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/*
This category defines a predicate, interface/0, that prints an object
interface, i.e. predicate names and the corresponding scope properties.

We need to encapsulate the interface/0 predicate in a category instead
of just defining it in a root object in order to be able to list private
object predicates.
*/

:- category(interface).

	:- public(interface/0).

	interface :-
		% list all predicates visible in "this" (except this one)
		current_predicate(Name/Arity),
			functor(Pred, Name, Arity),
			Pred \== interface,
			predicate_property(Pred, scope(Scope)),
			writeq(Name/Arity), write(' - '), writeq(Scope), nl,
		fail.
	interface.

:- end_category.
