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| 2 | :- protocol(metap). |
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| 3 | |
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| 4 | :- info([ |
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| 5 | version is 3.0, |
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| 6 | date is 2006/9/17, |
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| 7 | author is 'Paulo Moura', |
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| 8 | comment is 'Useful meta-predicates protocol.']). |
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| 9 | |
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| 10 | :- public(callable/1). |
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| 11 | :- mode(callable(@term), zero_or_one). |
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| 12 | :- info(callable/1, [ |
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| 13 | comment is 'True if the argument can be called as a goal.', |
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| 14 | argnames is ['Term']]). |
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| 15 | |
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| 16 | :- public(filter/3). |
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| 17 | :- meta_predicate(filter(1, *, *)). |
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| 18 | :- mode(filter(+callable, +list, -list), one). |
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| 19 | :- info(filter/3, [ |
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| 20 | comment is 'Returns a list of all list elements that satisfy a predicate.', |
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| 21 | argnames is ['Predicate', 'In', 'Out']]). |
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| 22 | |
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| 23 | :- public(ignore/1). |
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| 24 | :- meta_predicate(ignore(::)). |
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| 25 | :- mode(ignore(@callable), one). |
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| 26 | :- info(ignore/1, [ |
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| 27 | comment is 'Calls Goal once but always succeeds, even if Goal fails.', |
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| 28 | argnames is ['Goal']]). |
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| 29 | |
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| 30 | :- public(map/3). |
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| 31 | :- meta_predicate(map(2, *, *)). |
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| 32 | :- mode(map(+callable, ?list, ?list), zero_or_more). |
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| 33 | :- info(map/3, [ |
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| 34 | comment is 'Maps a predicate over a list of elements.', |
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| 35 | argnames is ['Predicate', 'In', 'Out']]). |
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| 36 | |
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| 37 | :- public(succeeds/2). |
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| 38 | :- meta_predicate(succeeds(1, *)). |
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| 39 | :- mode(succeeds(+callable, +list), zero_or_more). |
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| 40 | :- info(succeeds/2, [ |
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| 41 | comment is 'True if the predicate succeeds for each list element.', |
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| 42 | argnames is ['Predicate', 'List']]). |
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| 43 | |
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| 44 | :- end_protocol. |
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