mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-16 09:53:36 +00:00
106 lines
2.4 KiB
Mathematica
106 lines
2.4 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module tu_test1.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module int.
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:- import_module list.
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:- import_module solutions.
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%---------------------------------------------------------------------------%
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main(!IO) :-
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solutions(test(1), Solns),
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io.write(Solns, !IO),
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io.nl(!IO).
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:- pred test(int::in, int::out) is nondet.
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test(X, Y) :-
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promise_pure (
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between(X, 10, Y),
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impure save_ref_on_trail(Y),
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is_correct(Y)
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).
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:- pred is_correct(int::in) is semidet.
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is_correct(5).
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is_correct(7).
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:- pred between(int::in, int::in, int::out) is multi.
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between(N, _, N).
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between(L, U, N) :-
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L < U,
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between(L + 1, U, N).
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:- impure pred save_ref_on_trail(int::in) is det.
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:- pragma foreign_proc("C",
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save_ref_on_trail(I::in),
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[will_not_call_mercury, may_modify_trail],
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"
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MR_trail_function(print_entry, (void *)I);
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").
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:- pragma foreign_decl("C", "
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#include <stdio.h>
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#include <stdlib.h>
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extern void print_entry(void *, MR_untrail_reason);
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").
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:- pragma foreign_code("C", "
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void
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print_entry(void *value, MR_untrail_reason reason)
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{
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switch (reason) {
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case MR_undo:
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printf(
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\"undo %\" MR_INTEGER_LENGTH_MODIFIER \"d\\n\",
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(MR_Integer)value);
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break;
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case MR_solve:
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printf(
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\"solve (soft commit) %\" MR_INTEGER_LENGTH_MODIFIER \"d\\n\",
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(MR_Integer)value);
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break;
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case MR_commit:
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printf(
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\"*** unexpected (hard) commit %\" MR_INTEGER_LENGTH_MODIFIER \"d\\n\",
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(MR_Integer)value);
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break;
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case MR_retry:
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printf(
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\"*** unexpected retry %\" MR_INTEGER_LENGTH_MODIFIER \"d\\n\",
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(MR_Integer)value);
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break;
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case MR_exception:
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printf(
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\"*** unexpected exception %\" MR_INTEGER_LENGTH_MODIFIER \"d\\n\",
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(MR_Integer)value);
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break;
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default:
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printf(\"*** Unexpected call to print_entry\");
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}
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}
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").
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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