// A1a.cpp - Question #1

#include <iostream.h>

class B { public: 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 called for D
					// which calls B's void ctor
  D *dptr = new D(d1);		// memory allocated to hold a D object
					// on heap, initialized with compiler gen'd
					// copy constr of d1 which calls compiler gen'd
					// base void ctor
  dptr->mf(3);			// D::mf(3) invoked
}

					// note:
					// default constructor can be called with no args,
					// e.g., can be used as void ctor
					// Stroustrup, pg 243