find_first_of.html
来自「从www.CppReference.com打包的C++参考手册」· HTML 代码 · 共 75 行
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>find_first_of</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">C++ Strings</a> > <a href= "find_first_of.html">find_first_of</a> </div> <div class="name-format"> find_first_of </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <string> <strong>size_type</strong> find_first_of( const string &str, <strong>size_type</strong> index = 0 ); <strong>size_type</strong> find_first_of( const char* str, <strong>size_type</strong> index = 0 ); <strong>size_type</strong> find_first_of( const char* str, <strong>size_type</strong> index, <strong>size_type</strong> num ); <strong>size_type</strong> find_first_of( char ch, <strong>size_type</strong> index = 0 );</pre> <p>The find_first_of() function either:</p> <ul> <li>returns the index of the first character within the current string that matches any character in <em>str</em>, beginning the search at <em>index</em>, string::npos if nothing is found,</li> <li>searches the current string, beginning at <em>index</em>, for any of the first <em>num</em> characters in <em>str</em>, returning the index in the current string of the first character found, or string::npos if no characters match,</li> <li>or returns the index of the first occurrence of <em>ch</em> in the current string, starting the search at <em>index</em>, string::npos if nothing is found.</li> </ul> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="find.html">find</a><br> <a href="find_first_not_of.html">find_first_not_of</a><br> <a href="find_last_not_of.html">find_last_not_of</a><br> <a href="find_last_of.html">find_last_of</a><br> <a href="rfind.html">rfind</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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