C / C++ / MFC

HBITMAP hBitmap = 
        (HBITMAP )LoadImage(AfxGetResourceHandle(), 
                            LPCTSTR(IDB_BITMAP), 
                            IMAGE_BITMAP, 0, 0, 
                            LR_CREATEDIBSECTION);

class Base {

    virtual Base& operator=(const Base& value) = 0;

};

template<class T>
class base
{
public:
    virtual T& operator=(const T& assignFrom) = 0;
protected:
    // prevent client from deleting subclasses
    // through a pointer to base this class
    ~base() {}
};

class Foo : public base<Foo>
{
public:
    virtual Foo& operator=(const Foo& assignFrom)
    {
        return *this;
    }
};