Control.Comonad.Store.Class

Documentation

class Comonad w => ComonadStore s w | w -> s where

Methods

pos :: w a -> s

peek :: s -> w a -> a

peeks :: (s -> s) -> w a -> a

seek :: s -> w a -> w a

seeks :: (s -> s) -> w a -> w a

experiment :: Functor f => (s -> f s) -> w a -> f a

Instances

ComonadStore s w => ComonadStore s (IdentityT w)

(ComonadStore s w, Monoid m) => ComonadStore s (TracedT m w)

ComonadStore s w => ComonadStore s (EnvT e w)

Comonad w => ComonadStore s (StoreT s w)

lowerPos :: (ComonadTrans t, ComonadStore s w) => t w a -> s

lowerPeek :: (ComonadTrans t, ComonadStore s w) => s -> t w a -> a