template<class T>
class Point2D:Moveable<Point2D<T>>{
private:
	T x,y;
public:
	Point2D():x(T()),y(T()){}	
	Point2D(const T &a, const T &b): x(a),y(b){}
	T get_x()const{return x;}
	T get_y()const{return y;}
	void set_x(T a){x=a;}
	void set_y(T a){y=a;}
	Point2D<T> operator+(const Point2D<T> &obj){
		return Point3D<T>(x+obj.x,y+obj.get_y());
	}
};

template<class T>
class Line2D:Moveable<Line2D<T>>{
private:
	Point2D<T> *p1,*p2;
public:
	Line2D():p1(),p2(){}
	Line2D(const Point2D<T> &point1, const Point2D<T> &point2):
		p1(&point1),
		p2(&point2)
	{}
	Point2D<T> get_p1() const{return *p1;}
	Point2D<T> get_p2() const{return *p2;}
	void set_p1(const Point2D<T> &p){p1=&p;}
	void set_p2(const Point2D<T> &p){p2=&p;}
};