//Element.h
#ifndef _ELEMENT_H_
#define _ELEMENT_H_

class Visitor;
class Element
{
public:
	virtual ~Element();
	virtual void Accept(Visitor* vis) = 0;
protected:
	Element();
private:
};

class ConcreteElementA:public Element
{
public:
	ConcreteElementA();
	~ConcreteElementA();
	void Accept(Visitor* vis);
protected:
private:
};

class ConcreteElementB:public Element
{
public:
	ConcreteElementB();
	~ConcreteElementB();
	void Accept(Visitor* vis);
protected:
private:
}; 
#endif //~_ELEMENT_H_