std::strspn
STD：：strspn
| Defined in header | | |
|---|---|---|
| size_t strspn( const char* dest, const char* src | | |
返回指向的字节字符串的最大初始段%28 span%29的长度。dest的字节字符串中找到的字符。src...
参数
| dest | - | pointer to the null-terminated byte string to be analyzed |
|---|---|---|
| src | - | pointer to the null-terminated byte string that contains the characters to search for |
返回值
所指向的字节字符串中仅包含字符的最大初始段的长度。src...
例
二次
#include <cstring>
#include <string>
#include <iostream>
const char *low_alpha = "qwertyuiopasdfghjklzxcvbnm";
int main()
{
std::string s = "abcde312$#@";
std::size_t spnsz = std::strspn(s.c_str(), low_alpha
std::cout << "After skipping initial lowercase letters from '" << s
<< "'\nThe remainder is '" << s.substr(spnsz) << "'\n";
}
二次
产出：
二次
After skipping initial lowercase letters from 'abcde312$#@'
The remainder is '312$#@'
二次
另见
| strcspn | returns the length of the maximum initial segment that consists of only the characters not found in another byte string (function) |
|---|---|
| wcsspn | returns the length of the maximum initial segment that consists of only the wide characters found in another wide string (function) |
| strpbrk | finds the first location of any character from a set of separators (function) |
c strspn的文档
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