Question

Here is what I would like to do.

Say I have Class Widget.

I then create Button from Widget.

I then create ModifiedWidget which re-implements certain functions of Widget.

I then want Button to use ModifiedWidget rather than plain Widget. Is this possible to do some how?

Thanks

class Button : public Widget;

class SuperButton : public Button, public ModifiedWidget;

I’m just not sure if that would do what I want it to though.

Answer 1

The easiest way is to use encapsulation, not inheritance.

class Button
{
    Button(Widget * w) { mywidget = w; }
    Widget * mywidget;
};

Another way is to let Button be a template class.

template<class Parent>
class Button : Parent
{
};

Button<Widget> mybutton1;
Button<ModifiedWidget> mybutton2;