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<title>std::is_error_code_enum<std::future_errc></title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>is_error_code_enum<span class="t-dsc-small"><std::future_errc></span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-thread.html">thread</a>‎ | <a href="cpp-thread-future_errc.html">future errc</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="kw1">template</span><span class="sy1"><></span><br />
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<span class="kw1">struct</span> is_error_code_enum<span class="sy1"><</span><a href="cpp-thread-future_errc.html"><span class="kw2194">std::<span class="me2">future_errc</span></span></a><span class="sy1">></span> <span class="sy4">:</span> <a href="cpp-types-integral_constant.html"><span class="kw649">std::<span class="me2">true_type</span></span></a><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>指定 <span class="t-lc"><a href="cpp-thread-future_errc.html">std::future_errc</a></span> 是错误码枚举。这允许 <span class="t-lc"><a href="cpp-error-error_code.html">std::error_code</a></span> 自动转换。</p>
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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><a href="cpp-error-error_code-is_error_code_enum.html"><span class="t-lines"><span>is_error_code_enum</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>鉴别类是否可作为 error_code 枚举<br />
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<span class="t-mark">(类模板)</span></td>
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