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struct Point{
int x, y;
};
/*Shape*/
/*----------------------------------------------------------------*/
struct Shape {
struct Methods* methods;
};
struct Methods {//½«C++¶ÔÓ¦ÀàÖÐËùÓгÉÔ±º¯Êý·â×°µ½Ò»¸ö½á¹¹ÌåÀïÃæ
float (*getCircle)(Shape * shape);
float (*getArea)(Shape * shape);
void (*draw)(Shape * shape);
void (*move)(Shape * shape);
};
////////////////C++ Counterpart of above code//////////////////
class Shape {
public:
virtual float getCircle() = 0;
virtual float getArea() = 0;
virtual void draw() = 0;
virtual void move() = 0;
};
///////////////////////////////////////////////////////////////
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/*----------------------------------------------------------------*/
/*Rectangle*/
struct Rectangle {
struct Methods * methods; //°üº¬·â×°ºóµÄ³ÉÔ±º¯Êý½á¹¹ÌåµÄÖ¸Õë
Point leftTop; //ShapeÖ®ÍâÅÉÉúµÄ³ÉÔ±±äÁ¿
Point rightBottom; //ShapeÖ®ÍâÅÉÉúµÄ³ÉÔ±±äÁ¿
};
float Rectangle_getCircle(Shape * shape)
{
Rectangle * r = (Rectangle *) shape;
return (r->rightBottom.x - r->leftTop.x +
r->rightBottom.y - r->leftTop.y) * 2;
}
float Rectangle_getArea(Shape * shape){}
void Rectangle_draw (Shape * shape){}
void Rectangle_move(Shape * shape){}
struct Methods rectangleMethods = {
&Rectangle_getCircle,
&Rectangle_getArea,
&Rectangle_draw,
&Rectangle_move,
};
////////////////C++ Counterpart of above code//////////////////
class Rectangle : public Shape {
Point leftTop;
Point rightBottom;
public:
virtual float getCircle();
virtual float
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