58 lines
1011 B
Plaintext
58 lines
1011 B
Plaintext
|
|
||
|
|
:- object(point,
|
||
|
|
instantiates(class),
|
||
|
|
specializes(object)).
|
||
|
|
|
||
|
|
|
||
|
|
:- info([
|
||
|
|
version is 1.1,
|
||
|
|
date is 2000/10/31,
|
||
|
|
authors is 'Paulo Moura',
|
||
|
|
comment is 'Two dimensional point class.',
|
||
|
|
source is 'Example adopted from the SICStus Objects documentation.']).
|
||
|
|
|
||
|
|
|
||
|
|
:- public(move/2).
|
||
|
|
:- mode(move(+integer, +integer), zero_or_one).
|
||
|
|
|
||
|
|
:- public(position/2).
|
||
|
|
:- mode(position(?integer, ?integer), one).
|
||
|
|
|
||
|
|
:- private(position_/2).
|
||
|
|
:- dynamic(position_/2).
|
||
|
|
:- mode(position_(?integer, ?integer), one).
|
||
|
|
|
||
|
|
|
||
|
|
move(X, Y) :-
|
||
|
|
::retractall(position_(_, _)),
|
||
|
|
::assertz(position_(X, Y)).
|
||
|
|
|
||
|
|
|
||
|
|
position(X, Y) :-
|
||
|
|
::position_(X, Y).
|
||
|
|
|
||
|
|
|
||
|
|
print :-
|
||
|
|
self(Self),
|
||
|
|
::position_(X, Y),
|
||
|
|
writeq(Self), write(' @ '), write((X, Y)), nl.
|
||
|
|
|
||
|
|
|
||
|
|
default_init_option(position-(0, 0)).
|
||
|
|
|
||
|
|
default_init_option(Default) :-
|
||
|
|
^^default_init_option(Default).
|
||
|
|
|
||
|
|
|
||
|
|
process_init_option(position-(X, Y)) :-
|
||
|
|
::assertz(position_(X, Y)).
|
||
|
|
|
||
|
|
process_init_option(Option) :-
|
||
|
|
^^process_init_option(Option).
|
||
|
|
|
||
|
|
|
||
|
|
instance_base_name(p).
|
||
|
|
|
||
|
|
|
||
|
|
:- end_object.
|