Returns the length of the character sequence pointed to by s, that is, the position of the terminating null character (char_type()).
See CharTraits for the general requirements on character traits for X::length.
X::length
The length of character sequence pointed to by s.
Linear.
#include <iomanip> #include <iostream> #include <string> void print(const char* str) { std::cout << std::quoted(str) << " has length = " << std::char_traits<char>::length(str) << '\n'; } int main() { print("foo"); std::string s{"booo"}; print(s.c_str(); }
Output:
"foo" has length = 3 "booo" has length = 4
