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yap-6.3/Logtalk/examples/reflection/abstract_class.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(abstract_class,
instantiates(class),
specializes(object)).
:- info([
author is 'Paulo Moura',
version is 1.0,
date is 2000/4/22,
comment is 'Default metaclass for all abstract classes.']).
:- public(metaclass/0).
:- mode(metaclass, zero_or_one).
:- public(abstract_class/0).
:- mode(abstract_class, zero_or_one).
abstract_class :-
self(Self),
Self \= abstract_class.
metaclass :-
self(Self),
once((
instantiates_class(Class, Self),
Class::current_predicate(abstract_class/0))).
strict_instance :-
fail.
:- end_object.