Files
mercury/tests/purity/impure_func_t5_fixed2.m
Zoltan Somogyi ecb5e4a9e6 Update the style of many test cases.
tests/declarative_debugger/*.m:
tests/exceptions/*.m:
tests/general/*.m:
tests/grade_subdirs/*.m:
tests/purity/*.m:
tests/submodules/*.m:
tests/typeclasses/*.m:
    Update programming style.

tests/declarative_debugger/*.inp:
    Update line numbers in breakpoint commands.
tests/declarative_debugger/*.exp:
    Update expected line numbers.

tests/exceptions/Mercury.options:
tests/general/Mercury.options:
    Disable some warnings that are irrelevant to the test.
2021-07-25 23:26:17 +10:00

45 lines
1015 B
Mathematica

%---------------------------------------------------------------------------%
% vim: ts=4 sw=4 et ft=mercury
%---------------------------------------------------------------------------%
:- module impure_func_t5_fixed2.
:- interface.
:- import_module io.
:- pred main(io::di, io::uo) is det.
:- implementation.
:- import_module int.
:- import_module list.
:- import_module require.
:- type foo
---> foo(impure func(int) = int).
:- pragma promise_pure(main/2).
main(!IO) :-
X = get_counter,
io.print("X(4) = ", !IO),
impure X4 = impure_apply(X, 4),
io.print_line(X4, !IO),
io.print("X(4) = ", !IO),
impure X4b = impure_apply(X, 4),
io.print_line(X4b, !IO).
:- pragma foreign_decl("C", "extern MR_Integer counter;").
:- pragma foreign_code("C", "MR_Integer counter = 42;").
:- impure func get_counter(int) = int is det.
get_counter(X) = X.
:- pragma foreign_proc("C",
get_counter(Y::in) = (X::out),
[will_not_call_mercury],
"
X = counter + Y; counter++;
").