Control.ContStuff.MonadsTf

This package provides contstuff transformer class instances for the monad transformers from the monads-tf package as well as monads-tf transformer class instances for the monad transformers from contstuff. This makes using both transformer libraries in a single project much more convenient as you get along with a single set of lifting functions.

Exported from monads-tf

class Monad m => MonadIO m where

Monads in which IO computations may be embedded. Any monad built by applying a sequence of monad transformers to the IO monad will be an instance of this class.

Instances should satisfy the following laws, which state that liftIO is a transformer of monads:

• liftIO . return = return

• liftIO (m >>= f) = liftIO m >>= (liftIO . f)

Methods

liftIO :: IO a -> m a

Lift a computation from the IO monad.

Instances

MonadIO IO

MonadIO m => MonadIO (ListT m)

MonadIO m => MonadIO (MaybeT m)

MonadIO m => MonadIO (IdentityT m)

MonadIO m => MonadIO (ContT r m)

MonadIO m => MonadIO (MaybeT r m)

MonadIO m => MonadIO (ContT r m)

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

MonadIO m => MonadIO (ReaderT r m)

MonadIO m => MonadIO (StateT s m)

MonadIO m => MonadIO (StateT s m)

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

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

MonadIO m => MonadIO (ChoiceT r i m)

MonadIO m => MonadIO (EitherT r e m)

MonadIO m => MonadIO (StateT r s m)

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

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

class MonadTrans t

The class of monad transformers. Instances should satisfy the following laws, which state that lift is a transformer of monads:

• lift . return = return

• lift (m >>= f) = lift m >>= (lift . f)

Instances

MonadTrans ListT

MonadTrans MaybeT

MonadTrans IdentityT

MonadTrans (ContT r)

MonadTrans (MaybeT r)

MonadTrans (ContT r)

Error e => MonadTrans (ErrorT e)

MonadTrans (ReaderT r)

MonadTrans (StateT s)

MonadTrans (StateT s)

Monoid w => MonadTrans (WriterT w)

Monoid w => MonadTrans (WriterT w)

MonadTrans (ChoiceT r i)

MonadTrans (EitherT r e)

MonadTrans (StateT r s)

Monoid w => MonadTrans (RWST r w s)

Monoid w => MonadTrans (RWST r w s)

liftTF :: (Monad m, MonadTrans t) => m a -> t m a

Interface to Control.Monad.Trans.lift.