state.h

c++程序

//state.h
#ifndef _STATE_H_ 
#define _STATE_H_

class Context; //前置声明

class State 
{ 
public: 
	State();
	virtual ~State();
	virtual void OperationInterface(Context* ) = 0;
	virtual void OperationChangeState(Context*) = 0;
protected: 
	bool ChangeState(Context* con,State* st);
private: 
	//bool ChangeState(Context* con,State* st);
};

class ConcreteStateA:public State 
{ 
public: 
	ConcreteStateA();
	virtual ~ConcreteStateA();
	virtual void OperationInterface(Context* );
	virtual void OperationChangeState(Context*);
	protected:
private:
};

class ConcreteStateB:public State 
{ 
public: 
	ConcreteStateB();
	virtual ~ConcreteStateB();
	virtual void OperationInterface(Context* );
	virtual void OperationChangeState(Context*);
protected:
private:

}; 

#endif