libtu/obj.h

   1 /*
   2  * libtu/obj.h
   3  *
   4  * Copyright (c) Tuomo Valkonen 1999-2004.
   5  *
   6  * You may distribute and modify this library under the terms of either
   7  * the Clarified Artistic License or the GNU LGPL, version 2.1 or later.
   8  */
   9
  10 #ifndef LIBTU_OBJ_H
  11 #define LIBTU_OBJ_H
  12
  13 #include "types.h"
  14
  15 #define CLASSDESCR(TYPE) TYPE##_classdescr
  16
  17 #define OBJ_IS(OBJ, TYPE) obj_is((Obj*)OBJ, &CLASSDESCR(TYPE))
  18 #define OBJ_CAST(OBJ, TYPE) (TYPE*)obj_cast((Obj*)OBJ, &CLASSDESCR(TYPE))
  19
  20 #define INTRSTRUCT(STRU) \
  21     struct STRU##_struct; typedef struct STRU##_struct STRU
  22 #define DECLSTRUCT(STRU)  \
  23     struct STRU##_struct
  24
  25 #define INTRCLASS(OBJ) INTRSTRUCT(OBJ); extern ClassDescr CLASSDESCR(OBJ)
  26 #define DECLCLASS(OBJ) DECLSTRUCT(OBJ)
  27
  28 INTRSTRUCT(ClassDescr);
  29 INTRCLASS(Obj);
  30 INTRSTRUCT(Watch);
  31
  32 extern bool obj_is(const Obj *obj, const ClassDescr *descr);
  33 extern bool obj_is_str(const Obj *obj, const char *str);
  34 extern const void *obj_cast(const Obj *obj, const ClassDescr *descr);
  35
  36 extern void destroy_obj(Obj *obj);
  37
  38 DECLCLASS(Obj){
  39     ClassDescr *obj_type;
  40     Watch *obj_watches;
  41     int flags;
  42 };
  43
  44 #define OBJ_DEST 0x0001
  45 #define OBJ_EXTL_CACHED 0x0002
  46 #define OBJ_EXTL_OWNED 0x0004
  47
  48 #define OBJ_IS_BEING_DESTROYED(OBJ) (((Obj*)(OBJ))->flags&OBJ_DEST)
  49
  50 #define DYNFUN
  51
  52 typedef void WatchHandler(Watch *watch, Obj *obj);
  53
  54 #define WATCH_INIT {NULL, NULL, NULL, NULL}
  55
  56 DECLSTRUCT(Watch){
  57     Obj *obj;
  58     Watch *next, *prev;
  59     WatchHandler *handler;
  60 };
  61
  62 extern bool watch_setup(Watch *watch, Obj *obj,
  63                         WatchHandler *handler);
  64 extern void watch_reset(Watch *watch);
  65 extern bool watch_ok(Watch *watch);
  66 extern void watch_init(Watch *watch);
  67 extern void watch_call(Obj *obj);
  68
  69 #endif /* LIBTU_OBJ_H */