This guy's biggest problem is that he doesn't know the standard library very well.

I admit it's ugly, but the code below removes whitespace using only standard C++ calls. There's also an isspace() function from the <locale> header that takes a specific locale, but I'm not sure it's important for whitespace.

    std::wstring removeSpaces(std::wstring theStr) {
        return std::wstring(theStr.begin(),
                            std::remove_if(theStr.begin(), 
                                           theStr.end(),
                                           std::iswspace));
    }

There's also codec conversion in the <locale> header [1]. It's also pretty ugly, but it's easier to understand than his home grown solution, and if nothing else, is already debugged. And to be honest, if you're using C++ you should be used to the code being verbose and ugly.

[1] http://en.cppreference.com/w/cpp/locale/codecvt