#include <iostream>

using namespace std;

class animal {
public:
  animal() { cout << "animal::ctor" << endl;}
  virtual ~animal() { cout << "animal::dtor" << endl;}
};

class pet {
public:
  pet() { cout << "pet::ctor" << endl;}
  virtual ~pet() { cout << "pet::dtor" << endl;}
};

class dog : public pet {
public:
  dog() { cout << "dog::ctor" << endl;}
  virtual ~dog() { cout << "dog::dtor" << endl;}
};

class petdogs : public dog, public animal {
public:
  petdogs() { cout << "petdogs::ctor" << endl;}
  virtual ~petdogs() { cout << "petdogs::dtor" << endl;}
};

int main() {
  cout << "calling constructor left to right, depth first" << endl;
  petdogs *Lassie = new petdogs;

  cout << "************" << endl;
  cout << "calling destructors right to left, shallow first" << endl;
  delete Lassie;

  return 0;
}