75 lines
4.3 KiB
HTML
75 lines
4.3 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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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::match_results<BidirIt,Alloc>::length</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_match_results_length 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::match_results<BidirIt,Alloc>::</span>length</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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<tbody>
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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">difference_type length<span class="br0">(</span> size_type n <span class="sy1">=</span> <span class="nu0">0</span> <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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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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<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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</tbody>
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</table>
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<p>返回指定子匹配的长度。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则返回整个匹配的表达式的长度。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1">></span> <span class="nu0">0</span> <span class="sy3">&&</span> n <span class="sy1"><</span> size<span class="br0">(</span><span class="br0">)</span></span></span> ，则返回第 <i>n</i> 个子匹配的长度。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">n <span class="sy1">>=</span> size<span class="br0">(</span><span class="br0">)</span></span></span> ，则返回未匹配的长度。</p>
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<p>调用等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="br0">[</span>n<span class="br0">]</span>.<span class="me1">length</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</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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<tr class="t-par">
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<td>n</td>
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<td>-</td>
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<td>指定要检验哪个匹配的整数</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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<p>指定的匹配或子匹配的长度。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-regex-match_results-operator_at.html"><span class="t-lines"><span>operator[]</span></span></a></div>
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</div>
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</td>
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<td>返回指定的子匹配<br />
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<span class="t-mark">(公开成员函数)</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-regex-sub_match-length.html"><span class="t-lines"><span>length</span></span></a></div>
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</div>
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</td>
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<td>若存在则返回匹配的长度<br />
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<span class="t-mark">(<code>std::sub_match<BidirIt></code> 的公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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