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Control.Monad.Trans

Portability	portable
Stability	experimental
Maintainer	libraries@haskell.org

Description

The MonadTrans class.

Inspired by the paper Functional Programming with Overloading and Higher-Order Polymorphism, Mark P Jones (http://www.cse.ogi.edu/~mpj) Advanced School of Functional Programming, 1995.

class MonadTrans t where

Methods

lift :: (Monad m) => m a -> t m a

Instances

MonadTrans (ContT r)

(Error e) => MonadTrans (ErrorT e)

MonadTrans ListT

(Monoid w) => MonadTrans (RWST r w s)

MonadTrans (ReaderT r)

MonadTrans (StateT s)

(Monoid w) => MonadTrans (WriterT w)

class (Monad m) => MonadIO m where

Methods

liftIO :: IO a -> m a

Instances

(MonadIO m) => MonadIO (ContT r m)

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

(MonadIO m) => MonadIO (ListT m)

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

(MonadIO m) => MonadIO (ReaderT r m)

(MonadIO m) => MonadIO (StateT s m)

MonadIO IO

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

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