72 lines
4.8 KiB
HTML
72 lines
4.8 KiB
HTML
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<title>std::regex_traits<CharT>::length</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_regex_regex_traits_length skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::regex_traits<CharT>::</span>length</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="kw4">static</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> length<span class="br0">(</span><span class="kw4">const</span> char_type<span class="sy2">*</span> p<span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>计算空终止字符序列的长度，即满足 <span class="t-c"><span class="mw-geshi cpp source-cpp">p<span class="br0">[</span>i<span class="br0">]</span><span class="sy1">==</span><span class="nu0">0</span></span></span> 的最小 <code>i</code> 。</p>
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<p><span class="t-lc"><a href="cpp-regex-regex_traits.html">std::regex_traits</a></span> 的标准库特化执行 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-string-char_traits.html"><span class="kw1267">std::<span class="me2">char_traits</span></span></a><span class="sy1"><</span>CharT<span class="sy1">></span><span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span>p<span class="br0">)</span><span class="sy4">;</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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<td>p</td>
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<td>-</td>
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<td>指向空终止字符序列首元素的指针</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>空终止字符串的长度。</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 <regex></span>
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<span class="co2">#include <iostream></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-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</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="sy4">::</span><span class="me2">length</span><span class="br0">(</span>u8<span class="st0">"Кошка"</span><span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span>
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<span class="sy1"><<</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">wchar_t</span><span class="sy1">></span><span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span>L<span class="st0">"Кошка"</span><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">10
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5</pre></div>
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