comonad-transformers-1.7: Comonad transformers

Portabilityportable
Stabilityprovisional
MaintainerEdward Kmett <ekmett@gmail.com>

Control.Comonad.Trans.Cofree

Description

Haskell 98 cofree comonads

Synopsis

Documentation

data Cofree f a Source

Constructors

a :< (f (Cofree f a)) 

Instances

ComonadTrans Cofree 
Functor f => Functor (Cofree f) 
Applicative f => Applicative (Cofree f) 
Foldable f => Foldable (Cofree f) 
Traversable f => Traversable (Cofree f) 
Functor f => Comonad (Cofree f) 
Functor f => Extend (Cofree f) 
Distributive f => Distributive (Cofree f) 
Traversable1 f => Traversable1 (Cofree f) 
Foldable1 f => Foldable1 (Cofree f) 
Apply f => Apply (Cofree f) 
(Eq (f (Cofree f a)), Eq a) => Eq (Cofree f a) 
(Ord (f (Cofree f a)), Ord a) => Ord (Cofree f a) 
(Read (f (Cofree f a)), Read a) => Read (Cofree f a) 
(Show (f (Cofree f a)), Show a) => Show (Cofree f a) 

section :: Comonad f => f a -> Cofree f aSource

lower . section = id

unwrap :: Cofree f a -> f (Cofree f a)Source

coiter :: Functor f => (a -> f a) -> a -> Cofree f aSource

unfold :: Functor f => (b -> (a, f b)) -> b -> Cofree f aSource