116 lines
7.8 KiB
HTML
116 lines
7.8 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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<title>std::sub_match<BidirIt>::compare</title>
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<link rel="stylesheet" href="ext.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_sub_match_compare 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::sub_match<BidirIt>::</span>compare</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-sub_match.html">sub match</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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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">int</span> compare<span class="br0">(</span> <span class="kw4">const</span> sub_match<span class="sy3">&</span> m <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>(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"><span class="kw4">int</span> compare<span class="br0">(</span> <span class="kw4">const</span> string_type<span class="sy3">&</span> s <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>(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>
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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"><span class="kw4">int</span> compare<span class="br0">(</span> <span class="kw4">const</span> value_type<span class="sy2">*</span> c <span class="br0">)</span> <span class="kw4">const</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>
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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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</tr>
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</tbody>
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</table>
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<div class="t-li1"><span class="t-li">1)</span> 通过直接比较其底层字符序列比较二个 <span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match</span></span> 。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">str<span class="br0">(</span><span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>m.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 比较 <span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match</span></span> 与 <span class="t-lc"><a href="cpp-string-basic_string.html">std::basic_string</a></span> 。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">str<span class="br0">(</span><span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>s<span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 比较 <span class="t-c"><span class="mw-geshi cpp source-cpp">sub_match</span></span> 与 <code>s</code> 所指向的底层字符类型的空终止序列。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">str<span class="br0">(</span><span class="br0">)</span>.<span class="me1">compare</span><span class="br0">(</span>c<span class="br0">)</span></span></span> 。</div>
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<p>应用代码很少直接使用此函数。它们替而使用非成员比较运算符之一。</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>m</td>
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<td>-</td>
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<td>到另一 sub_match 的引用</td>
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</tr>
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<tr class="t-par">
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<td>s</td>
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<td>-</td>
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<td>到要比较的字符串的引用</td>
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</tr>
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<tr class="t-par">
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<td>c</td>
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<td>-</td>
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<td>指向要比较的底层 <span class="t-c"><span class="mw-geshi cpp source-cpp">value_type</span></span> 的空终止序列的指针</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>若此 sub_match <i>小于</i>另一字符序列则小于零的值，若二个底层字符序列相等则为零，若此 sub_match <i>大于</i>另一字符序列则为大于零的值。</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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<tr>
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<td class="mbox-empty-cell"></td>
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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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</tr>
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</table>
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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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string-compare.html"><span class="t-lines"><span>compare</span></span></a></div>
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</div>
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</td>
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<td>比较二个字符串<br />
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<span class="t-mark">(<code>std::basic_string<CharT,Traits,Allocator></code> 的公开成员函数)</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-str.html"><span class="t-lines"><span>str</span><span>operator string_type</span></span></a></div>
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</div>
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</td>
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<td>转换为底层字符串类型<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-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator<</span><span>operator<=</span><span>operator></span><span>operator>=</span><span>operator<=></span></span></a></div>
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<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>比较一个 <code>sub_match</code> 与另一 <code>sub_match</code> 、字符串或字符<br />
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<span class="t-mark">(函数模板)</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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</div>
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</body>
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</html>
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