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.

Documentation

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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