std::char_traits<CharT>::length
From cppreference.com
< cpp | string | char traits
static std::size_t length( const char_type* s ); |
(until C++17) | |
static constexpr std::size_t length( const char_type* s ); |
(since C++17) | |
Returns the length of the character sequence pointed to by s
, that is, the position of the terminating null character (CharT()).
Parameters
s | - | pointer to a character sequence to return length of |
Return value
The length of character sequence pointed to by s
.
Exceptions
(none)
Complexity
Linear.
Example
Run this code
#include <iostream> void print(const char* str) { std::cout << "string '" << str << "' "; std::cout << "length = " << std::char_traits<char>::length(str) << '\n'; } int main() { print("foo"); std::string s("booo"); print(s.c_str()); }
Output:
string 'foo' length = 3 string 'booo' length = 4