78 lines
4.3 KiB
HTML
78 lines
4.3 KiB
HTML
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<title>std::make_error_condition(std::errc)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>make_error_condition<span class="t-dsc-small">(std::errc)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-error.html">error</a>‎ | <a href="cpp-error-errc.html">errc</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-system_error.html"><system_error></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-error-error_condition.html"><span class="kw874">std::<span class="me2">error_condition</span></span></a> make_error_condition<span class="br0">(</span> <a href="cpp-error-errc.html"><span class="kw880">std::<span class="me2">errc</span></span></a> e <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>为 <code>errc</code> 值 <code>e</code> 创建一个 error_condition 。设置错误码为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span><span class="br0">(</span>e<span class="br0">)</span></span></span> ，错误类别为 <span class="t-lc"><a href="cpp-error-generic_category.html">std::generic_category</a></span> 。</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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<td>e</td>
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<td>-</td>
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<td>标准错误码</td>
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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><code>e</code> 的错误条件。</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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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <system_error></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">auto</span> err <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_error_condition</span><span class="br0">(</span><a href="cpp-error-errc.html"><span class="kw909">std::<span class="me2">errc</span><span class="sy4">::</span><span class="me2">invalid_argument</span></span></a><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> err.<span class="me1">message</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>可能的输出：</p>
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<div class="text source-text">
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<pre class="de1">Invalid argument</pre></div>
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