lmitchell

  for (; vm->prog->instr[*instr_idx] != -0x1; ++(*instr_idx))
    tvm_step(vm, instr_idx);

  class Vehicle {
    virtual void Collide(Vehicle other);
  }

  class Car {
    void Collide(Truck other) { /* hit a truck */ }
    void Collide(Car other) { /* hit another car */ }
  }

  class Truck {
    void Collide(Truck other) { /* hit another truck */ }
    void Collide(Car other) { /* hit a car */ }
  }

  Vehicle c = Car();
  Vehicle t = Truck();

  c.Collide(t); // with multiple dispatch, calls Car::Collide(Truck)