Realization -- used for creation
class R : public M, public V {\fbox{R}
public: R( int k=0, int h=10, int w=20 ) : M(k), V(h,w) {} };
Usage
A* a = new R(); (*a)(); a->display();
class R : public M, public V {\fbox{R}
public: R( int k=0, int h=10, int w=20 ) : M(k), V(h,w) {} };
A* a = new R(); (*a)(); a->display();