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Haskell pipeline
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{-# LANGUAGE GADTs #-} | |
import Data.Char (digitToInt) | |
data Nil | |
data Cons a b | |
data Pipeline ts a c where | |
(:>) :: (a -> b) -> Pipeline ts b c -> Pipeline (Cons (a -> b) ts) a c | |
Id :: Pipeline Nil t t | |
infixr 9 :> | |
pHead :: Pipeline (Cons (a -> b) fs) a c -> (a -> b) | |
pHead (f :> _) = f | |
pTail :: Pipeline (Cons (a -> b) fs) a c -> Pipeline fs b c | |
pTail (_ :> fs) = fs | |
testP = digitToInt :> (+ 1) :> show :> Id |
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