std::basic_string::rfind
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< cpp | string | basic string
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| size_type rfind( const basic_string& str, size_type pos = npos ) const; |
(1) | |
| size_type rfind( const CharT* s, size_type pos, size_type count ) const; |
(2) | |
| size_type rfind( const CharT* s, size_type pos = npos ) const; |
(3) | |
| size_type rfind( CharT ch, size_type pos = npos ) const; |
(4) | |
Finds the last substring equal to the given character sequence. Search begins at pos, i.e. only the substring [0, pos) is considered in the search. If npos is passed as pos whole string will be searched.
1) Finds the last substring equal to str.
2) Finds the last substring equal to the first count characters of the character string pointed to by s. s can include null characters.
3) Finds the last substring equal to the character string pointed to by s. The length of the string is determined by the first null character.
4) Finds the last character ch.
目录 |
[编辑] 参数
| str | - | 要搜索的字符串
|
| count | - | 要搜索的子字符串的长度
|
| s | - | 指针一个字符串SEACH
原文： pointer to a character string to seach for |
| ch | - | 搜索字符
|
[编辑] 返回值
找到的字符串或
npos的第一个字符的位置，如果没有这样的子被找到原文：
position of the first character of the found substring or
npos if no such substring is found.[编辑] 示例
#include <string> #include <iostream> void print(std::string::size_type n, std::string const &s) { if(n == std::string::npos) std::cout << "not found\n"; else std::cout << "found: " << s.substr(n) << '\n'; } int main() { std::string::size_type n; std::string const s = "This is a string"; // search backwards from beginning of string n = s.rfind("is"); print(n, s); // search backwards from position 4 n = s.rfind("is", 4); print(n, s); // find a single character n = s.rfind('s'); print(n, s); // find a single character n = s.rfind('q'); print(n, s); }
输出：
found: is a string found: is is a string found: string not found
[编辑] 另请参阅
| 找到字符串中的字符 （公共成员函数） | |
| 第一次出现的字符 （公共成员函数） | |
| 找到第一个没有的字符 （公共成员函数） | |
| 最后一次出现的字符 （公共成员函数） | |
| 找到最后没有的字符 （公共成员函数） | |
