std::strcspn
STD：：strcspn
| Defined in header | | |
|---|---|---|
| size_t strcspn( const char *dest, const char *src | | |
返回字节字符串的最大初始段的长度。dest，它仅由字符组成。不指向的字节字符串中找到src...
函数名代表“互补跨度”。
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未找到的仅包含未找到字符的最大初始段的长度。src...
例
二次
#include <string>
#include <cstring>
#include <iostream>
const char* invalid = "*$#";
int main()
{
std::string s = "abcde312$#@";
size_t valid_len = std::strcspn(s.c_str(), invalid
if(valid_len != s.size())
std::cout << "'" << s << "' contains invalid chars starting at position "
<< valid_len << '\n';
}
二次
产出：
二次
'abcde312$#@' contains invalid chars starting at position 8
二次
另见
| strspn | returns the length of the maximum initial segment that consists of only the characters found in another byte string (function) |
|---|---|
| wcscspn | returns the length of the maximum initial segment that consists of only the wide not found in another wide string (function) |
| strpbrk | finds the first location of any character from a set of separators (function) |
| find_first_of | find first occurrence of characters (public member function of std::basic_string) |
c strcspn的文档
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