Object.c

/*
htop - Object.c
(C) 2004-2012 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/

#include "Object.h"

/*{
#include "RichString.h"
#include "XAlloc.h"
#include <stdbool.h>

typedef struct htop_object_class ObjectClass;
typedef struct htop_object Object;

typedef void (*ObjectInheritFunction)(ObjectClass *);
typedef void(*Object_Display)(Object*, RichString*);
typedef long(*Object_Compare)(const void*, const void*);
typedef void(*Object_Delete)(Object*);

#define Object_getClass(obj_)         ((Object*)(obj_))->klass
#define Object_setClass(obj_, class_) do { \
      ObjectClass *c = (ObjectClass *)(class_); \
      ((Object *)(obj_))->klass = c; \
      if(c->extends && ((ObjectClass *)c->extends)->inherit) { \
         ((ObjectClass *)c->extends)->inherit(c); \
      } \
   } while(false)

#define Object_delete(obj_)           Object_getClass(obj_)->delete((Object*)(obj_))
#define Object_displayFn(obj_)        Object_getClass(obj_)->display
#define Object_display(obj_, str_)    Object_getClass(obj_)->display((Object*)(obj_), str_)
#define Object_compare(obj_, other_)  Object_getClass(obj_)->compare((const void*)(obj_), other_)

#define Class(class_)                 ((ObjectClass*)(&(class_ ## _class)))

#define AllocThis(class_) (class_*) xMalloc(sizeof(class_)); Object_setClass(this, Class(class_));
 
struct htop_object_class {
   void *extends;
   ObjectInheritFunction inherit;
   Object_Display display;
   Object_Delete delete;
   Object_Compare compare;
};

struct htop_object {
   ObjectClass* klass;
};

}*/

ObjectClass Object_class = {
   .extends = NULL
};

#ifndef NDEBUG

bool Object_isA(Object* o, const ObjectClass* klass) {
   if (!o)
      return false;
   const ObjectClass* type = o->klass;
   while (type) {
      if (type == klass)
         return true;
      type = type->extends;
   }
   return false;
}

#endif