22 lines
385 B
Plaintext
22 lines
385 B
Plaintext
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:- object(list(_type),
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extends(list)).
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:- info([
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version is 1.0,
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author is 'Paulo Moura',
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date is 2006/1/29,
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comment is 'List predicates with elements constrained to a single type.']).
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valid(List) :-
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nonvar(List),
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parameter(1, Type),
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\+ \+ valid(List, Type).
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valid([], _).
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valid([Value| List], Type) :-
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Type::valid(Value),
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valid(List, Type).
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:- end_object.
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