#include <iostream>
#include <locale>

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

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

    std::wcout << std::endl;

    return 0;
    }