Control.Monad.Trans.Compose

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

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)

MonadWriter w (f (g m)) => MonadWriter w (ComposeT f g m)

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)

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)

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)

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)

Methods

lift :: Monad m => m a -> ComposeT f g m a

Monad (f (g m)) => Monad (ComposeT f g m)

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)

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)

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)

Methods

fold :: Monoid m => ComposeT f g m m -> m

foldMap :: Monoid m => (a -> m) -> ComposeT f g m a -> m

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)

Methods

traverse :: Applicative f => (a -> f b) -> ComposeT f g m a -> f (ComposeT f g m b)

sequenceA :: Applicative f => ComposeT f g m (f a) -> f (ComposeT f g m a)

mapM :: Monad m => (a -> m b) -> ComposeT f g m a -> m (ComposeT f g m b)

sequence :: Monad m => ComposeT f g m (m a) -> m (ComposeT f g m a)

MonadIO (f (g m)) => MonadIO (ComposeT f g m)

Methods

liftIO :: IO a -> ComposeT f g m a

Alternative (f (g m)) => Alternative (ComposeT f g m)

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)

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)

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)

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)

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)

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)

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.