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#include "stdio.h"
#include "stdlib.h"


#define XenObject_HANDLE unsigned char type; \
        struct XenObject * next; \
        struct XenObject * prev;

struct XenObject
{
    XenObject_HANDLE
};

typedef struct XenObject XenObject;






#define XenObject_GETTYPE(xo) xo->type

#define XenObject_SETTYPE(xo, t) xo->type = t

#define XenObject_SAMETYPE(xo1, xo2) xo1->type == xo2->type

#define XenObject_CASTOBJ(xo) (XenObject*)xo

#define XenObject_CONNECT_NEXT(xo1, xo2) do { \
                    xo1->next = xo2; \
                    xo2->prev = xo1; } while(0)
                    
#define XenObject_CONNECT_PREV(xo1, xo2) do { \
                    xo1->prev = xo2; \
                    xo2->next = xo1; } while(0)
                    
#define XenObject_APPEND(xo1, xo2) do { \
     while(xo1->next != NULL) \
     { \
     xo1 = xo1->next; \
     } \
     xo1->next = xo2; \
     xo2->prev = xo1; \
     }while(0)
     
     

int main(void) {
  XenObject* one = malloc(sizeof(XenObject));
  XenObject* two = malloc(sizeof(XenObject));
  XenObject_SETTYPE(two, 3);
  XenObject_CONNECT_NEXT(one, two);
  XenObject* three = malloc(sizeof(XenObject));
  XenObject_SETTYPE(three, 7);
  XenObject_APPEND(one, three);
  printf("Hello World\n");
  printf("two's type is %d", XenObject_GETTYPE(one->next));
  return 0;
}