60 lines
4.6 KiB
HTML
60 lines
4.6 KiB
HTML
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<title>std::regex_traits<CharT>::translate_nocase</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::regex_traits<CharT>::</span>translate_nocase</h1>
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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-regex_traits.html">regex traits</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">CharT translate_nocase<span class="br0">(</span>CharT c<span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>获得字符 <code>c</code> 的比较关键，使得感染的 locale 中，所有忽略大小写差异（若存在）后等价于此字符的所有字符产生相同关键。</p>
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<p>正则表达式库需要匹配二个字符 <code>c1</code> 和 <code>c2</code> ，且标志 <span class="t-lc"><a href="cpp-regex-syntax_option_type.html">std::regex_constants::icase</a></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 时，它执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">regex_traits<span class="sy1"><></span><span class="sy4">::</span><span class="me2">translate_nocase</span><span class="br0">(</span>c1<span class="br0">)</span> <span class="sy1">==</span> regex_traits<span class="sy1"><></span><span class="sy4">::</span><span class="me2">translate_nocase</span><span class="br0">(</span>c2<span class="br0">)</span></span></span> 。</p>
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<p><span class="t-lc"><a href="cpp-regex-regex_traits.html">std::regex_traits</a></span> 的标准库特化返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-locale-use_facet.html"><span class="kw1897">std::<span class="me2">use_facet</span></span></a><span class="sy1"><</span><a href="cpp-locale-ctype.html"><span class="kw1938">std::<span class="me2">ctype</span></span></a><span class="sy1"><</span>CharT<span class="sy1">>></span><span class="br0">(</span>getloc<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span>.<span class="me1">tolower</span><span class="br0">(</span>c<span class="br0">)</span></span></span> ，即用当前感染的 locale 转换 <code>c</code> 为小写。</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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<td>c</td>
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<td>-</td>
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<td>需要检验等价性的字符，忽略大小写</td>
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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>当前感染的本地环境中 <code>c</code> 的无关大小写的比较关键。</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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<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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