#include <iostream>

struct Object {  virtual void foo() { std::cout << "Object::foo();" << std::endl; } };
struct PhysicsObject: Object {  virtual void foo() { std::cout << "PhysicsObject::foo();" << std::endl; } };
struct Ball: PhysicsObject {  virtual void foo() { std::cout << "Ball::foo();" << std::endl; } };
struct SoftBall: Ball {  virtual void foo() { std::cout << "SoftBall::foo();" << std::endl; } };


int main()
{
    Object* o = new SoftBall;

    o->foo();

    delete o;

    return 0;
}

SoftBall::foo();