159 lines
8.5 KiB
HTML
159 lines
8.5 KiB
HTML
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<title>std::future_errc</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_future_errc 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_errc</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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<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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<div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> <span class="kw1">class</span> future_errc <span class="br0">{</span><br /></span>
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<p> broken_promise <span class="sy1">=</span> <span class="coMULTI">/* implementation-defined */</span>,<br />
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future_already_retrieved <span class="sy1">=</span> <span class="coMULTI">/* implementation-defined */</span>,<br />
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promise_already_satisfied <span class="sy1">=</span> <span class="coMULTI">/* implementation-defined */</span>,<br />
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no_state <span class="sy1">=</span> <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><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p>有作用域枚举 <code>std::future_errc</code> 定义 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> 及相关类于 <span class="t-lc"><a href="cpp-thread-future_error.html">std::future_error</a></span> 异常对象中报告的错误码。只要求四个错误码，尽管实现可以定义额外的错误码。因为提供了 <span class="t-lc"><a href="cpp-error-error_code-is_error_code_enum.html">std::is_error_code_enum</a></span> 的恰当特化，故 <code>std::future_errc</code> 类型值可隐式转换为 <span class="t-lc"><a href="cpp-error-error_code.html">std::error_code</a></span> 。</p>
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<p>所有错误码均相异且非零。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.B8.B8.E9.87.8F">成员常量</span></h3>
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<td>常量</td>
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<td>解释</td>
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<td><code>broken_promise</code></td>
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<td>异步任务抛弃其共享状态</td>
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<td><code>future_already_retrieved</code></td>
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<td>共享状态的内容已通过 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></span> 访问</td>
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<tr class="t-dsc">
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<td><code>promise_already_satisfied</code></td>
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<td>试图两次存储值于共享状态</td>
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</tr>
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<td><code>no_state</code></td>
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<td>试图访问无关联共享状态的 <span class="t-lc"><a href="cpp-thread-promise.html">std::promise</a></span> 或 <span class="t-lc"><a href="cpp-thread-future.html">std::future</a></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-thread-future_errc-make_error_code.html"><span class="t-lines"><span>make_error_code<span class="t-dsc-small">(std::future_errc)</span></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>构造一个 future error_code<br />
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<span class="t-mark">(函数)</span></td>
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<div><a href="cpp-thread-future_errc-make_error_condition.html"><span class="t-lines"><span>make_error_condition<span class="t-dsc-small">(std::future_errc)</span></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>构造一个 future error_condition<br />
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<span class="t-mark">(函数)</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-thread-future_errc-is_error_code_enum.html"><span class="t-lines"><span>is_error_code_enum<span class="t-dsc-small"><std::future_errc></span></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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</td>
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<td>扩展类型特性 <span class="t-lc"><a href="cpp-error-error_code-is_error_code_enum.html">std::is_error_code_enum</a></span> 以鉴别 future 错误码<br />
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<span class="t-mark">(类模板)</span></td>
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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=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<tr>
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2056">LWG 2056</a></td>
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<td>C++11</td>
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<td><code>broken_promise</code> 曾被指定为约定上用于表示“无错误”的零</td>
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<td>指定为非零</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-error-error_code.html"><span class="t-lines"><span>error_code</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>保有依赖于平台的错误码<br />
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<span class="t-mark">(类)</span></td>
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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-error-error_condition.html"><span class="t-lines"><span>error_condition</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>保有可移植的错误码<br />
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<span class="t-mark">(类)</span></td>
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</table>
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</div>
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