#include<stdio.h>

/* Instead of Object*/
typedef struct {
  int x;
}Base;
#define initBase {1}

/* Instead of any of our classes that include a field of type Object*/
typedef struct{
  Base b;
  int y;
}Extension;
#define initExtension(z) {initBase,z}

/* Instead of sync that uses a pointer to Object */
int doubleBase(Base *b){
  return 2*b->x;
}

/* Instead of SYNC that uses a pointer to some class that extends Object */
#define DOUBLEBASE(a) doubleBase((Base *)a)

/* Here we see how the type conversion works */
int main(int argc, char* args[]){

  Extension e = initExtension(38);

  /* here you see the 2 level de-referencing e.b.x*/
  printf("%d %d\n",e.b.x,e.y);

  /* here you see the typecast at work! */
  printf("%d\n",DOUBLEBASE(&e));

}