:- object(history_point,
imports(point_history),
instantiates(class),
specializes(point)).
:- info([
version is 1.1,
date is 2000/10/31,
author is 'Paulo Moura',
comment is 'Two dimensional point remembering past positions.',
source is 'Example adopted from the SICStus Objects documentation.']).
move(X, Y) :-
::position(OldX, OldY),
^^move(X, Y),
::add_to_history((OldX, OldY)).
print :-
::print_history,
^^print.
instance_base_name(hp).
default_init_option(history-[]).
default_init_option(Default) :-
^^default_init_option(Default).
process_init_option(history-History) :-
::init_history(History).
process_init_option(Option) :-
^^process_init_option(Option).
:- end_object.
