/* Copyright (c) 2009 The Khronos Group Inc.

  *

  * Permission is hereby granted, free of charge, to any person obtaining a

  * copy of this software and/or associated documentation files (the

  * "Materials"), to deal in the Materials without restriction, including

  * without limitation the rights to use, copy, modify, merge, publish,

  * distribute, sublicense, and/or sell copies of the Materials, and to

  * permit persons to whom the Materials are furnished to do so, subject to

  * the following conditions:

  *

  * The above copyright notice and this permission notice shall be included

  * in all copies or substantial portions of the Materials.

  *

  * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

  * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

  */

 #ifndef OWFOBJECT_H_

 #define OWFOBJECT_H_

 #include <stdlib.h>

 #include "owftypes.h"

 #include "owfdebug.h"

 #ifdef __cplusplus

 extern "C"

 {

 #endif

 typedef void (*DESTRUCTOR)(void*);

 typedef void (*CONSTRUCTOR)(void*);

 typedef struct {

     const char*             type;

     DESTRUCTOR              destructor;

     OWFuint32               referenceCount;

     void*                   payload;

 } OWF_OBJECT;

 #define TYPE(x)             "" # x "_type"

 /*! returns field offset within structure */

 #define FOFF(x,y)           ((OWFuint32) &(((x*) 0x1000)->y) - 0x1000)

 /*! returns pointer to wrapper object which holds object x */

 #define _O(x)               ((OWF_OBJECT*) ((OWFuint32)(x) -\

                                            FOFF(OWF_OBJECT,payload)))

 /*! create new object instance */

 #define CREATE(x)           (x*) OWF_Object_Construct(sizeof(x), TYPE(x), \

                                                       & x##_Ctor, & x##_Dtor)

 #define REFCOUNT(x)         ((x) ? _O(x)->referenceCount : 0xFFFFFFFF)

 /*! get the type of the contained object  */

 #define TYPEOF(x)           (_O(x)->type)

 /*! increment object reference count  */

 #define ADDREF(x,y) \

     if (y) {\

          _O(y)->referenceCount++; \

          DPRINT(("ADDREF: ref count of %s(%p) is now %d\n", TYPEOF(y), y, \

                  REFCOUNT(y)));\

     }\

     x = y;

 /*! decrement object reference count, call destructor if count reaches zero  */

 #define REMREF(x) \

     if (x) {\

         --_O(x)->referenceCount; \

         DPRINT(("REMREF: ref count of %s(%p) is now %d\n", TYPEOF(x), x, \

                 REFCOUNT(x))); \

         if (0 == _O(x)->referenceCount) {\

             if (_O(x)->destructor) {\

                 _O(x)->destructor(x);\

             }\

             xfree(_O(x));\

         }\

         x = NULL;\

     }

 #define DESTROY(x) \

     REMREF(x); \

     x = NULL;

 OWF_API_CALL void*

 OWF_Object_Construct(size_t size,

                      const char* type,

                      CONSTRUCTOR ctor,

                      DESTRUCTOR dtor);

 #ifdef __cplusplus

 }

 #endif

 #endif /* OWFOBJECT_H_ */