100 lines
6.4 KiB
HTML
100 lines
6.4 KiB
HTML
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<title>std::make_error_code(std::io_errc)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_io_errc_make_error_code 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>make_error_code<span class="t-dsc-small">(std::io_errc)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-io.html">io</a>‎ | <a href="cpp-io-io_errc.html">io errc</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-ios.html"><ios></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a> make_error_code<span class="br0">(</span> <a href="cpp-io-io_errc.html"><span class="kw1810">std::<span class="me2">io_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>从 <span class="t-lc"><a href="cpp-io-io_errc.html">std::io_errc</a></span> 类型的值构造一个 <span class="t-lc"><a href="cpp-error-error_code.html">std::error_code</a></span> 对象，如同通过 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="br0">(</span><span class="kw1">static_cast</span><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span><span class="br0">(</span>e<span class="br0">)</span>, <a href="cpp-io-iostream_category.html"><span class="kw1812">std::<span class="me2">iostream_category</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 。给定 <span class="t-lc"><a href="cpp-io-io_errc.html">std::io_errc</a></span> 参数时，此函数为 <span class="t-lc"><a href="cpp-error-error_code.html">std::error_code</a></span> 的构造函数所调用。</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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<table class="t-par-begin">
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<td>e</td>
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<td>-</td>
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<td>错误码编号</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><span class="t-lc"><a href="cpp-error-error_code.html">std::error_code</a></span> 类型的值，保有来自 <code>e</code> 的错误码编号，关联到错误类别 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">"iostream"</span></span></span> 。</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 <iostream></span>
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<span class="co2">#include <system_error></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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<a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a> ec <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">make_error_code</span><span class="br0">(</span><a href="cpp-io-io_errc.html"><span class="kw1811">std::<span class="me2">io_errc</span><span class="sy4">::</span><span class="me2">stream</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> <span class="st0">"Error code from io_errc::stream has category "</span>
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<span class="sy1"><<</span> ec.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">name</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>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">Error code from io_errc::stream has category iostream</pre></div>
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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>
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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-io-io_errc.html"><span class="t-lines"><span>io_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>IO 流的错误码<br />
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<span class="t-mark">(枚举)</span></td>
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</div>
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