"><span class="t-lines"><span>error_category</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>错误类别的基类<br />
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<span class="t-mark">(类)</span></td>
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<div class="visualClear"></div>
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