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{-# LANGUAGE TypeFamilies, TypeOperators, RankNTypes #-}
module HO where
import Data.IORef
type family SMRef (m::(* -> *)) :: * -> *
type family SMMonad (r::(* -> *)) :: * -> *
type instance SMRef IO = IORef
type instance SMMonad IORef = IO
class SMMonad (SMRef m) ~ m => SM m where
new :: forall a. a -> m (SMRef m a)
read :: forall a. (SMRef m a) -> m a
write :: forall a. (SMRef m a) -> a -> m ()
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