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yap-6.3/Logtalk/examples/bricks/brick.lgt
pmoura 75392e54c7 Logtalk 2.15.0 release files.
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@757 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2003-02-05 00:15:28 +00:00

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:- object(brick,
instantiates(class),
specializes(object)).
:- info([
version is 1.1,
date is 2000/10/31,
author is 'Paulo Moura',
comment is 'Two-dimensional brick (or should I say square?) class.']).
:- public(position/2).
:- mode(position(?integer, ?integer), zero_or_one).
:- info(position/2, [
comment is 'Brick current position.',
argnames is ['X', 'Y']]).
:- private(position_/2).
:- dynamic(position_/2).
:- mode(position_(?integer, ?integer), zero_or_one).
:- info(position_/2, [
comment is 'Stores brick current position.',
argnames is ['X', 'Y']]).
:- public(move/2).
:- mode(move(+integer, +integer), one).
:- info(move/2, [
comment is 'Moves a brick to a new position.',
argnames is ['X', 'Y']]).
position(X, Y) :-
::position_(X, Y).
move(X, Y) :-
::retractall(position_(_, _)),
::assertz(position_(X, Y)).
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).
valid_init_option(position-(X, Y)) :-
!,
integer(X),
integer(Y).
valid_init_option(Option) :-
^^valid_init_option(Option).
instance_base_name(b).
:- end_object.