#include <iostream>
 
using namespace std;
class SBase
{
  virtual void work()=0;
};
 
class PBase
{
  virtual void doit(SBase&)=0;
};
class P1: public PBase
{
  public:
  void doit(SBase&s) {cout << "P1" << '\t' << &s <<'\n';};
};
class P2: public P1
{
  public:
  void doit(SBase&s) {cout << "P2" << '\t' << &s <<'\n';};
};
 
class S : public SBase
{
  public:
  void work() {
  P1 p1;
  P2 p2;
  p1.doit(*this);
  p2.doit(*this);
  }
};
 
int main()
{
    S s;
    s.work();
    return 0;
}
 

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