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//Abstraction.h 
 
#ifndef _ABSTRACTION_H_  
#define _ABSTRACTION_H_ 
 
class AbstractionImp; 
 
class Abstraction  
{  
public:  
	virtual ~Abstraction(); 
	virtual void Operation() = 0; 
protected:  
	Abstraction(); 
private: 
}; 
 
class RefinedAbstraction:public Abstraction  
{  
public:  
	RefinedAbstraction(AbstractionImp* imp); 
	~RefinedAbstraction(); 
	void Operation(); 
protected: 
 
private:  
	AbstractionImp* _imp; 
}; 
 
#endif