140 lines
9.9 KiB
HTML
140 lines
9.9 KiB
HTML
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_error_system_error_system_error 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::system_error::</span>system_error</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-error.html">error</a>‎ | <a href="cpp-error-system_error.html">system error</a></span></div>
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<table class="t-dcl-begin">
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<tr class="t-dcl t-since-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a> ec <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a> ec, <span class="kw4">const</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy3">&</span> what_arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a> ec, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> what_arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <span class="kw4">int</span> ev, <span class="kw4">const</span> <a href="cpp-error-error_category.html"><span class="kw871">std::<span class="me2">error_category</span></span></a><span class="sy3">&</span> ecat <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <span class="kw4">int</span> ev, <span class="kw4">const</span> <a href="cpp-error-error_category.html"><span class="kw871">std::<span class="me2">error_category</span></span></a><span class="sy3">&</span> ecat,<br />
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<span class="kw4">const</span> <a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a><span class="sy3">&</span> what_arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <span class="kw4">int</span> ev, <span class="kw4">const</span> <a href="cpp-error-error_category.html"><span class="kw871">std::<span class="me2">error_category</span></span></a><span class="sy3">&</span> ecat,<br />
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<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> what_arg <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(4)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<tr class="t-dcl t-since-cxx11">
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<div><span class="mw-geshi cpp source-cpp">system_error<span class="br0">(</span> <span class="kw4">const</span> system_error<span class="sy3">&</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(5)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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<p>构造新的 system_error 对象。</p>
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<div class="t-li1"><span class="t-li">1)</span> 以 error_code <code>ec</code> 构造</div>
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<div class="t-li1"><span class="t-li">2)</span> 以 error_code <code>ec</code> 和解释字符串 <code>what_arg</code> 构造。 <span class="t-lc"><a href="cpp-error-system_error-what.html">what()</a></span> 返回的字符串保证含有 <code>what_arg</code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 以底层错误码 <code>ev</code> 和关联的 error_category <code>ecat</code> 构造。</div>
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<div class="t-li1"><span class="t-li">4)</span> 以底层错误码 <code>ev</code> 、关联的 error_category <code>ecat</code> 和解释字符串 <code>what_arg</code> 构造。 <span class="t-lc"><a href="cpp-error-system_error-what.html">what()</a></span> 返回的字符串保证含有 <code>what_arg</code> （假定它不含内嵌的空字符 ）。</div>
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<div class="t-li1"><span class="t-li">5)</span> 复制构造函数。以 <code>other</code> 的内容初始化内容。若 <code>*this</code> 与 <code>other</code> 均拥有动态类型 <code>std::system_error</code> 则 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-byte-strcmp.html"><span class="kw1146">std::<span class="me2">strcmp</span></span></a><span class="br0">(</span>what<span class="br0">(</span><span class="br0">)</span>, other.<span class="me1">what</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span> 。</div>
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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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<tr class="t-par">
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<td>ec</td>
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<td>-</td>
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<td>错误码</td>
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<tr class="t-par">
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<td>ev</td>
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<td>-</td>
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<td>基础编码的错误码</td>
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</tr>
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<tr class="t-par">
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<td>ecat</td>
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<td>-</td>
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<td>错误类别</td>
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</tr>
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<tr class="t-par">
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<td>what_arg</td>
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<td>-</td>
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<td>解释性字符串</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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<p>演示如何从 errno 值创建 system_error 异常</p>
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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 <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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<span class="kw1">try</span>
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<span class="br0">{</span>
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<span class="kw1">throw</span> <a href="cpp-error-system_error.html"><span class="kw959">std::<span class="me2">system_error</span></span></a><span class="br0">(</span><a href="cpp-error-errno_macros.html"><span class="kw810">EDOM</span></a>, <a href="cpp-error-generic_category.html"><span class="kw872">std::<span class="me2">generic_category</span></span></a><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="kw1">catch</span> <span class="br0">(</span><span class="kw4">const</span> <a href="cpp-error-system_error.html"><span class="kw959">std::<span class="me2">system_error</span></span></a><span class="sy3">&</span> error<span class="br0">)</span>
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<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">"Error: "</span> <span class="sy1"><<</span> error.<span class="me1">code</span><span class="br0">(</span><span class="br0">)</span>
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<span class="sy1"><<</span> <span class="st0">" - "</span> <span class="sy1"><<</span> error.<span class="me1">code</span><span class="br0">(</span><span class="br0">)</span>.<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>
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<span class="br0">}</span></pre></div>
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</div>
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<p>可能的输出：</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: generic:33 - Numerical argument out of domain</pre></div>
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<div class="visualClear"></div>
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