Std::char_traits::length (3) Linux Manual Page

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

std::char_traits::length (3) Linux Manual Page