117 lines
8.6 KiB
HTML
117 lines
8.6 KiB
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>operator==,!=(std::match_results)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_match_results_operator_cmp skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">operator==,!=<span style="font-size:0.7em; line-height:130%">(std::match_results)</span></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-regex.html">regex</a>‎ | <a href="cpp-regex-match_results.html">match results</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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<td>
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<div>定义于头文件 <code><a href="cpp-header-regex.html"><regex></a></code></div>
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</td>
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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="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> BidirIt, <span class="kw1">class</span> Alloc <span class="sy1">></span><br /></span>
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<p><span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> match_results<span class="sy1"><</span>BidirIt,Alloc<span class="sy1">></span><span class="sy3">&</span> lhs,<br /></p>
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match_results<span class="sy1"><</span>BidirIt,Alloc<span class="sy1">></span><span class="sy3">&</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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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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<tr class="t-dcl t-since-cxx11 t-until-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> BidirIt, <span class="kw1">class</span> Alloc <span class="sy1">></span><br /></span>
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<p><span class="kw4">bool</span> operator<span class="sy3">!</span><span class="sy1">=</span><span class="br0">(</span> match_results<span class="sy1"><</span>BidirIt,Alloc<span class="sy1">></span><span class="sy3">&</span> lhs,<br /></p>
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match_results<span class="sy1"><</span>BidirIt,Alloc<span class="sy1">></span><span class="sy3">&</span> rhs <span class="br0">)</span><span class="sy4">;</span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>比较二个 <code>match_results</code> 对象。</p>
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<p>若满足下列条件则二个 <code>match_results</code> 相等：</p>
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<ul>
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<li>无一对象为<i>就绪</i>，<i>或</i></li>
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<li>二个 match_results 均为<i>就绪</i>且满足下列条件：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp">rhs.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span></span></span> ，<i>或</i></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>lhs.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span></span></span> 且 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy3">!</span>rhs.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span></span></span> 并满足下列条件：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">prefix</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> rhs.<span class="me1">prefix</span><span class="br0">(</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> rhs.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&&</span> <a href="cpp-algorithm-equal.html"><span class="kw1573">std::<span class="me2">equal</span></span></a><span class="br0">(</span>lhs.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, lhs.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, rhs.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span></li>
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<li><span class="t-c"><span class="mw-geshi cpp source-cpp">lhs.<span class="me1">suffix</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> rhs.<span class="me1">suffix</span><span class="br0">(</span><span class="br0">)</span></span></span></li>
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</ul>
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</dd>
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</dl>
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</dd>
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</dl>
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<div class="t-li1"><span class="t-li">1)</span> 检查 <code>lhs</code> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">rhs</span></span> 是否相等。</div>
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<div class="t-li1"><span class="t-li">2)</span> 检查 <code>lhs</code> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">rhs</span></span> 是否不相等。</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>lhs, rhs</td>
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<td>-</td>
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<td>要比较的 match_results</td>
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</tr>
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<tr class="t-par-hitem">
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<td colspan="3">类型要求</td>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>BidirIt</code> 必须满足<a href="cpp-named_req-BidirectionalIterator.html"><span style="font-style:italic">老式双向迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyBidirectionalIterator)</span></a> 的要求。</td>
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</tr>
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<tr class="t-par-req">
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<td colspan="3">-
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<div class="spacer"></div>
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<code>Alloc</code> 必须满足<a href="cpp-named_req-Allocator.html"><span style="font-style:italic">分配器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Allocator)</span></a> 的要求。</td>
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</tr>
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</table>
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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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<div class="t-li1"><span class="t-li">1)</span> 若 <code>lhs</code> 与 <code>rhs</code> 相等则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 若 <code>lhs</code> 与 <code>rhs</code> 不相等则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</div>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>可能抛出实现定义的异常。</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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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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