#include <iostream>
#include <locale>
#include <vector>

std::ostream & operator << ( std::ostream &os, const wchar_t * txt )
{
  int new_size = WideCharToMultiByte( CP_UTF8, 0, txt, -1, NULL, NULL, NULL, NULL );
  if ( new_size <= 0 )
    return os;
  std::vector<char> buffer(new_size);
  WideCharToMultiByte( CP_UTF8, 0, txt, -1, &buffer[0], new_size, NULL, NULL );
  os << &buffer[0];
  return os;
}

/**/int main()
    {
    std::locale loc("fr_FR");
    std::cout << "User locale: " << loc.name() << std::endl;
    std::wstring str(L"àäâéèêëïîöôüû");
    std::cout << str.c_str() << std::endl;

    for(std::wstring::iterator it=str.begin();it!=str.end();++it)
       {
       *it = toupper(*it, loc);
       }
    std::cout << str.c_str();
    std::cout << std::endl;

    return 0;
    }