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Revision 4216, 0.6 KB
(checked in by pmoura, 7 months ago)
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Updated the definitions of the predicate valid/1 for the library objects "list", "list(Type)", "numberlist", "set", "set(Type)", "varlist" to fail for lists with unbound tails after discussion with Jan Wielemaker and Ulrich Neumerkel.
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Author Date Id Revision
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| 1 | |
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| 2 | :- object(set(_Type), |
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| 3 | extends(set)). |
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| 4 | |
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| 5 | :- info([ |
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| 6 | version is 1.1, |
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| 7 | author is 'Paulo Moura', |
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| 8 | date is 2008/4/22, |
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| 9 | comment is 'Set predicates with elements constrained to a single type.']). |
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| 10 | |
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| 11 | valid(-) :- % catch variables |
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| 12 | !, |
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| 13 | fail. |
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| 14 | valid([]) :- |
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| 15 | !. |
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| 16 | valid([Element| Set]) :- |
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| 17 | check_order(Set, Element). |
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| 18 | |
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| 19 | check_order(-, _) :- % catch unbound tails |
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| 20 | !, |
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| 21 | fail. |
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| 22 | check_order([], _) :- |
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| 23 | !. |
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| 24 | check_order([Element2| Set], Element1) :- |
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| 25 | parameter(1, Type), |
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| 26 | Type::valid(Element1), |
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| 27 | Type::valid(Element2), |
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| 28 | Element2 @> Element1, |
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| 29 | check_order(Set, Element2). |
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| 30 | |
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| 31 | :- end_object. |
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