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<title>std::operator==,!=,&lt;,&lt;=&gt;(std::error_code)</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>operator==,!=,&lt;,&lt;=&gt;<span style="font-size:0.7em; line-height:130%">(std::error_code)</span></h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-error.html">error</a>&lrm; | <a href="cpp-error-error_code.html">error code</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-system_error.html">&lt;system_error&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> lhs,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> lhs,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> operator<span class="sy1">&lt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> lhs,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> rhs <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><br />
<span class="t-mark-rev t-until-cxx20">(C++20 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">strong_ordering</span> operator<span class="sy1">&lt;=&gt;</span><span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> lhs,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">const</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&amp;</span> rhs <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-cxx20">(C++20 &#36215;)</span></td>
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<p>&#27604;&#36739;&#20108;&#20010; error_code &#23545;&#35937;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#27604;&#36739; <code>lhs</code> &#19982; <code>rhs</code> &#30340;&#30456;&#31561;&#24615;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#27604;&#36739; <code>lhs</code> &#19982; <code>rhs</code> &#30340;&#30456;&#31561;&#24615;&#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#26816;&#26597; <code>lhs</code> &#26159;&#21542;&#23567;&#20110; <code>rhs</code> &#12290;</div>
<div class="t-li1"><span class="t-li">4)</span> &#33719;&#24471; <code>lhs</code> &#19982; <code>rhs</code> &#30340;&#19977;&#36335;&#27604;&#36739;&#32467;&#26524;&#12290;</div>
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<p><code>&lt;</code>&#12289; <code>&lt;=</code>&#12289; <code>&gt;</code>&#12289; <code>&gt;=</code> &#21450; <code>!=</code> &#36816;&#31639;&#31526;&#20998;&#21035;&#20174; <code>operator&lt;=&gt;</code> &#19982; <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">&#21512;&#25104;</a>&#12290;</p>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>lhs, rhs</td>
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<td>&#35201;&#27604;&#36739;&#30340; error_code</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#33509;&#38169;&#35823;&#31867;&#21035;&#21644;&#38169;&#35823;&#20540;&#27604;&#36739;&#30456;&#31561;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#33509;&#38169;&#35823;&#31867;&#21035;&#25110;&#38169;&#35823;&#20540;&#27604;&#36739;&#19981;&#30456;&#31561;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">3)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;</span> rhs.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#21542;&#21017;&#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> rhs.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> lhs.<span class="me1">value</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;</span> rhs.<span class="me1">value</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span></div>
<div class="t-li1"><span class="t-li">4)</span> &#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;=&gt;</span> rhs.<span class="me1">category</span><span class="br0">(</span><span class="br0">)</span></span></span> &#19981;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">strong_ordering</span><span class="sy4">::</span><span class="me2">equal</span></span></span> &#21017;&#20026;&#35813;&#20540;&#12290;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">value</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;=&gt;</span> rhs.<span class="me1">value</span><span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<td>&#33719;&#24471;&#27492; error_code &#30340; error_category<br />
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