AtDataSubject.h

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#ifndef ATDATASUBJECT_H
#define ATDATASUBJECT_H
 
#include <set>
 
namespace DataHandling {
class AtObserver;
 
class AtSubject {
private:
   std::set<AtObserver *> fObservers;
 
protected:
   AtSubject() = default;
 
public:
   virtual ~AtSubject() = default;
 
   void Attach(AtObserver *observer);
   void Detach(AtObserver *observer) { fObservers.erase(observer); }
   void Notify();
};
 
template <typename T>
class AtSimpleType : public AtSubject {
protected:
   T fData;
 
public:
   AtSimpleType(T data) { fData = data; } // Must use assigment operator for primitive types.
   T Get() const { return fData; }
   void Set(T data, bool notify = true)
   {
      if (fData == data)
         return;
      fData = data;
      if (notify)
         Notify();
   }
};
 
} // namespace DataHandling
#endif