std::char_traits<CharT>::length

static std::size_t length( const char_type* s );

static constexpr std::size_t length( const char_type* s );

Returns the length of the character sequence pointed to by s, that is, the position of the terminating null character (CharT()).

Parameters

Return value

The length of character sequence pointed to by s.

Exceptions

(none).

Complexity

Linear.

Example

#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());
}

string 'foo' length = 3
string 'booo' length = 4