virtual protected member function
       charT do_toupper (charT c) const;
const charT* do_toupper (charT* low, const charT* high) const;

Convert to uppercase [virtual]

Virtual protected member function in charge of converting characters to uppercase, as described in public member function toupper (see ctype::toupper for details).

Polymorphic derived classes can redefine the behavior of this function.

See also