#ifndef OBSERVER_H
#define OBSERVER_H

#include <iostream>
#include <string>
#include "Subject.h"
using namespace std;

class Observer {
public:
 virtual void Update(Subject* sub) = 0;
 virtual void PrintInfo() = 0;
 virtual ~Observer();
protected:
 Observer();
 string _st;
};

class ConcreteObserver :public Observer {
public:
 virtual Subject* GetSubject();

 ConcreteObserver(Subject* sub);

 ~ConcreteObserver();

 void Update(Subject* sub);

 void PrintInfo();

private:
 Subject *_sub;
};

#endif //OBSERVER_H