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

std::regex_traits<CharT>::length: std::regex_traits<CharT>::length

NAME

std::regex_traits<CharT>::length - std::regex_traits<CharT>::length

Synopsis

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

Calculates the length of a null-terminated character sequence, that is, the smallest i such that p[i]==0.
Standard library specializations of std::regex_traits execute std::char_traits<CharT>::length(p);

Parameters

p - pointer to the first element of the null-terminated character sequence

Return value

The length of the null-terminated character string.

Example

// Run this code

  #include <regex>
  #include <iostream>

  int main()
  {
      std::cout << std::regex_traits<char>::length(u8"Кошка") << '\n'
                << std::regex_traits<wchar_t>::length(L"Кошка") << '\n';
  }

Output:

  10
  5