std::char_traits::length

1	`static` `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

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

#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

Links:

http://en.cppreference.com/w/cpp/string/char_traits/length

doc_CPP

2025-01-10 15:47:30

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