Copyright	(C) 2008-2014 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	experimental
Portability	non-portable (fundeps, MPTCs)
Safe Haskell	Safe
Language	Haskell2010

Control.Comonad.Store

Contents

Description

Synopsis

ComonadStore class

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

Minimal complete definition

Methods

pos :: w a -> s Source

peek :: s -> w a -> a Source

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

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

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

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

Instances

ComonadStore s w => ComonadStore s (IdentityT w) Source
(ComonadStore s w, Monoid m) => ComonadStore s (TracedT m w) Source
ComonadStore s w => ComonadStore s (EnvT e w) Source
Comonad w => ComonadStore s (StoreT s w) Source

The Store comonad

store :: (s -> a) -> s -> Store s a Source

Create a Store using an accessor function and a stored value

runStore :: Store s a -> (s -> a, s) Source

Constructors

StoreT (w (s -> a)) s

Instances

ComonadEnv e w => ComonadEnv e (StoreT t w) Source
Comonad w => ComonadStore s (StoreT s w) Source
ComonadTraced m w => ComonadTraced m (StoreT s w) Source
ComonadTrans (StoreT s) Source
ComonadHoist (StoreT s) Source
Functor w => Functor (StoreT s w) Source
(Applicative w, Monoid s) => Applicative (StoreT s w) Source
(ComonadApply w, Semigroup s) => ComonadApply (StoreT s w) Source
Comonad w => Comonad (StoreT s w) Source

runStoreT :: StoreT s w a -> (w (s -> a), s) Source