Include Paulo Moura's Logtalk OO LP system
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@53 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
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57
Logtalk/examples/points/point.lgt
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57
Logtalk/examples/points/point.lgt
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:- object(point,
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instantiates(class),
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specializes(object)).
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:- info([
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version is 1.1,
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date is 2000/10/31,
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authors is 'Paulo Moura',
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comment is 'Two dimensional point class.',
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source is 'Example adopted from the SICStus Objects documentation.']).
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:- public(move/2).
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:- mode(move(+integer, +integer), zero_or_one).
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:- public(position/2).
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:- mode(position(?integer, ?integer), one).
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:- private(position_/2).
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:- dynamic(position_/2).
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:- mode(position_(?integer, ?integer), one).
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move(X, Y) :-
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::retractall(position_(_, _)),
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::assertz(position_(X, Y)).
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position(X, Y) :-
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::position_(X, Y).
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print :-
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self(Self),
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::position_(X, Y),
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writeq(Self), write(' @ '), write((X, Y)), nl.
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default_init_option(position-(0, 0)).
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default_init_option(Default) :-
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^^default_init_option(Default).
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process_init_option(position-(X, Y)) :-
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::assertz(position_(X, Y)).
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process_init_option(Option) :-
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^^process_init_option(Option).
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instance_base_name(p).
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:- end_object.
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