//Command.h
#ifndef _COMMAND_H_ 
#define _COMMAND_H_

class Reciever;
class Command 
{ 
public: 
	virtual ~Command();
	virtual void Excute() = 0;
protected: 
	Command();
private:
};

class ConcreteCommand:public Command 
{ 
public: 
	ConcreteCommand(Reciever* rev);
	~ConcreteCommand();
	void Excute();
protected:
private: 
	Reciever* _rev; 
};

//下面是通過(guò)模板的方式來(lái)參數(shù)化請(qǐng)求的接收者
template <class Reciever> class SimpleCommand:public Command 
{ 
public: 
	typedef void (Reciever::* Action)();

	SimpleCommand(Reciever* rev,Action act) 
	{ 
		_rev = rev;
		_act = act; 
	}

    virtual void Excute() 
	{ 
		(_rev->* _act)(); 
	}

    ~SimpleCommand() 
	{ 
		delete _rev; 
	}
protected:
private:
	Reciever* _rev;
	Action _act; 
};
#endif //~_COMMAND_H_