Control.Monad.Trans.Compose

mmorph-1.0.9: Monad morphisms

Safe Haskell | Safe
Language | Haskell98

Control.Monad.Trans.Compose

Contents

- ComposeT

Description

Composition of monad transformers. A higher-order version of Data.Functor.Compose.

Synopsis

- newtype ComposeT (f :: (* -> *) -> * -> *) (g :: (* -> *) -> * -> *) m a = ComposeT {
  - getComposeT :: f (g m) a
  }
- mapComposeT :: (f (g m) a -> p (q n) b) -> ComposeT f g m a -> ComposeT p q n b

# ComposeT

newtype ComposeT (f :: (* -> *) -> * -> *) (g :: (* -> *) -> * -> *) m a infixr 9 #

Composition of monad transformers.

Constructors

ComposeT infixr 9 |
Fields getComposeT :: f (g m) a

Instances

MonadRWS r w s (f (g m)) => MonadRWS r w s (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose
MonadWriter w (f (g m)) => MonadWriter w (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods writer :: (a, w) -> ComposeT f g m a # tell :: w -> ComposeT f g m () # listen :: ComposeT f g m a -> ComposeT f g m (a, w) # pass :: ComposeT f g m (a, w -> w) -> ComposeT f g m a #
MonadState s (f (g m)) => MonadState s (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods get :: ComposeT f g m s # put :: s -> ComposeT f g m () # state :: (s -> (a, s)) -> ComposeT f g m a #
MonadReader r (f (g m)) => MonadReader r (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods ask :: ComposeT f g m r # local :: (r -> r) -> ComposeT f g m a -> ComposeT f g m a # reader :: (r -> a) -> ComposeT f g m a #
MonadError e (f (g m)) => MonadError e (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods throwError :: e -> ComposeT f g m a # catchError :: ComposeT f g m a -> (e -> ComposeT f g m a) -> ComposeT f g m a #
(MFunctor f, MonadTrans f, MonadTrans g) => MonadTrans (ComposeT f g) # |
Instance details Defined in Control.Monad.Trans.Compose Methods lift :: Monad m => m a -> ComposeT f g m a #
Monad (f (g m)) => Monad (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods (>>=) :: ComposeT f g m a -> (a -> ComposeT f g m b) -> ComposeT f g m b # (>>) :: ComposeT f g m a -> ComposeT f g m b -> ComposeT f g m b # return :: a -> ComposeT f g m a # fail :: String -> ComposeT f g m a #
Functor (f (g m)) => Functor (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods fmap :: (a -> b) -> ComposeT f g m a -> ComposeT f g m b # (<$) :: a -> ComposeT f g m b -> ComposeT f g m a #
Applicative (f (g m)) => Applicative (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods pure :: a -> ComposeT f g m a # (<*>) :: ComposeT f g m (a -> b) -> ComposeT f g m a -> ComposeT f g m b # liftA2 :: (a -> b -> c) -> ComposeT f g m a -> ComposeT f g m b -> ComposeT f g m c # (*>) :: ComposeT f g m a -> ComposeT f g m b -> ComposeT f g m b # (<*) :: ComposeT f g m a -> ComposeT f g m b -> ComposeT f g m a #
Foldable (f (g m)) => Foldable (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods fold :: Monoid m0 => ComposeT f g m m0 -> m0 # foldMap :: Monoid m0 => (a -> m0) -> ComposeT f g m a -> m0 # foldr :: (a -> b -> b) -> b -> ComposeT f g m a -> b # foldr' :: (a -> b -> b) -> b -> ComposeT f g m a -> b # foldl :: (b -> a -> b) -> b -> ComposeT f g m a -> b # foldl' :: (b -> a -> b) -> b -> ComposeT f g m a -> b # foldr1 :: (a -> a -> a) -> ComposeT f g m a -> a # foldl1 :: (a -> a -> a) -> ComposeT f g m a -> a # toList :: ComposeT f g m a -> [a] # null :: ComposeT f g m a -> Bool # length :: ComposeT f g m a -> Int # elem :: Eq a => a -> ComposeT f g m a -> Bool # maximum :: Ord a => ComposeT f g m a -> a # minimum :: Ord a => ComposeT f g m a -> a # sum :: Num a => ComposeT f g m a -> a # product :: Num a => ComposeT f g m a -> a #
Traversable (f (g m)) => Traversable (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods traverse :: Applicative f0 => (a -> f0 b) -> ComposeT f g m a -> f0 (ComposeT f g m b) # sequenceA :: Applicative f0 => ComposeT f g m (f0 a) -> f0 (ComposeT f g m a) # mapM :: Monad m0 => (a -> m0 b) -> ComposeT f g m a -> m0 (ComposeT f g m b) # sequence :: Monad m0 => ComposeT f g m (m0 a) -> m0 (ComposeT f g m a) #
MonadIO (f (g m)) => MonadIO (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods liftIO :: IO a -> ComposeT f g m a #
Alternative (f (g m)) => Alternative (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods empty :: ComposeT f g m a # (<|>) :: ComposeT f g m a -> ComposeT f g m a -> ComposeT f g m a # some :: ComposeT f g m a -> ComposeT f g m [a] # many :: ComposeT f g m a -> ComposeT f g m [a] #
MonadPlus (f (g m)) => MonadPlus (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods mzero :: ComposeT f g m a # mplus :: ComposeT f g m a -> ComposeT f g m a -> ComposeT f g m a #
MonadCont (f (g m)) => MonadCont (ComposeT f g m) # |
Instance details Defined in Control.Monad.Trans.Compose Methods callCC :: ((a -> ComposeT f g m b) -> ComposeT f g m a) -> ComposeT f g m a #
Eq (f (g m) a) => Eq (ComposeT f g m a) # |
Instance details Defined in Control.Monad.Trans.Compose Methods (==) :: ComposeT f g m a -> ComposeT f g m a -> Bool # (/=) :: ComposeT f g m a -> ComposeT f g m a -> Bool #
Ord (f (g m) a) => Ord (ComposeT f g m a) # |
Instance details Defined in Control.Monad.Trans.Compose Methods compare :: ComposeT f g m a -> ComposeT f g m a -> Ordering # (<) :: ComposeT f g m a -> ComposeT f g m a -> Bool # (<=) :: ComposeT f g m a -> ComposeT f g m a -> Bool # (>) :: ComposeT f g m a -> ComposeT f g m a -> Bool # (>=) :: ComposeT f g m a -> ComposeT f g m a -> Bool # max :: ComposeT f g m a -> ComposeT f g m a -> ComposeT f g m a # min :: ComposeT f g m a -> ComposeT f g m a -> ComposeT f g m a #
Read (f (g m) a) => Read (ComposeT f g m a) # |
Instance details Defined in Control.Monad.Trans.Compose Methods readsPrec :: Int -> ReadS (ComposeT f g m a) # readList :: ReadS [ComposeT f g m a] # readPrec :: ReadPrec (ComposeT f g m a) # readListPrec :: ReadPrec [ComposeT f g m a] #
Show (f (g m) a) => Show (ComposeT f g m a) # |
Instance details Defined in Control.Monad.Trans.Compose Methods showsPrec :: Int -> ComposeT f g m a -> ShowS # show :: ComposeT f g m a -> String # showList :: [ComposeT f g m a] -> ShowS #

mapComposeT :: (f (g m) a -> p (q n) b) -> ComposeT f g m a -> ComposeT p q n b #

Transform the computation inside a `ComposeT`.