change cclass so that the internal structure is no longer visible by the rest of the code

src/cclass.c

@@ -34,9 +34,10 @@ void *
 _new(const CCLASS _class, ...)
 {
     const CCLASS class = _class;
-    void * object      = calloc(1, class->size);
+    void * object      = calloc(1, class->size + sizeof(CCLASS));
 
-    * (const struct _CCLASS **) object = class;
+    * (const struct _CCLASS **)object = class;
+    object += sizeof(CCLASS);
 
     if (class->__construct) {
         va_list params;
@@ -53,9 +54,10 @@ void *
 _newFromJson(const CCLASS _class, struct json_object * json)
 {
     const CCLASS class = _class;
-    void * object      = calloc(1, class->size);
+    void * object      = calloc(1, class->size + sizeof(CCLASS));
 
     * (const struct _CCLASS **) object = class;
+    object += sizeof(CCLASS);
 
     if (class->__jsonConst && json) {
         class->__jsonConst(object, json);
@@ -67,7 +69,7 @@ _newFromJson(const CCLASS _class, struct json_object * json)
 int
 _instanceOf(const CCLASS _class, void * _object)
 {
-    const CCLASS * class = _object;
+    const CCLASS * class = _object - sizeof(CCLASS);
 
     return (class && _class == *class);
 }
@@ -76,7 +78,7 @@ _instanceOf(const CCLASS _class, void * _object)
 void
 clear(void * _object)
 {
-    const CCLASS * class = _object;
+    const CCLASS * class = _object - sizeof(CCLASS);
 
     if (_object && *class && (*class)->__clear) {
         (*class)->__clear(_object);
@@ -86,20 +88,20 @@ clear(void * _object)
 void
 delete(void * _object)
 {
-    const CCLASS * class = *(void**)_object;
+    const CCLASS * class = (*(void**)_object) - sizeof(CCLASS);
 
     if (*(void**)_object && *class && (*class)->__destruct) {
         (*class)->__destruct(*(void**)_object);
     }
 
-    free(*(void**)_object);
+    free((void *)class);
     *(void**)_object = NULL;
 }
 
 void
 toJson(void * _object, struct json_object ** json)
 {
-    const CCLASS * class = _object;
+    const CCLASS * class = _object - sizeof(CCLASS);
 
     if (_object && *class && (*class)->__toJson) {
         (*class)->__toJson(_object, json);
@@ -109,7 +111,7 @@ toJson(void * _object, struct json_object ** json)
 int
 isObject(void * _object)
 {
-    const CCLASS * class = _object;
+    const CCLASS * class = _object - sizeof(CCLASS);
 
     return (_object && (*class) && CCLASS_MAGIC == (*class)->magic);
 }