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81 lines
1.5 KiB
Mathematica
81 lines
1.5 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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%
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% Tests all 3 types of transitive closure.
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:- module tc_minimal2.
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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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:- implementation.
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:- import_module list.
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:- import_module solutions.
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:- pragma require_feature_set([memo]).
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main(!IO) :-
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solutions(tc_l(1), SolnsL),
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io.write_string("L = ", !IO),
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io.write(SolnsL, !IO),
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io.write_string("\n", !IO),
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solutions(tc_r(1), SolnsR),
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io.write_string("R = ", !IO),
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io.write(SolnsR, !IO),
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io.write_string("\n", !IO),
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solutions(tc_d(1), SolnsD),
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io.write_string("D = ", !IO),
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io.write(SolnsD, !IO),
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io.write_string("\n", !IO).
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:- pred tc_l(int::in, int::out) is nondet.
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:- pragma minimal_model(tc_l/2).
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tc_l(A, B) :-
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(
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edge(A, B)
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;
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tc_l(A, C), edge(C, B)
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).
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:- pred tc_r(int::in, int::out) is nondet.
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:- pragma minimal_model(tc_r/2).
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tc_r(A, B) :-
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edge(A, C),
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(
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B = C
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;
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tc_r(C, B)
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).
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:- pred tc_d(int::in, int::out) is nondet.
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:- pragma minimal_model(tc_d/2).
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tc_d(A, B) :-
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(
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edge(A, B)
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;
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tc_d(A, C), tc_d(C, B)
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).
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:- pred edge(int::in, int::out) is nondet.
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edge(1, 2).
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edge(1, 7).
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edge(7, 8).
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edge(8, 7).
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edge(8, 9).
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edge(8, 10).
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edge(2, 3).
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edge(3, 4).
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edge(4, 5).
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edge(4, 1).
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edge(5, 1).
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edge(1, 1).
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