std::char_traits<CharT>::length (3) - Linux Manuals

std::char_traits<CharT>::length: std::char_traits<CharT>::length

NAME

std::char_traits<CharT>::length - std::char_traits<CharT>::length

Synopsis

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