| Portability | non-portable (fundeps, MPTCs) |
|---|---|
| Stability | experimental |
| Maintainer | Edward Kmett <ekmett@gmail.com> |
| Safe Haskell | Trustworthy |
Control.Comonad.Store
Description
- class Comonad w => ComonadStore s w | w -> s where
- type Store s = StoreT s Identity
- store :: (s -> a) -> s -> Store s a
- runStore :: Store s a -> (s -> a, s)
- data StoreT s w a = StoreT (w (s -> a)) s
- runStoreT :: StoreT s w a -> (w (s -> a), s)
- module Control.Comonad
- module Control.Comonad.Trans.Class
ComonadStore class
class Comonad w => ComonadStore s w | w -> s whereSource
Methods
peeks :: (s -> s) -> w a -> aSource
seeks :: (s -> s) -> w a -> w aSource
experiment :: Functor f => (s -> f s) -> w a -> f aSource
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) |
The Store comonad
store :: (s -> a) -> s -> Store s aSource
Create a Store using an accessor function and a stored value
The StoreT comonad transformer
Constructors
| StoreT (w (s -> a)) s |
Instances
| ComonadEnv e w => ComonadEnv e (StoreT t w) | |
| Comonad w => ComonadStore s (StoreT s w) | |
| ComonadTraced m w => ComonadTraced m (StoreT s w) | |
| ComonadTrans (StoreT s) | |
| ComonadHoist (StoreT s) | |
| Functor w => Functor (StoreT s w) | |
| (Typeable s, Typeable1 w) => Typeable1 (StoreT s w) | |
| (Applicative w, Monoid s) => Applicative (StoreT s w) | |
| (ComonadApply w, Semigroup s) => ComonadApply (StoreT s w) | |
| Comonad w => Comonad (StoreT s w) | |
| (Typeable s, Typeable1 w, Typeable a) => Typeable (StoreT s w a) |
Re-exported modules
module Control.Comonad
module Control.Comonad.Trans.Class