mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-19 11:23:46 +00:00
70 lines
1.6 KiB
Mathematica
70 lines
1.6 KiB
Mathematica
%---------------------------------------------------------------------------%
|
|
% vim: ts=4 sw=4 et ft=mercury
|
|
%---------------------------------------------------------------------------%
|
|
|
|
:- module constraint_proof_bug_lib.
|
|
|
|
:- interface.
|
|
|
|
:- type date.
|
|
:- type code.
|
|
|
|
:- type field(T1, T2)
|
|
---> d(T1)
|
|
; c(T2).
|
|
|
|
:- type dep_op == string.
|
|
|
|
:- typeclass constrainable(T) where [
|
|
pred apply_op(T::in, dep_op::in, T::in) is semidet
|
|
].
|
|
|
|
:- instance constrainable(date).
|
|
:- instance constrainable(code).
|
|
:- instance constrainable(field(T, T2))
|
|
<= (constrainable(T), constrainable(T2)).
|
|
|
|
:- pred get_date_date(int::out, int::out, int::out, date::in) is det.
|
|
|
|
:- implementation.
|
|
|
|
:- type code == int.
|
|
:- type date
|
|
---> d(int).
|
|
|
|
get_date_date(Y, M, D, _Date) :-
|
|
Y=1999, M=6, D=25.
|
|
|
|
:- instance constrainable(date) where [
|
|
pred(apply_op/3) is apply_op_dates
|
|
].
|
|
|
|
:- pred apply_op_dates(date::in, dep_op::in, date::in) is semidet.
|
|
|
|
apply_op_dates(D1, "=", D2) :-
|
|
get_date_date(Y1, M1, Day1, D1),
|
|
get_date_date(Y1, M1, Day1, D2).
|
|
|
|
:- instance constrainable(code) where [
|
|
pred(apply_op/3) is apply_op_codes
|
|
].
|
|
|
|
:- pred apply_op_codes(code::in, dep_op::in, code::in) is semidet.
|
|
|
|
apply_op_codes(D1, "=", D2) :-
|
|
compare((=), D1, D2).
|
|
|
|
:- instance constrainable(field(T, T2)) <=
|
|
(constrainable(T), constrainable(T2))
|
|
where [
|
|
pred(apply_op/3) is apply_op_fields
|
|
].
|
|
|
|
:- pred apply_op_fields(field(T, T2)::in, dep_op::in, field(T, T2)::in)
|
|
is semidet <= (constrainable(T), constrainable(T2)).
|
|
|
|
apply_op_fields(d(D1), Op, d(D2)) :-
|
|
apply_op(D1, Op, D2).
|
|
apply_op_fields(c(D1), Op, c(D2)) :-
|
|
apply_op(D1, Op, D2).
|