monad-skeleton
Monads of program skeleta
https://github.com/fumieval/monad-skeleton
| Version on this page: | 0.1.5 |
| LTS Haskell 20.26: | 0.2 |
| Stackage Nightly 2022-11-17: | 0.2 |
| Latest on Hackage: | 0.2 |
Maintained by Fumiaki Kinoshita
This version can be pinned in stack with:
monad-skeleton-0.1.5@sha256:fc2aba2fc8b712e32649b7a5fb287931fe5cf47c03e75e4881d7509991814b2a,1059Module documentation for 0.1.5
- Control
Depends on 1 package(full list with versions):
Used by 2 packages in lts-12.14(full list with versions):
monad-skeleton
This package provides Skeleton, an operational monad. The internal encoding
gives O(1) bind and monadic reflection.
Skeleton promotes unit instructions to a monad. It is isomorphic to
MonadView (Skeleton t):
data MonadView t m x where
Return :: a -> MonadView t m a
(:>>=) :: !(t a) -> (a -> m b) -> MonadView t m b
boned :: MonadView t (Skeleton t) a -> Skeleton t a
debone :: Skeleton t a -> MonadView t (Skeleton t) a
GADTs are handy to define instructions:
data Interaction x where
Get :: Interaction String
Put :: String -> Interaction ()
echo :: Skeleton Interaction ()
echo = bone Get >>= bone . Put
Use debone to interpret a computation.
interpret :: Skeleton Interaction a -> IO a
interpret m = case debone m of
Return a -> return a
Get :>>= k -> getLine >>= interpret . k
Put s :>>= k -> putStrLn s >>= interpret . k