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yap-6.3/Logtalk/examples/roots/abstract_class.lgt

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:- object(abstract_class,
implements(abstract_classp),
instantiates(class),
specializes(object)).
:- info([
version is 2,
authors is 'Paulo Moura',
date is 2000/7/24,
comment is 'Default metaclass for all abstract classes.']).
metaclass :-
self(Self),
instantiates_class(Class, Self),
this(This),
Class::ancestor(This).
abstract_class :-
self(Self),
Self \= abstract_class.
strict_instance :-
fail.
:- end_object.