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samples/java_interface/java_calls_mercury/*.m:
Use spaces instead of tabs.
Delete trailing whitespace.
Fix a cut-and-paste error where exports to C instead of
Java are referred to.
samples/java_interface/mercury_calls_java/Makefile:
Fix the compilation options for this example.
samples/java_interface/mercury_calls_java/mercury_main.m:
Fix formatting.
73 lines
2.2 KiB
Mathematica
73 lines
2.2 KiB
Mathematica
% This source file is hereby placed in the public domain. -fjh (the author).
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%-----------------------------------------------------------------------------%
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:- module mercury_lib.
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:- interface.
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% A Mercury predicate with multiple modes.
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%
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:- pred foo(int).
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:- mode foo(in) is semidet.
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:- mode foo(out) is multi.
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% A Mercury function with multiple modes.
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%
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:- func bar(int) = int.
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:- mode bar(in) = out is det.
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:- mode bar(out) = in is det.
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:- mode bar(in) = in is semidet.
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% A semidet (i.e. partial) Mercury function.
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:- func baz(int) = int.
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:- mode baz(in) = out is semidet.
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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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% well, this is just a silly example...
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foo(42).
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foo(53).
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foo(197).
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bar(X) = X + 1.
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baz(1) = 9.
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baz(2) = 16.
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baz(3) = 27.
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%-----------------------------------------------------------------------------%
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% The following code provides provides access to the Mercury predicate foo
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% from Java code.
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:- pragma foreign_export("Java", foo(in), "foo_test").
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:- pragma foreign_export("Java", bar(in) = out, "bar").
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:- pragma foreign_export("Java", bar(in) = in, "bar_test").
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:- pragma foreign_export("Java", bar(out) = in, "bar_inverse").
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:- pragma foreign_export("Java", baz(in) = out, "baz").
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% The nondet mode of `foo' cannot be exported directly with the
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% Mercury/Java interface. To get all solutions, must define a predicate
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% which returns all the solutions of foo, and export it to Java. We give
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% it the name foo_list() in Java.
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:- pred all_foos(list(int)::out) is det.
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:- pragma foreign_export("Java", all_foos(out), "foo_list").
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all_foos(L) :- solutions((pred(X::out) is multi :- foo(X)), L).
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% If we just want one solution, and don't care which one, then we can
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% export a `cc_multi' (committed-choice nondeterminism) version of `foo'.
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% We give it the name one_foo().
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:- pred cc_foo(int::out) is cc_multi.
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:- pragma foreign_export("Java", cc_foo(out), "one_foo").
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cc_foo(X) :- foo(X).
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%-----------------------------------------------------------------------------%
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