Refactor: DECLARE_DERIVABLE GncTreeModel < GObject

gnucash/gnome-utils/gnc-tree-model.h

@@ -41,36 +41,17 @@ G_BEGIN_DECLS
 
 /* type macros */
 #define GNC_TYPE_TREE_MODEL            (gnc_tree_model_get_type ())
-#define GNC_TREE_MODEL(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GNC_TYPE_TREE_MODEL, GncTreeModel))
-#define GNC_TREE_MODEL_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GNC_TYPE_TREE_MODEL, GncTreeModelClass))
-#define GNC_IS_TREE_MODEL(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GNC_TYPE_TREE_MODEL))
-#define GNC_IS_TREE_MODEL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GNC_TYPE_TREE_MODEL))
-#define GNC_TREE_MODEL_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GNC_TYPE_TREE_MODEL, GncTreeModelClass))
+G_DECLARE_DERIVABLE_TYPE (GncTreeModel, gnc_tree_model, GNC, TREE_MODEL, GObject)
+
 #define GNC_TREE_MODEL_NAME            "GncTreeModel"
 
 /* typedefs & structures */
 
-/** The instance data structure for a generic tree model. */
-typedef struct
-{
-    GObject g_object;		/**< The parent object data. */
-} GncTreeModel;
-
-
 /** The class data structure for a generic tree model. */
-typedef struct
+struct _GncTreeModelClass
 {
     GObjectClass g_object;	/**< The parent object data. */
-} GncTreeModelClass;
-
-
-
-/** Get the type of a generic tree model plugin.
- *
- *  @return A GType.
- */
-GType gnc_tree_model_get_type (void);
-
+};
 
 G_END_DECLS