95 lines
7.9 KiB
HTML
95 lines
7.9 KiB
HTML
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<title>std::regex_traits<CharT>::lookup_collatename</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::regex_traits<CharT>::</span>lookup_collatename</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"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> ForwardIt <span class="sy1">></span><br />
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string_type lookup_collatename<span class="br0">(</span> ForwardIt first, ForwardIt last <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<p>若字符序列 <code>[first, last)</code> 表示当前感染的 locale 中合法对照元素的名称，则返回该对照元素之名。否则，返回空字符串。</p>
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<p>对照元素是在 POSIX 正则表达式的 <code>[.</code> 与 <code>.]</code> 之间找到的符号。例如， <code>[.a.]</code> 在 C 本地环境中匹配字符 <code>a</code> 。而 <code>[.tilde.]</code> 在 C 本地环境中匹配 <code>~</code> 。 <code>[.ch.]</code> 在捷克语本地环境中匹配双标符 <code>ch</code> ，但在大多数其他本地环境中生成错误码为 <span class="t-lc"><a href="cpp-regex-error_type.html">std::regex_constants::error_collate</a></span> 的 <span class="t-lc"><a href="cpp-regex-regex_error.html">std::regex_error</a></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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<td>first, last</td>
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<td>-</td>
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<td>一对迭代器，确定表示对照元素名的字符序列</td>
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<td colspan="3">类型要求</td>
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<td colspan="3">-
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<code>ForwardIt</code> 必须满足<a href="cpp-named_req-ForwardIterator.html"><span style="font-style:italic">老式向前迭代器</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyForwardIterator)</span></a> 的要求。</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>具名对照元素作为字符串的表示。</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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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iostream></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <regex></span>
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<span class="kw1">struct</span> noisy_traits <span class="sy4">:</span> <a href="cpp-regex-regex_traits.html"><span class="kw2026">std::<span class="me2">regex_traits</span></span></a><span class="sy1"><</span><span class="kw4">char</span><span class="sy1">></span> <span class="br0">{</span>
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<span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Iter <span class="sy1">></span>
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string_type lookup_collatename<span class="br0">(</span> Iter first, Iter last <span class="br0">)</span> <span class="kw4">const</span> <span class="br0">{</span>
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string_type result <span class="sy1">=</span> regex_traits<span class="sy4">::</span><span class="me2">lookup_collatename</span><span class="br0">(</span>first, last<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"regex_traits<>::lookup_collatename(<span class="es1">\"</span>"</span>
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<span class="sy1"><<</span> string_type<span class="br0">(</span>first, last<span class="br0">)</span>
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<span class="sy1"><<</span> <span class="st0">"<span class="es1">\"</span>) returns <span class="es1">\"</span>"</span> <span class="sy1"><<</span> result <span class="sy1"><<</span> <span class="st0">"<span class="es1">\"</span><span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="kw1">return</span> result<span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> str <span class="sy1">=</span> <span class="st0">"z|}a"</span><span class="sy4">;</span> <span class="co1">// C 本地环境对照顺序： x,y,z,{,|,},~</span>
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<a href="cpp-regex-basic_regex.html"><span class="kw1999">std::<span class="me2">basic_regex</span></span></a><span class="sy1"><</span><span class="kw4">char</span>, noisy_traits<span class="sy1">></span> re<span class="br0">(</span><span class="st0">"[x-[.tilde.]]*a"</span>, std<span class="sy4">::</span><span class="me2">regex</span><span class="sy4">::</span><span class="me2">basic</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a> <span class="sy1"><<</span> <a href="cpp-regex-regex_match.html"><span class="kw2012">std::<span class="me2">regex_match</span></span></a><span class="br0">(</span>str, re<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">regex_traits<>::lookup_collatename("tilde") returns "~"
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true</pre></div>
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