|
Revision 3011, 0.8 KB
(checked in by pmoura, 2 years ago)
|
|
The metapredicate/1 directive should be considered deprecated. Use the meta_predicate/1 directive instead.
|
-
Property svn:eol-style set to
native
-
Property svn:keywords set to
Author Date Id Revision
|
| Line | |
|---|
| 1 | |
|---|
| 2 | :- object(meta, |
|---|
| 3 | implements(metap)). |
|---|
| 4 | |
|---|
| 5 | :- info([ |
|---|
| 6 | version is 2.0, |
|---|
| 7 | date is 2006/9/17, |
|---|
| 8 | author is 'Paulo Moura', |
|---|
| 9 | comment is 'Some useful meta-predicates.']). |
|---|
| 10 | |
|---|
| 11 | callable(Term) :- |
|---|
| 12 | nonvar(Term), |
|---|
| 13 | functor(Term, Functor, _), |
|---|
| 14 | atom(Functor). |
|---|
| 15 | |
|---|
| 16 | :- meta_predicate(filter(1, *, *)). |
|---|
| 17 | filter(_, [], []) :- !. |
|---|
| 18 | filter(Closure, [Arg| Args], List) :- |
|---|
| 19 | ( call(Closure, Arg) -> |
|---|
| 20 | List = [Arg| Args2] |
|---|
| 21 | ; List = Args2 |
|---|
| 22 | ), |
|---|
| 23 | filter(Closure, Args, Args2). |
|---|
| 24 | |
|---|
| 25 | :- meta_predicate(ignore(::)). |
|---|
| 26 | ignore(Goal) :- |
|---|
| 27 | ( call(Goal) -> |
|---|
| 28 | true |
|---|
| 29 | ; true |
|---|
| 30 | ). |
|---|
| 31 | |
|---|
| 32 | :- meta_predicate(map(2, *, *)). |
|---|
| 33 | map(_, [], []). |
|---|
| 34 | map(Closure, [Old| Olds], [New| News]) :- |
|---|
| 35 | call(Closure, Old, New), |
|---|
| 36 | map(Closure, Olds, News). |
|---|
| 37 | |
|---|
| 38 | :- meta_predicate(succeeds(1, *)). |
|---|
| 39 | succeeds(_, []). |
|---|
| 40 | succeeds(Closure, [Head| Tail]) :- |
|---|
| 41 | call(Closure, Head), |
|---|
| 42 | succeeds(Closure, Tail). |
|---|
| 43 | |
|---|
| 44 | :- end_object. |
|---|
