Gtk.TreeSortable::get_sort_column_id

function vfunc_get_sort_column_id():Boolean {
}

Fills in sort_column_id and order with the current sort column and the order. It returns true unless the sort_column_id is %GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID or %GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID.