1 #include <list>
2
3 class Subject;
4
5 class Observer{
6 public:
7 virtual ~Observer(){};
8 virtual void update(Subject * sub){};
9 protected:
10 Observer(){};
11
12 };
13
14 class Subject {
15 public:
16 Subject() { };
17 virtual ~Subject() { };
18 virtual void attach(Observer* ob) {
19 this->_observers.push_back(ob);
20 }
21 void detach(Observer* ob) {
22 this->_observers.remove(ob);
23 }
24
25 void notify(){
26 for(auto ob : _observers){
27 ob->update(this);
28 }
29 }
30 private:
31 std::list<Observer*> _observers;
32 };
