Haskell Core Libraries (base package)ParentContentsIndex
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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