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Add non-parameterised version of HList fold

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This commit is contained in:
George Thomas 2026-01-04 02:57:38 +00:00
parent 2180af71ad
commit 234640fb1a
2 changed files with 6 additions and 1 deletions
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2
haskell/Main.hs
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@ -41,7 +41,7 @@ main =
describe pt do
input <- liftIO $ parseFile $ "../inputs/" <> t <> "/" <> pt
let (rs, os) =
((getConst . foldHListF (\x r -> Const $ fst x : getConst r) (Const [])) &&& foldHListF (HCons . snd) HNil) $
(foldHListF0 ((:) . fst) [] &&& foldHListF (HCons . snd) HNil) $
mapHListF (\(Fanout (f, Op o)) -> (o &&& id) $ f input) parts
for_ (zip [1 :: Int ..] rs) $ uncurry $ \(show -> n) ->
it n . pureGoldenTextFile ("../outputs/" <> t <> "/" <> pt <> "/" <> n) . (<> "\n")

5
haskell/Pre.hs
View File

@ -43,6 +43,7 @@ module Pre (
sortPair,
HListF (..),
foldHListF,
foldHListF0,
mapHListF,
(/\),
(/\\),
@ -150,6 +151,10 @@ foldHListF :: (forall x xs. f x -> r xs -> r (x ': xs)) -> r '[] -> HListF f as
foldHListF f e = \case
HNilF -> e
HConsF x xs -> f x $ foldHListF f e xs
foldHListF0 :: (forall x. f x -> r -> r) -> r -> HListF f as -> r
foldHListF0 f e = \case
HNilF -> e
HConsF x xs -> f x $ foldHListF0 f e xs
mapHListF :: (forall a. f a -> g a) -> HListF f as -> HListF g as
mapHListF t = foldHListF (\x r -> HConsF (t x) $ r) HNilF