/* Mystery.cpp, by M. Hazen after M. Winstanley
   CSE 374 class inheritance.
*/

#include <iostream>
    
using namespace std;
    
class A {
public:      
  A() { cout << "a()" << endl; }
  virtual ~A() { cout << "~a" << endl; }
  virtual void m1() { cout << "A1" << endl; }
  virtual void m2() { cout << "A2" << endl; }
};

class B : public A {
public:
  B() { cout << "b()" << endl; }
  virtual ~B() { cout << "~b" << endl; }
  virtual void m1() override { cout << "B1" << endl; }
  virtual void m2() override { cout << "B2" << endl; A::m2();}
  void m3() { cout << "B3" << endl; }
  void m4() { A::m1(); }
};

int main() {
  A* x = new A();
  B* y = new B();
  A* z = new B();  // pointer of type A*, class of type B
  cout << "Calling on A" << endl;
  x->m1();
  x->m2();
  cout << "calling on B" << endl;
  y->m2();
  y->m3();
  y->m4();
  cout << "call virtual m2" << endl;
  z->m2();
  
  cout << "destructing" << endl;
  delete x;
  delete y;
  delete z;

}