118 lines
6.7 KiB
HTML
118 lines
6.7 KiB
HTML
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<title>std::strspn</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_byte_strspn 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::</span>strspn</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-string.html">string</a>‎ | <a href="cpp-string-byte.html">byte</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-cstring.html"><cstring></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp">size_t strspn<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> dest, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> src <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>返回 <code>dest</code> 所指向的空终止字节串的最大起始段（ span ）长度，段仅由 <code>src</code> 所指向的空终止字节字符串中找到的字符组成。</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>dest</td>
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<td>-</td>
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<td>指向要分析的空终止字节字符串的指针</td>
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</tr>
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<tr class="t-par">
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<td>src</td>
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<td>-</td>
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<td>指向含有要搜索的字符的空终止字节字符串的指针</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>仅由来自 <code>src</code> 所指向的空终止字节字符串的字符组成的最大起始段长度。</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="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <cstring></span>
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<span class="co2">#include <string></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>low_alpha <span class="sy1">=</span> <span class="st0">"qwertyuiopasdfghjklzxcvbnm"</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="kw1229">std::<span class="me2">string</span></span></a> s <span class="sy1">=</span> <span class="st0">"abcde312$#@"</span><span class="sy4">;</span>
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<a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> spnsz <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">strspn</span><span class="br0">(</span>s.<span class="me1">c_str</span><span class="br0">(</span><span class="br0">)</span>, low_alpha<span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"After skipping initial lowercase letters from '"</span> <span class="sy1"><<</span> s
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<span class="sy1"><<</span> <span class="st0">"'<span class="es1">\n</span>The remainder is '"</span> <span class="sy1"><<</span> s.<span class="me1">substr</span><span class="br0">(</span>spnsz<span class="br0">)</span> <span class="sy1"><<</span> <span class="st0">"'<span class="es1">\n</span>"</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">After skipping initial lowercase letters from 'abcde312$#@'
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The remainder is '312$#@'</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-strcspn.html"><span class="t-lines"><span>strcspn</span></span></a></div>
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<td>返回仅由另一字节字符串中找不到的字符组成的最大起始段的长度<br />
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<span class="t-mark">(函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-wide-wcsspn.html"><span class="t-lines"><span>wcsspn</span></span></a></div>
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</div>
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</td>
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<td>返回仅由另一宽字符串中找到的宽字符组成的最大起始段的长度<br />
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<span class="t-mark">(函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-string-byte-strpbrk.html"><span class="t-lines"><span>strpbrk</span></span></a></div>
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</div>
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</td>
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<td>寻找任何来自分隔符集合的字符的首个位置<br />
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<span class="t-mark">(函数)</span></td>
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</table>
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</div>
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