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yap-6.3/Logtalk/library/observer.lgt

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:- category(observer).
:- info([
version is 1.0,
author is 'Paulo Moura',
date is 03/02/09,
comment is 'Smalltalk dependent protocol.']).
:- public(update/1).
:- mode(update(?nonvar), zero_or_one).
:- info(update/1,
[comment is 'Called when an observed object is updated.',
argnames is ['Change']]).
update(_).
:- end_category.