Question about C++ (please, answer)



Hi, everyone.
 
I have a simple (or complex) c++ question.
The below source code do not be compiled and make errors.
I really don't know why. Maybe I'm too foolish -_-;
I'll wating for your answering. Thanks so much.
 
/****** begin of source ******/
 
class Widget
{
protected:
    void draw() {}
    int _i;
};
 
class Button : public Widget
{
protected:
    void draw()
    {
        ((Widget*)this)->_i++;
        ((Widget*)this)->draw();
    }
};
 
void main() {}
 
/******* end of source ********/
 
I think that it's a compiler (internal) problem. 
I compiled it with VC++ and GCC but All failed.
I think that the problem comes from accessing of type-casted 'this' 
pointer
But I don't know exactly.
 
Happy new year.
 

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