Safe Haskell | Safe-Inferred |
---|---|
Language | Haskell2010 |
Documentation
newtype ReaderT r (m :: Type -> Type) a #
The reader monad transformer, which adds a read-only environment to the given monad.
The return
function ignores the environment, while >>=
passes
the inherited environment to both subcomputations.
ReaderT | |
|
Instances
MonadTrans (ReaderT r) | |
Defined in Control.Monad.Trans.Reader | |
Monad m => Monad (ReaderT r m) | |
Functor m => Functor (ReaderT r m) | |
MonadFix m => MonadFix (ReaderT r m) | |
Defined in Control.Monad.Trans.Reader | |
MonadFail m => MonadFail (ReaderT r m) | |
Defined in Control.Monad.Trans.Reader | |
Applicative m => Applicative (ReaderT r m) | |
Defined in Control.Monad.Trans.Reader | |
Contravariant m => Contravariant (ReaderT r m) | |
MonadZip m => MonadZip (ReaderT r m) | |
MonadIO m => MonadIO (ReaderT r m) | |
Defined in Control.Monad.Trans.Reader | |
Alternative m => Alternative (ReaderT r m) | |
MonadPlus m => MonadPlus (ReaderT r m) | |