+void gtk_tree_sortable_sort_column_changed (GtkTreeSortable *sortable);
+gboolean gtk_tree_sortable_get_sort_column_id (GtkTreeSortable *sortable,
+ gint *sort_column_id,
+ GtkSortType *order);
+void gtk_tree_sortable_set_sort_column_id (GtkTreeSortable *sortable,
+ gint sort_column_id,
+ GtkSortType order);
+void gtk_tree_sortable_set_sort_func (GtkTreeSortable *sortable,
+ gint sort_column_id,
+ GtkTreeIterCompareFunc sort_func,
+ gpointer user_data,
+ GtkDestroyNotify destroy);
+void gtk_tree_sortable_set_default_sort_func (GtkTreeSortable *sortable,
+ GtkTreeIterCompareFunc sort_func,
+ gpointer user_data,
+ GtkDestroyNotify destroy);
+gboolean gtk_tree_sortable_has_default_sort_func (GtkTreeSortable *sortable);
+
+
+G_END_DECLS