NAME¶

std::char_traits::length,std::char_traits::length, - std::char_traits::length,std::char_traits::length,

Synopsis¶

std::char_traits<char32_t>::length

static std::size_t length( const char_type* s ); (constexpr since C++17)

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

See CharTraits for the general requirements on character traits for X::length.

Parameters¶

s - pointer to a character sequence to return length of

Return value¶

The length of character sequence pointed to by s.

Complexity¶

Linear.

Example¶

// Run this code

#include <iomanip>
#include <iostream>
#include <string>

void print(const char* str)
{
std::cout << std::quoted(str) << " has length = "
<< std::char_traits<char>::length(str) << '\n';
}

int main()
{
print("foo");

std::string s{"booo"};
print(s.c_str());
}

Output:¶

"foo" has length = 3
"booo" has length = 4