handle.h

c++程序

//Handle.h

#ifndef _HANDLE_H_ 
#define _HANDLE_H_

class Handle 
{ 
public: 
	virtual ~Handle();
	virtual void HandleRequest() = 0;
	void SetSuccessor(Handle* succ);
	Handle* GetSuccessor();
protected: 
	Handle();
	Handle(Handle* succ);
private: 
	Handle* _succ; 
};

class ConcreteHandleA:public Handle 
{ 
public: 
	ConcreteHandleA();
	~ConcreteHandleA();
	ConcreteHandleA(Handle* succ);
	void HandleRequest();
protected:
private:
};

class ConcreteHandleB:public Handle 
{ 
public: 
	ConcreteHandleB();
	~ConcreteHandleB();
	ConcreteHandleB(Handle* succ);
	void HandleRequest();
protected:
private:
}; 

#endif