Applying Observer Pattern in C++ Applications

// Observer.h : interface of the CObserver class
//
/////////////////////////////////////////////////////////////////////////////

#ifndef _OBSERVER
#define _OBSERVER

// Forward declare the class CSubject
class CSubject;

// Class declaration for CObserver
class CObserver
{
	// Destructor
	public :
		virtual ~CObserver();

	// Methods
	public :
		virtual BOOL Update( CSubject * ) = 0;

	// Protected constructor
	protected :
		CObserver();
};
#endif