#include "observer.h"


int main()
{

  ConcreteSubject s1("s1");
  ConcreteSubject s2("s2");
  ConcreteObserver o1("o1");
  ConcreteObserver o2("o2");
  ConcreteObserver o3("o3");

  o1.AttachSubject(&s1);
  o1.AttachSubject(&s2);
  o2.AttachSubject(&s1);
  o3.AttachSubject(&s2);

  s1.SetState(5);
  s2.SetState(2);
}

/* program output:

Observer o1 queries Subject s1 for new state 5
Observer o2 queries Subject s1 for new state 5
Observer o1 queries Subject s2 for new state 2
Observer o3 queries Subject s2 for new state 2

*/