#include <stdio.h>
#include <iostream>
/** 
*Shape
*/
class CShape
{
public:
 CShape(){}
 virtual ~CShape(){}
 virtual void Draw() = 0;
};
/**
*Point
*/
class CPoint : public CShape
{
public:
 CPoint(){}
 ~CPoint(){}
 void Draw()
 {
 printf("Hello! I am Point!/n");
 }
};
/**
*Line
*/
class CLine : public CShape
{
public:
 CLine(){}
 ~CLine(){}
 void Draw()
 {
 printf("Hello! I am Line!/n");
 }
};

void main()
{
 CShape* shape = new CPoint();
 //draw point
 shape->Draw();//在这里shape将会调用CPoint的Draw()函数
 delete shape;
 shape = new CLine();
 //draw Line
 shape->Draw();//而在这里shape将会调用CLIne 的Draw()函数
 delete shape;
 return ;
}

template <class T>
void DrawShape(T* t)
{
 t->Draw();
}

void main()
{
 CShape* shape = new CPoint();
 //draw point
 shape->Draw();
 DrawShape<CPoint>((CPoint*)shape);
 delete shape;
 shape = new CLine();
 //draw Line
 shape->Draw();
 DrawShape<CLine>((CLine*)shape);
 delete shape;
 
 return ;
}