+#define GIS_TYPE_CALLBACK (gis_callback_get_type())
+#define GIS_CALLBACK(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), GIS_TYPE_CALLBACK, GisCallback))
+#define GIS_IS_CALLBACK(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), GIS_TYPE_CALLBACK))
+#define GIS_CALLBACK_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GIS_TYPE_CALLBACK, GisCallbackClass))
+#define GIS_IS_CALLBACK_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIS_TYPE_CALLBACK))
+#define GIS_CALLBACK_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GIS_TYPE_CALLBACK, GisCallbackClass))