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49 lines
1.1 KiB
Mathematica
49 lines
1.1 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module mpj5.
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:- interface.
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:- import_module bool.
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:- import_module list.
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:- typeclass coll(E, C) <= (C -> E) where [
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func e = C,
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func i(E, C) = C,
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pred m(E::in, C::in) is semidet
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].
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:- type w(T)
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---> w(T).
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:- type cf(T)
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---> cf(func(T) = bool).
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:- instance coll(int, int).
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% We don't support duplicated type vars in instances yet, so these cases
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% are disabled for the moment.
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% :- instance coll(w(T), list(T)).
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% :- instance coll(w(T), cf(T)).
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:- implementation.
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:- import_module int.
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:- instance coll(int, int) where [
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(e = 0),
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(i(N, B) = B \/ (1 << N)),
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(m(N, B) :- B /\ (1 << N) \= 0)
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].
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% :- instance coll(w(T), list(T)) where [
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% (e = []),
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% (i(w(E), L) = [E | L]),
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% (m(w(E), L) :- list.member(E, L))
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% ].
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% :- instance coll(w(T), cf(T)) where [
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% (e = cf(func(_) = no)),
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% (i(w(E), cf(F)) = cf(func(X) = ( X = E -> yes ; F(X) ))),
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% (m(w(E), cf(F)) :- F(E) = yes)
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% ].
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