152 lines
8.4 KiB
HTML
152 lines
8.4 KiB
HTML
<!DOCTYPE html>
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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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<title>std::io_errc</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_io_errc skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>io_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-io.html">io</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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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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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> <span class="kw1">class</span> io_errc<span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<p>带作用域枚举 <code>std::io_errc</code> 定义 I/O 流报告于 <span class="t-lc"><a href="cpp-io-ios_base-failure.html">std::ios_base::failure</a></span> 异常对象的错误码。只要求一个错误码（ <code>std::io_errc::stream</code> ），虽然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> 的适当特化，故 <code>std::io_errc</code> 类型的值能隐式转换成 <span class="t-lc"><a href="cpp-error-error_code.html">std::error_code</a></span> 。</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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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>枚举常量</td>
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<td>值</td>
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</tr>
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<tr class="t-dsc">
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<td><code>stream</code></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span></span></span></td>
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</tr>
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</table>
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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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<table class="t-dsc-begin">
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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-make_error_code.html"><span class="t-lines"><span>make_error_code<span class="t-dsc-small">(std::io_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 iostream 错误码<br />
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<span class="t-mark">(函数)</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-make_error_condition.html"><span class="t-lines"><span>make_error_condition<span class="t-dsc-small">(std::io_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 iostream error_condition<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.B8.AE.E5.8A.A9.E7.B1.BB">帮助类</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-io_errc-is_error_code_enum.html"><span class="t-lines"><span>is_error_code_enum<span class="t-dsc-small"><std::io_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>扩充类型特征 <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 iostream 错误码<br />
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<span class="t-mark">(类模板特化)</span></td>
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</tr>
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</table>
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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="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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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 <fstream></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-io-basic_ifstream.html"><span class="kw1732">std::<span class="me2">ifstream</span></span></a> f<span class="br0">(</span><span class="st0">"doesn't exist"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">try</span> <span class="br0">{</span>
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f.<span class="me1">exceptions</span><span class="br0">(</span>f.<span class="me1">failbit</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span> <span class="kw1">catch</span> <span class="br0">(</span><span class="kw4">const</span> <a href="cpp-io-ios_base-failure.html"><span class="kw1670">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">failure</span></span></a><span class="sy3">&</span> e<span class="br0">)</span> <span class="br0">{</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">"Caught an ios_base::failure.<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="kw1">if</span><span class="br0">(</span>e.<span class="me1">code</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> std<span class="sy4">::</span><span class="me2">io_errc</span><span class="sy4">::</span><span class="me2">stream</span><span class="br0">)</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">"The error code is std::io_errc::stream<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span></pre></div>
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</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">Caught an ios_base::failure.
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The error code is std::io_errc::stream</pre></div>
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</div>
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</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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<table class="t-dsc-begin">
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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_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-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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</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-ios_base-failure.html"><span class="t-lines"><span>failure</span></span></a></div>
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</div>
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</td>
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<td>流异常<br />
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<span class="t-mark">(<code>std::ios_base</code> 的公开成员类)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</body>
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