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  1. #include <iostream>
  2.  
  3. class Circle; class Rectangle; 
  4. struct Shape {
  5.   virtual void overlap(Shape* y) =0; //{ std::cout << "Circle, Shape" << std::endl;  }
  6.   virtual void overlap(Circle* x){};
  7.   virtual void overlap(Rectangle* x){};
  8. };
  9.  
  10. struct Circle: Shape {
  11.   void overlap(Shape* y) { y->overlap(this); }
  12.   void overlap(Circle* y) { std::cout << "Circle, Circle" << std::endl; }
  13.   void overlap(Rectangle* y) { std::cout << "Circle, Rectangle" << std::endl; }
  14. };
  15. struct Rectangle: Shape {
  16.   void overlap(Shape* y) { y->overlap(this); }
  17.   void overlap(Circle* y) { std::cout << "Rectangle, Circle" << std::endl; }
  18.   void overlap(Rectangle* y) { std::cout << "Rectangle, Rectangle" << std::endl; }
  19. };
  20.  
  21. //void Shape::overlap(Circle*x) { x->overlap(this); }
  22. void overlap(Shape* x, Shape* y) { std::cout << "Shape, Shape" << std::endl; }
  23. void overlap(Circle* x, Shape* y) { std::cout << "Circle, Shape" << std::endl; }
  24. void overlap(Circle* x, Circle* y) { std::cout << "Circle, Circle" << std::endl; }
  25.  
  26. int main() {
  27.   Shape* x = new Circle();
  28.   Shape* y = new Circle();
  29.   Shape* z = new Rectangle(); 
  30.   std::cout<<"1-----"<<std::endl; 
  31.   x->overlap(y);
  32.   overlap(x, y);
  33.   std::cout<<"2-----"<<std::endl; 
  34.   x->overlap(z);
  35.   overlap(x, z);
  36.  
  37.   return 0;
  38. }
Success #stdin #stdout 0s 4404KB
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Standard input is empty
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1-----
Circle, Circle
Shape, Shape
2-----
Rectangle, Circle
Shape, Shape
https://ideone.com/Cw4Z1f
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
public

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