Copyright	(C) 2008-2013 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	MPTCs, fundeps
Safe Haskell	Safe
Language	Haskell2010

Control.Comonad.Trans.Cofree

Description

The cofree comonad transformer

Synopsis

newtype CofreeT (f :: Type -> Type) (w :: Type -> Type) a = CofreeT {
- runCofreeT :: w (CofreeF f a (CofreeT f w a))
}
type Cofree (f :: Type -> Type) = CofreeT f Identity
cofree :: forall (f :: Type -> Type) a. CofreeF f a (Cofree f a) -> Cofree f a
runCofree :: forall (f :: Type -> Type) a. Cofree f a -> CofreeF f a (Cofree f a)
data CofreeF (f :: Type -> Type) a b = a :< (f b)
class (Functor f, Comonad w) => ComonadCofree (f :: Type -> Type) (w :: Type -> Type) | w -> f where
- unwrap :: w a -> f (w a)
headF :: forall (f :: Type -> Type) a b. CofreeF f a b -> a
tailF :: CofreeF f a b -> f b
transCofreeT :: forall g (w :: Type -> Type) f a. (Functor g, Comonad w) => (forall x. f x -> g x) -> CofreeT f w a -> CofreeT g w a
coiterT :: (Functor f, Comonad w) => (w a -> f (w a)) -> w a -> CofreeT f w a

Documentation

newtype CofreeT (f :: Type -> Type) (w :: Type -> Type) a Source #

This is a cofree comonad of some functor f, with a comonad w threaded through it at each level.

Constructors

CofreeT
Fields runCofreeT :: w (CofreeF f a (CofreeT f w a))

Instances

Instances details

(Functor f, ComonadEnv e w) => ComonadEnv e (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods ask :: CofreeT f w a -> e Source #
(Functor f, Comonad w) => ComonadCofree f (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods unwrap :: CofreeT f w a -> f (CofreeT f w a) Source #
Functor f => ComonadHoist (CofreeT f) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods cohoist :: (Comonad w, Comonad v) => (forall x. w x -> v x) -> CofreeT f w a -> CofreeT f v a Source #
ComonadTrans (CofreeT f) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods lower :: Comonad w => CofreeT f w a -> w a Source #
Alternative f => MonadTrans (CofreeT f) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods lift :: Monad m => m a -> CofreeT f m a Source #
(Alternative f, MonadZip f, MonadZip m) => MonadZip (CofreeT f m) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods mzip :: CofreeT f m a -> CofreeT f m b -> CofreeT f m (a, b) Source # mzipWith :: (a -> b -> c) -> CofreeT f m a -> CofreeT f m b -> CofreeT f m c Source # munzip :: CofreeT f m (a, b) -> (CofreeT f m a, CofreeT f m b) Source #
(Functor f, Comonad w) => Comonad (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods extract :: CofreeT f w a -> a Source # duplicate :: CofreeT f w a -> CofreeT f w (CofreeT f w a) Source # extend :: (CofreeT f w a -> b) -> CofreeT f w a -> CofreeT f w b Source #
(Alternative f, Applicative w) => Applicative (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods pure :: a -> CofreeT f w a Source # (<>) :: CofreeT f w (a -> b) -> CofreeT f w a -> CofreeT f w b Source # liftA2 :: (a -> b -> c) -> CofreeT f w a -> CofreeT f w b -> CofreeT f w c Source # (>) :: CofreeT f w a -> CofreeT f w b -> CofreeT f w b Source # (<*) :: CofreeT f w a -> CofreeT f w b -> CofreeT f w a Source #
(Functor f, Functor w) => Functor (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods fmap :: (a -> b) -> CofreeT f w a -> CofreeT f w b Source # (<$) :: a -> CofreeT f w b -> CofreeT f w a Source #
(Alternative f, Monad w) => Monad (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods (>>=) :: CofreeT f w a -> (a -> CofreeT f w b) -> CofreeT f w b Source # (>>) :: CofreeT f w a -> CofreeT f w b -> CofreeT f w b Source # return :: a -> CofreeT f w a Source #
(Foldable f, Foldable w) => Foldable (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods fold :: Monoid m => CofreeT f w m -> m Source # foldMap :: Monoid m => (a -> m) -> CofreeT f w a -> m Source # foldMap' :: Monoid m => (a -> m) -> CofreeT f w a -> m Source # foldr :: (a -> b -> b) -> b -> CofreeT f w a -> b Source # foldr' :: (a -> b -> b) -> b -> CofreeT f w a -> b Source # foldl :: (b -> a -> b) -> b -> CofreeT f w a -> b Source # foldl' :: (b -> a -> b) -> b -> CofreeT f w a -> b Source # foldr1 :: (a -> a -> a) -> CofreeT f w a -> a Source # foldl1 :: (a -> a -> a) -> CofreeT f w a -> a Source # toList :: CofreeT f w a -> [a] Source # null :: CofreeT f w a -> Bool Source # length :: CofreeT f w a -> Int Source # elem :: Eq a => a -> CofreeT f w a -> Bool Source # maximum :: Ord a => CofreeT f w a -> a Source # minimum :: Ord a => CofreeT f w a -> a Source # sum :: Num a => CofreeT f w a -> a Source # product :: Num a => CofreeT f w a -> a Source #
(Traversable f, Traversable w) => Traversable (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods traverse :: Applicative f0 => (a -> f0 b) -> CofreeT f w a -> f0 (CofreeT f w b) Source # sequenceA :: Applicative f0 => CofreeT f w (f0 a) -> f0 (CofreeT f w a) Source # mapM :: Monad m => (a -> m b) -> CofreeT f w a -> m (CofreeT f w b) Source # sequence :: Monad m => CofreeT f w (m a) -> m (CofreeT f w a) Source #
(Typeable f, Typeable w, Data (w (CofreeF f a (CofreeT f w a))), Data a) => Data (CofreeT f w a) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CofreeT f w a -> c (CofreeT f w a) Source # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (CofreeT f w a) Source # toConstr :: CofreeT f w a -> Constr Source # dataTypeOf :: CofreeT f w a -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (CofreeT f w a)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (CofreeT f w a)) Source # gmapT :: (forall b. Data b => b -> b) -> CofreeT f w a -> CofreeT f w a Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CofreeT f w a -> r Source # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CofreeT f w a -> r Source # gmapQ :: (forall d. Data d => d -> u) -> CofreeT f w a -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> CofreeT f w a -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> CofreeT f w a -> m (CofreeT f w a) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CofreeT f w a -> m (CofreeT f w a) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CofreeT f w a -> m (CofreeT f w a) Source #
Read (w (CofreeF f a (CofreeT f w a))) => Read (CofreeT f w a) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods readsPrec :: Int -> ReadS (CofreeT f w a) Source # readList :: ReadS [CofreeT f w a] Source # readPrec :: ReadPrec (CofreeT f w a) Source # readListPrec :: ReadPrec [CofreeT f w a] Source #
Show (w (CofreeF f a (CofreeT f w a))) => Show (CofreeT f w a) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods showsPrec :: Int -> CofreeT f w a -> ShowS Source # show :: CofreeT f w a -> String Source # showList :: [CofreeT f w a] -> ShowS Source #
Eq (w (CofreeF f a (CofreeT f w a))) => Eq (CofreeT f w a) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods (==) :: CofreeT f w a -> CofreeT f w a -> Bool Source # (/=) :: CofreeT f w a -> CofreeT f w a -> Bool Source #
Ord (w (CofreeF f a (CofreeT f w a))) => Ord (CofreeT f w a) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods compare :: CofreeT f w a -> CofreeT f w a -> Ordering Source # (<) :: CofreeT f w a -> CofreeT f w a -> Bool Source # (<=) :: CofreeT f w a -> CofreeT f w a -> Bool Source # (>) :: CofreeT f w a -> CofreeT f w a -> Bool Source # (>=) :: CofreeT f w a -> CofreeT f w a -> Bool Source # max :: CofreeT f w a -> CofreeT f w a -> CofreeT f w a Source # min :: CofreeT f w a -> CofreeT f w a -> CofreeT f w a Source #

type Cofree (f :: Type -> Type) = CofreeT f Identity Source #

The cofree Comonad of a functor f.

cofree :: forall (f :: Type -> Type) a. CofreeF f a (Cofree f a) -> Cofree f a Source #

Wrap another layer around a cofree comonad value.

cofree is a right inverse of runCofree.

runCofree . cofree == id

runCofree :: forall (f :: Type -> Type) a. Cofree f a -> CofreeF f a (Cofree f a) Source #

Unpeel the first layer off a cofree comonad value.

runCofree is a right inverse of cofree.

cofree . runCofree == id

data CofreeF (f :: Type -> Type) a b Source #

This is the base functor of the cofree comonad transformer.

Constructors

a :< (f b) infixr 5

Instances

Instances details

Generic1 (CofreeF f a :: Type -> Type) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Associated Types

type Rep1 (CofreeF f a :: Type -> Type)

Instance details

Defined in Control.Comonad.Trans.Cofree

type Rep1 (CofreeF f a :: Type -> Type) = D1 ('MetaData "CofreeF" "Control.Comonad.Trans.Cofree" "free-5.2-Jw8xrnkTvQxJixTB1R2SFq" 'False) (C1 ('MetaCons ":<" ('InfixI 'RightAssociative 5) 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec1 f)))

Methods

from1 :: CofreeF f a a0 -> Rep1 (CofreeF f a) a0 Source #

to1 :: Rep1 (CofreeF f a) a0 -> CofreeF f a a0 Source #

Foldable f => Bifoldable (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

bifold :: Monoid m => CofreeF f m m -> m Source #

bifoldMap :: Monoid m => (a -> m) -> (b -> m) -> CofreeF f a b -> m Source #

bifoldr :: (a -> c -> c) -> (b -> c -> c) -> c -> CofreeF f a b -> c Source #

bifoldl :: (c -> a -> c) -> (c -> b -> c) -> c -> CofreeF f a b -> c Source #

Functor f => Bifunctor (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

bimap :: (a -> b) -> (c -> d) -> CofreeF f a c -> CofreeF f b d Source #

first :: (a -> b) -> CofreeF f a c -> CofreeF f b c Source #

second :: (b -> c) -> CofreeF f a b -> CofreeF f a c Source #

Traversable f => Bitraversable (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

bitraverse :: Applicative f0 => (a -> f0 c) -> (b -> f0 d) -> CofreeF f a b -> f0 (CofreeF f c d) Source #

Eq1 f => Eq2 (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftEq2 :: (a -> b -> Bool) -> (c -> d -> Bool) -> CofreeF f a c -> CofreeF f b d -> Bool Source #

Ord1 f => Ord2 (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftCompare2 :: (a -> b -> Ordering) -> (c -> d -> Ordering) -> CofreeF f a c -> CofreeF f b d -> Ordering Source #

Read1 f => Read2 (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (CofreeF f a b) Source #

liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> (Int -> ReadS b) -> ReadS [b] -> ReadS [CofreeF f a b] Source #

liftReadPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec (CofreeF f a b) Source #

liftReadListPrec2 :: ReadPrec a -> ReadPrec [a] -> ReadPrec b -> ReadPrec [b] -> ReadPrec [CofreeF f a b] Source #

Show1 f => Show2 (CofreeF f) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftShowsPrec2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> Int -> CofreeF f a b -> ShowS Source #

liftShowList2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> (Int -> b -> ShowS) -> ([b] -> ShowS) -> [CofreeF f a b] -> ShowS Source #

(Eq1 f, Eq a) => Eq1 (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftEq :: (a0 -> b -> Bool) -> CofreeF f a a0 -> CofreeF f a b -> Bool Source #

(Ord1 f, Ord a) => Ord1 (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftCompare :: (a0 -> b -> Ordering) -> CofreeF f a a0 -> CofreeF f a b -> Ordering Source #

(Read1 f, Read a) => Read1 (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftReadsPrec :: (Int -> ReadS a0) -> ReadS [a0] -> Int -> ReadS (CofreeF f a a0) Source #

liftReadList :: (Int -> ReadS a0) -> ReadS [a0] -> ReadS [CofreeF f a a0] Source #

liftReadPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec (CofreeF f a a0) Source #

liftReadListPrec :: ReadPrec a0 -> ReadPrec [a0] -> ReadPrec [CofreeF f a a0] Source #

(Show1 f, Show a) => Show1 (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

liftShowsPrec :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> Int -> CofreeF f a a0 -> ShowS Source #

liftShowList :: (Int -> a0 -> ShowS) -> ([a0] -> ShowS) -> [CofreeF f a a0] -> ShowS Source #

Functor f => Functor (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

fmap :: (a0 -> b) -> CofreeF f a a0 -> CofreeF f a b Source #

(<$) :: a0 -> CofreeF f a b -> CofreeF f a a0 Source #

Foldable f => Foldable (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

fold :: Monoid m => CofreeF f a m -> m Source #

foldMap :: Monoid m => (a0 -> m) -> CofreeF f a a0 -> m Source #

foldMap' :: Monoid m => (a0 -> m) -> CofreeF f a a0 -> m Source #

foldr :: (a0 -> b -> b) -> b -> CofreeF f a a0 -> b Source #

foldr' :: (a0 -> b -> b) -> b -> CofreeF f a a0 -> b Source #

foldl :: (b -> a0 -> b) -> b -> CofreeF f a a0 -> b Source #

foldl' :: (b -> a0 -> b) -> b -> CofreeF f a a0 -> b Source #

foldr1 :: (a0 -> a0 -> a0) -> CofreeF f a a0 -> a0 Source #

foldl1 :: (a0 -> a0 -> a0) -> CofreeF f a a0 -> a0 Source #

toList :: CofreeF f a a0 -> [a0] Source #

null :: CofreeF f a a0 -> Bool Source #

length :: CofreeF f a a0 -> Int Source #

elem :: Eq a0 => a0 -> CofreeF f a a0 -> Bool Source #

maximum :: Ord a0 => CofreeF f a a0 -> a0 Source #

minimum :: Ord a0 => CofreeF f a a0 -> a0 Source #

sum :: Num a0 => CofreeF f a a0 -> a0 Source #

product :: Num a0 => CofreeF f a a0 -> a0 Source #

Traversable f => Traversable (CofreeF f a) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

traverse :: Applicative f0 => (a0 -> f0 b) -> CofreeF f a a0 -> f0 (CofreeF f a b) Source #

sequenceA :: Applicative f0 => CofreeF f a (f0 a0) -> f0 (CofreeF f a a0) Source #

mapM :: Monad m => (a0 -> m b) -> CofreeF f a a0 -> m (CofreeF f a b) Source #

sequence :: Monad m => CofreeF f a (m a0) -> m (CofreeF f a a0) Source #

(Typeable f, Data a, Data (f b), Data b) => Data (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> CofreeF f a b -> c (CofreeF f a b) Source #

gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (CofreeF f a b) Source #

toConstr :: CofreeF f a b -> Constr Source #

dataTypeOf :: CofreeF f a b -> DataType Source #

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (CofreeF f a b)) Source #

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (CofreeF f a b)) Source #

gmapT :: (forall b0. Data b0 => b0 -> b0) -> CofreeF f a b -> CofreeF f a b Source #

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CofreeF f a b -> r Source #

gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CofreeF f a b -> r Source #

gmapQ :: (forall d. Data d => d -> u) -> CofreeF f a b -> [u] Source #

gmapQi :: Int -> (forall d. Data d => d -> u) -> CofreeF f a b -> u Source #

gmapM :: Monad m => (forall d. Data d => d -> m d) -> CofreeF f a b -> m (CofreeF f a b) Source #

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CofreeF f a b -> m (CofreeF f a b) Source #

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CofreeF f a b -> m (CofreeF f a b) Source #

Generic (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Associated Types

type Rep (CofreeF f a b)

Instance details

Defined in Control.Comonad.Trans.Cofree

type Rep (CofreeF f a b) = D1 ('MetaData "CofreeF" "Control.Comonad.Trans.Cofree" "free-5.2-Jw8xrnkTvQxJixTB1R2SFq" 'False) (C1 ('MetaCons ":<" ('InfixI 'RightAssociative 5) 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (f b))))

Methods

from :: CofreeF f a b -> Rep (CofreeF f a b) x Source #

to :: Rep (CofreeF f a b) x -> CofreeF f a b Source #

(Read a, Read (f b)) => Read (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

readsPrec :: Int -> ReadS (CofreeF f a b) Source #

readList :: ReadS [CofreeF f a b] Source #

readPrec :: ReadPrec (CofreeF f a b) Source #

readListPrec :: ReadPrec [CofreeF f a b] Source #

(Show a, Show (f b)) => Show (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

showsPrec :: Int -> CofreeF f a b -> ShowS Source #

show :: CofreeF f a b -> String Source #

showList :: [CofreeF f a b] -> ShowS Source #

(Eq a, Eq (f b)) => Eq (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

(==) :: CofreeF f a b -> CofreeF f a b -> Bool Source #

(/=) :: CofreeF f a b -> CofreeF f a b -> Bool Source #

(Ord a, Ord (f b)) => Ord (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

Methods

compare :: CofreeF f a b -> CofreeF f a b -> Ordering Source #

(<) :: CofreeF f a b -> CofreeF f a b -> Bool Source #

(<=) :: CofreeF f a b -> CofreeF f a b -> Bool Source #

(>) :: CofreeF f a b -> CofreeF f a b -> Bool Source #

(>=) :: CofreeF f a b -> CofreeF f a b -> Bool Source #

max :: CofreeF f a b -> CofreeF f a b -> CofreeF f a b Source #

min :: CofreeF f a b -> CofreeF f a b -> CofreeF f a b Source #

type Rep1 (CofreeF f a :: Type -> Type) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

type Rep1 (CofreeF f a :: Type -> Type) = D1 ('MetaData "CofreeF" "Control.Comonad.Trans.Cofree" "free-5.2-Jw8xrnkTvQxJixTB1R2SFq" 'False) (C1 ('MetaCons ":<" ('InfixI 'RightAssociative 5) 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec1 f)))

type Rep (CofreeF f a b) Source #

Instance details

Defined in Control.Comonad.Trans.Cofree

type Rep (CofreeF f a b) = D1 ('MetaData "CofreeF" "Control.Comonad.Trans.Cofree" "free-5.2-Jw8xrnkTvQxJixTB1R2SFq" 'False) (C1 ('MetaCons ":<" ('InfixI 'RightAssociative 5) 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (f b))))

class (Functor f, Comonad w) => ComonadCofree (f :: Type -> Type) (w :: Type -> Type) | w -> f where Source #

Allows you to peel a layer off a cofree comonad.

Methods

unwrap :: w a -> f (w a) Source #

Remove a layer.

Instances

Instances details

ComonadCofree Maybe NonEmpty Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: NonEmpty a -> Maybe (NonEmpty a) Source #
ComonadCofree [] Tree Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: Tree a -> [Tree a] Source #
Comonad w => ComonadCofree Identity (CoiterT w) Source #
Instance details Defined in Control.Comonad.Trans.Coiter Methods unwrap :: CoiterT w a -> Identity (CoiterT w a) Source #
Functor f => ComonadCofree f (Cofree f) Source #
Instance details Defined in Control.Comonad.Cofree Methods unwrap :: Cofree f a -> f (Cofree f a) Source #
ComonadCofree f w => ComonadCofree f (EnvT e w) Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: EnvT e w a -> f (EnvT e w a) Source #
ComonadCofree f w => ComonadCofree f (StoreT s w) Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: StoreT s w a -> f (StoreT s w a) Source #
(ComonadCofree f w, Monoid m) => ComonadCofree f (TracedT m w) Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: TracedT m w a -> f (TracedT m w a) Source #
(Functor f, Comonad w) => ComonadCofree f (CofreeT f w) Source #
Instance details Defined in Control.Comonad.Trans.Cofree Methods unwrap :: CofreeT f w a -> f (CofreeT f w a) Source #
ComonadCofree f w => ComonadCofree f (IdentityT w) Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: IdentityT w a -> f (IdentityT w a) Source #
ComonadCofree (Const b :: Type -> Type) ((,) b) Source #
Instance details Defined in Control.Comonad.Cofree.Class Methods unwrap :: (b, a) -> Const b (b, a) Source #

headF :: forall (f :: Type -> Type) a b. CofreeF f a b -> a Source #

Extract the head of the base functor

tailF :: CofreeF f a b -> f b Source #

Extract the tails of the base functor

transCofreeT :: forall g (w :: Type -> Type) f a. (Functor g, Comonad w) => (forall x. f x -> g x) -> CofreeT f w a -> CofreeT g w a Source #

Lift a natural transformation from f to g into a comonad homomorphism from CofreeT f w to CofreeT g w

coiterT :: (Functor f, Comonad w) => (w a -> f (w a)) -> w a -> CofreeT f w a Source #

Unfold a CofreeT comonad transformer from a coalgebra and an initial comonad.