mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-15 17:33:38 +00:00
1db00c99aa
library/list.m:
Add the above predicates to the list module.
NEWS:
Announce the new predicates.
tests/hard_coded/fold_tests.{m,exp}:
Test case for the new functionality.
tests/hard_coded/Mmakefile:
Enable the new test case.
46 lines
1.3 KiB
Mathematica
46 lines
1.3 KiB
Mathematica
%---------------------------------------------------------------------------%
|
|
% vim: ts=4 sw=4 et ft=mercury
|
|
%---------------------------------------------------------------------------%
|
|
|
|
:- module fold_tests.
|
|
:- interface.
|
|
|
|
:- import_module io.
|
|
|
|
:- pred main(io::di, io::uo) is det.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
:- implementation.
|
|
|
|
:- import_module list.
|
|
:- import_module string.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
main(!IO) :-
|
|
TestList = 1 .. 10,
|
|
test_write(TestList, !IO),
|
|
list.foldl(prepend_int_to_string, TestList, "", Str0),
|
|
list.chunk_foldl(3, prepend_int_to_string, TestList, "", Str1),
|
|
io.format("using foldl: %s\n", [s(Str0)], !IO),
|
|
io.format("using chunk_foldl: %s\n", [s(Str1)], !IO).
|
|
|
|
:- pred prepend_int_to_string(int::in, string::in, string::out) is det.
|
|
|
|
prepend_int_to_string(N, !Str) :-
|
|
( if !.Str = "" then
|
|
!:Str = string.int_to_string(N)
|
|
else
|
|
!:Str = string.int_to_string(N) ++ "_" ++ !.Str
|
|
).
|
|
|
|
:- pred test_write(list(int)::in, io::di, io::uo) is det.
|
|
|
|
test_write(TestList, !IO) :-
|
|
list.gap_foldl(io.write_int, io.write_string(", "), TestList, !IO),
|
|
io.nl(!IO),
|
|
list.last_gap_foldl(io.write_int, io.write_string(", "),
|
|
io.write_string(" and "), TestList, !IO),
|
|
io.nl(!IO).
|