int main()
{
Subject* p = new ConcreateSubject();
Observer *p1 = new ConcreateObserver(p);
Observer *p2 = new ConcreateObserver(p);//等价于Observer *p2 = new ConcreateObserver(); p->Attach(p2);
p->SetState(4);
p->Notify();
std::cout<<"-----------------------"<<std::endl;
p->Detach(p1);
p->SetState(10);
p->Notify();
delete p;
return 0;
}
int main()
{
Observer *p1 = new ConcreateObserver;
Observer *p2 = new ConcreateObserver;
Subject* p = new ConcreateSubject;
p->Attach(p1);
p->Attach(p2);
p->SetState(4);
p->Notify();
p->Detach(p1);
p->SetState(10);
p->Notify();
delete p;
system("pause");
return 0;
}
int main()
{
Observer* p1 = new ConcreteObserverA();
Observer* p2 = new ConcreteObserverB();
Observer* p3 = new ConcreteObserverA();
Subject* pSubject = new ConcreteSubjectA();
pSubject->Attach(p1);
pSubject->Attach(p2);
pSubject->Attach(p3);
pSubject->SetState("old");
pSubject->Notify();
pSubject->SetState("new");
pSubject->Detach(p3);
pSubject->Notify();
cout << "-------------------------------------" << endl;
Base *point=new Derived();
point->print();
return 0;
}
