+#define _ATK_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE, flags) \
+\
+static void type_name##_init (TypeName *self); \
+static void type_name##_class_init (TypeName##Class *klass); \
+static gpointer type_name##_parent_class = NULL; \
+static void type_name##_class_intern_init (gpointer klass) \
+{ \
+ type_name##_parent_class = g_type_class_peek_parent (klass); \
+ type_name##_class_init ((TypeName##Class*) klass); \
+} \
+\
+ATK_AVAILABLE_IN_ALL \
+GType \
+type_name##_get_type (void) \
+{ \
+ static volatile gsize g_define_type_id__volatile = 0; \
+ if (g_once_init_enter (&g_define_type_id__volatile)) \
+ { \
+ AtkObjectFactory *factory; \
+ GType derived_type; \
+ GTypeQuery query; \
+ GType derived_atk_type; \
+ GType g_define_type_id; \
+\
+ /* Figure out the size of the class and instance we are deriving from */ \
+ derived_type = g_type_parent (TYPE); \
+ factory = atk_registry_get_factory (atk_get_default_registry (), \
+ derived_type); \
+ derived_atk_type = atk_object_factory_get_accessible_type (factory); \
+ g_type_query (derived_atk_type, &query); \
+\
+ g_define_type_id = \
+ g_type_register_static_simple (derived_atk_type, \
+ g_intern_static_string (#TypeName), \
+ query.class_size, \
+ (GClassInitFunc) type_name##_class_intern_init, \
+ query.instance_size, \
+ (GInstanceInitFunc) type_name##_init, \
+ (GTypeFlags) flags); \
+ { /* custom code follows */
+#define _ATK_DEFINE_TYPE_EXTENDED_END() \
+ /* following custom code */ \
+ } \
+ g_once_init_leave (&g_define_type_id__volatile, g_define_type_id); \
+ } \
+ return g_define_type_id__volatile; \
+} /* closes type_name##_get_type() */