// B6.cpp - Question #6

#include <iostream.h>

class B { public: virtual void mf(int n); protected: int state; };

void B::mf(int n) { 
  cout << "  B::mf(" << n << ") invoked\n"; state = n;
}

class D : public B { public: void mf(int n); };

void D::mf(int n) {
  cout << "  D::mf(" << n << ") invoked\n"; state = -n;
}

void main() {

  D d1;				// compiler gen'd void ctor for D called
					// which calls compiler gen'd void ctor for B
  D da[3] = { d1, d1, d1 };	// compiler gen'd copy ctor for D called which
					// calls compiler gen'd void ctor for B
  da[0].mf(3);			// D object in da[0] invokes its mf
}