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9cacd33f47
This first step deals with the consequences of such removal.
The removal itself will happen in stage 2. That step will
add "is" to the prolog module in the library.
compiler/add_pred.m:
Prepare for "is" being in the prolog module.
compiler/options.m:
Add a way to test whether the change to add_pred.m is in the
installed compiler.
tests/accumulator/base.m:
tests/accumulator/call_in_base.m:
tests/accumulator/chain.m:
tests/accumulator/commutative.m:
tests/accumulator/construct_test.m:
tests/accumulator/dcg.m:
tests/accumulator/deconstruct_test.m:
tests/accumulator/disj.m:
tests/accumulator/func.m:
tests/accumulator/heuristic.m:
tests/accumulator/highorder.m:
tests/accumulator/identity.m:
tests/accumulator/inter.m:
tests/accumulator/nonrec.m:
tests/accumulator/out_to_in.m:
tests/accumulator/qsort.m:
tests/accumulator/simple.m:
tests/accumulator/split.m:
tests/accumulator/swap.m:
tests/benchmarks/cqueens.m:
tests/benchmarks/crypt.m:
tests/benchmarks/deriv.m:
tests/benchmarks/deriv2.m:
tests/benchmarks/nrev.m:
tests/benchmarks/poly.m:
tests/benchmarks/primes.m:
tests/benchmarks/qsort.m:
tests/benchmarks/query.m:
tests/benchmarks/tak.m:
tests/debugger/interactive.m:
tests/declarative_debugger/Mercury.options:
tests/declarative_debugger/io_read_bug.m:
tests/declarative_debugger/queens.exp:
tests/declarative_debugger/queens.m:
tests/dppd/imperative_solve_impl.m:
tests/dppd/map_impl.m:
tests/dppd/max_length_impl.m:
tests/dppd/sum.m:
tests/dppd/upto_sum_impl.m:
tests/par_conj/dep_par_21.m:
tests/tabling/seq.m:
tests/term/dds3_14.m:
tests/term/mmatrix.m:
tests/term/money.m:
tests/term/occur.m:
tests/term/pl4_5_2.m:
tests/term/queens.m:
tests/typeclasses/inference_test.m:
tests/typeclasses/inference_test_2.m:
tests/valid/lazy_list.m:
tests/warnings/duplicate_const.m:
Replace calls to "is" with unifications. In many places,
bring programming style up to date.
97 lines
1.9 KiB
Mathematica
97 lines
1.9 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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:- module queens.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is cc_multi.
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:- implementation.
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:- import_module int.
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:- import_module list.
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main(!IO) :-
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data(Data),
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( if queen(Data, Out) then
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print_list(Out, !IO)
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else
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io.write_string("No solution\n", !IO)
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).
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:- pred data(list(int)::out) is det.
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data([1, 2, 3, 4, 5]).
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:- pred queen(list(int)::in, list(int)::out) is nondet.
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queen(Data, Out) :-
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qperm(Data, Out),
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safe(Out).
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:- pred qperm(list(T)::in, list(T)::out) is nondet.
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qperm([], []).
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qperm([X | K], K) :-
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qdelete(U, [X | K], Z),
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K = [U | V],
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qperm(Z, V).
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:- pred qdelete(T::out, list(T)::in, list(T)::out) is nondet.
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qdelete(A, [A | L], L).
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qdelete(X, [A | Z], [A | R]) :-
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qdelete(X, Z, R).
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:- pred safe(list(int)::in) is semidet.
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safe([]).
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safe([N | L]) :-
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nodiag(N, 1, L),
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safe(L).
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:- pred nodiag(int::in, int::in, list(int)::in) is semidet.
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nodiag(_, _, []).
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nodiag(B, D, [N | L]) :-
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NmB = N - B,
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BmN = B - N,
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( if D = NmB then
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fail
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else if D = BmN then
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fail
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else
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true
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),
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D1 = D + 1,
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nodiag(B, D1, L).
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:- pred print_list(list(int)::in, io::di, io::uo) is det.
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print_list(Xs, !IO) :-
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(
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Xs = [],
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io.write_string("[]\n", !IO)
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;
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Xs = [H | T],
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io.write_string("[", !IO),
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print_list_elements(H, T, !IO),
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io.write_string("]\n", !IO)
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).
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:- pred print_list_elements(int::in, list(int)::in, io::di, io::uo) is det.
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print_list_elements(X, Xs, !IO) :-
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io.write_int(X, !IO),
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(
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Xs = []
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;
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Xs = [H | T],
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io.write_string(", ", !IO),
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print_list_elements(H, T, !IO)
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).
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