src/obj.h

   1 /*
   2  * ion/obj.h
   3  *
   4  * Copyright (c) Tuomo Valkonen 1999-2001.
   5  * See the included file LICENSE for details.
   6  */
   7
   8 #ifndef INCLUDED_WOBJ_H
   9 #define INCLUDED_WOBJ_H
  10
  11 #define OBJDESCR(TYPE) TYPE##_objdescr
  12
  13 #define WOBJ_IS(OBJ, TYPE) wobj_is((WObj*)OBJ, &OBJDESCR(TYPE))
  14 #define WOBJ_CAST(OBJ, TYPE) (TYPE*)wobj_cast((WObj*)OBJ, &OBJDESCR(TYPE))
  15
  16 #define INTRSTRUCT(STRU)                                    \
  17         struct STRU##_struct; typedef struct STRU##_struct STRU;
  18 #define DECLSTRUCT(STRU)  \
  19         struct STRU##_struct
  20
  21 #define INTROBJ(OBJ) INTRSTRUCT(OBJ)
  22 #define DECLOBJ(OBJ) extern WObjDescr OBJDESCR(OBJ); DECLSTRUCT(OBJ)
  23
  24 INTROBJ(WObj)
  25 INTRSTRUCT(WObjDescr)
  26
  27 extern bool wobj_is(const WObj *obj, const WObjDescr *descr);
  28 extern const void *wobj_cast(const WObj *obj, const WObjDescr *descr);
  29
  30 DECLOBJ(WObj){
  31         WObjDescr *obj_type;
  32 };
  33
  34 #endif /* INCLUDED_WOBJ_H */