transformers-0.2.2.0: Concrete functor and monad transformersSource codeContentsIndex
Control.Monad.IO.Class
Portabilityportable
Stabilityexperimental
Maintainerross@soi.city.ac.uk
Description
Class of monads based on IO.
Synopsis
class Monad m => MonadIO m where
liftIO :: IO a -> m a
Documentation
class Monad m => MonadIO m whereSource

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:

Methods
liftIO :: IO a -> m aSource
Lift a computation from the IO monad.
show/hide Instances
MonadIO IO
MonadIO m => MonadIO (IdentityT m)
MonadIO m => MonadIO (ListT m)
MonadIO m => MonadIO (MaybeT 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)
(Monoid w, MonadIO m) => MonadIO (RWST r w s m)
(Monoid w, MonadIO m) => MonadIO (RWST r w s m)
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