| Portability | portable |
|---|---|
| Stability | experimental |
| Maintainer | libraries@haskell.org |
| Safe Haskell | Safe-Inferred |
Control.Monad.Trans
Description
The MonadTrans class.
Inspired by the paper /Functional Programming with Overloading and Higher-Order Polymorphism/, Mark P Jones (http://web.cecs.pdx.edu/~mpj/) Advanced School of Functional Programming, 1995.
Documentation
class MonadTrans t whereSource
Methods
lift :: Monad m => m a -> t m aSource
mt :: Monad m => Transformation t mSource
unlift :: (Monad m, Monad n) => (forall f. Functor f => (forall x. t m x -> m (f x)) -> n (f a)) -> t n aSource
tmixmap :: (Monad m, Monad n) => (forall a. m a -> n a) -> t m c -> t n cSource
Instances
| MonadTrans ListT | |
| MonadTrans IdentityT | |
| MonadTrans (ContT r) | |
| MonadTrans (StateT s) | |
| Monoid w => MonadTrans (WriterT w) | |
| Monoid w => MonadTrans (WriterT w) | |
| MonadTrans (StateT s) | |
| MonadTrans (ReaderT r) | |
| Error e => MonadTrans (ErrorT e) | |
| MonadTrans (MonadStateReaderT s) | |
| MonadTrans (Tagged tag) | |
| (MonadTrans t1, MonadTrans t2) => MonadTrans (:> t1 t2) | |
| Monoid w => MonadTrans (RWST r w s) | |
| Monoid w => MonadTrans (RWST r w s) |
class Monad m => MonadIO m whereSource
Instances
| MonadIO IO | |
| MonadIO m => MonadIO (ListT m) | |
| MonadIO m => MonadIO (ContT r 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 (StateT s m) | |
| MonadIO m => MonadIO (ReaderT r m) | |
| (Error e, MonadIO m) => MonadIO (ErrorT e m) | |
| (Monoid w, MonadIO m) => MonadIO (RWST r w s m) | |
| (Monoid w, MonadIO m) => MonadIO (RWST r w s m) |
data Transformation t m whereSource
Constructors
| MT :: Monad (t m) => Transformation t m |
tmap :: (MonadTrans t, Monad m, Monad n) => (forall a. m a -> n a) -> t m c -> t n cSource