#ifndef SUBJECT_H
#define SUBJECT_H

class Observer;

#include <set>

class Hint {
  public:
    virtual ~Hint() {}
};

class Subject {
  public:
    typedef std::set<Observer *> ObsList;
    void attach(Observer &obs);

  protected:
    void notify(const Hint &) const;

  private:
    ObsList myObservers;
};

#endif