Control.Monad

Portability	portable
Stability	provisional
Maintainer	libraries@haskell.org

Description

class (Monad m) => MonadPlus m where

Methods

mplus :: m a -> m a -> m a

mzero :: m a

Instances

MonadPlus []

MonadPlus Maybe

MonadPlus IO

(Error e) => MonadPlus (Either e)

(Monad m, Error e) => MonadPlus (ErrorT e m)

(Monad m) => MonadPlus (ListT m)

(Monoid w, MonadPlus m) => MonadPlus (RWST r w s m)

(MonadPlus m) => MonadPlus (ReaderT r m)

(MonadPlus m) => MonadPlus (StateT s m)

(Monoid w, MonadPlus m) => MonadPlus (WriterT w m)

MonadPlus (GenParser tok st)

MonadPlus ReadP

MonadPlus ReadPrec

join :: (Monad m) => m (m a) -> m a

guard :: (MonadPlus m) => Bool -> m ()

when :: (Monad m) => Bool -> m () -> m ()

unless :: (Monad m) => Bool -> m () -> m ()

ap :: (Monad m) => m (a -> b) -> m a -> m b

msum :: (MonadPlus m) => [m a] -> m a

filterM :: (Monad m) => (a -> m Bool) -> [a] -> m [a]

mapAndUnzipM :: (Monad m) => (a -> m (b, c)) -> [a] -> m ([b], [c])

zipWithM :: (Monad m) => (a -> b -> m c) -> [a] -> [b] -> m [c]

zipWithM_ :: (Monad m) => (a -> b -> m c) -> [a] -> [b] -> m ()

foldM :: (Monad m) => (a -> b -> m a) -> a -> [b] -> m a

liftM :: (Monad m) => (a1 -> r) -> m a1 -> m r

liftM2 :: (Monad m) => (a1 -> a2 -> r) -> m a1 -> m a2 -> m r

liftM3 :: (Monad m) => (a1 -> a2 -> a3 -> r) -> m a1 -> m a2 -> m a3 -> m r

liftM4 :: (Monad m) => (a1 -> a2 -> a3 -> a4 -> r) -> m a1 -> m a2 -> m a3 -> m a4 -> m r

liftM5 :: (Monad m) => (a1 -> a2 -> a3 -> a4 -> a5 -> r) -> m a1 -> m a2 -> m a3 -> m a4 -> m a5 -> m r

class Monad m where

Methods

fail :: String -> m a

return :: a -> m a

(>>) :: m a -> m b -> m b

(>>=) :: m a -> (a -> m b) -> m b

Instances

(ArrowApply a) => Monad (ArrowMonad a)

Monad (Cont r)

(Monad m) => Monad (ContT r m)

(Error e) => Monad (Either e)

(Monad m, Error e) => Monad (ErrorT e m)

Monad Identity

(Monad m) => Monad (ListT m)

(Monoid w) => Monad (RWS r w s)

(Monoid w, Monad m) => Monad (RWST r w s m)

Monad (-> r)

Monad (Reader r)

(Monad m) => Monad (ReaderT r m)

Monad (ST s)

Monad (State s)

(Monad m) => Monad (StateT s m)

(Monoid w) => Monad (Writer w)

(Monoid w, Monad m) => Monad (WriterT w m)

Monad Maybe

Monad Gen

Monad []

Monad IO

Monad (ST s)

Monad (GenParser tok st)

Monad ReadP

Monad ReadPrec

class Functor f where

Methods

fmap :: (a -> b) -> f a -> f b

Instances

Functor (Cont r)

(Monad m) => Functor (ContT r m)

Functor (Either e)

(Monad m) => Functor (ErrorT e m)

Functor Identity

(Monad m) => Functor (ListT m)

Functor (RWS r w s)

(Monad m) => Functor (RWST r w s m)

Functor (-> r)

Functor (Reader r)

(Monad m) => Functor (ReaderT r m)

Functor (ST s)

Functor (State s)

(Monad m) => Functor (StateT s m)

Functor (Writer w)

(Monad m) => Functor (WriterT w m)

Functor Maybe

Functor Gen

(Ix i) => Functor (Array i)

Functor []

Functor IO

Functor (ST s)

Functor (GenParser tok st)

Functor ReadP

Functor ReadPrec

mapM :: (Monad m) => (a -> m b) -> [a] -> m [b]

mapM_ :: (Monad m) => (a -> m b) -> [a] -> m ()

sequence :: (Monad m) => [m a] -> m [a]

sequence_ :: (Monad m) => [m a] -> m ()

(=<<) :: (Monad m) => (a -> m b) -> m a -> m b

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