| Portability | portable |
|---|---|
| Stability | experimental |
| Maintainer | ross@soi.city.ac.uk |
| Safe Haskell | Safe-Inferred |
Control.Monad.Trans.Identity
Description
The identity monad transformer.
This is useful for functions parameterized by a monad transformer.
- newtype IdentityT m a = IdentityT {
- runIdentityT :: m a
- mapIdentityT :: (m a -> n b) -> IdentityT m a -> IdentityT n b
- liftCatch :: (m a -> (e -> m a) -> m a) -> IdentityT m a -> (e -> IdentityT m a) -> IdentityT m a
- liftCallCC :: (((a -> m b) -> m a) -> m a) -> ((a -> IdentityT m b) -> IdentityT m a) -> IdentityT m a
The identity monad transformer
The trivial monad transformer, which maps a monad to an equivalent monad.
Constructors
| IdentityT | |
Fields
| |
Instances
| MonadTrans IdentityT | |
| Monad m => Monad (IdentityT m) | |
| Functor m => Functor (IdentityT m) | |
| MonadPlus m => MonadPlus (IdentityT m) | |
| Applicative m => Applicative (IdentityT m) | |
| Alternative m => Alternative (IdentityT m) | |
| MonadIO m => MonadIO (IdentityT m) |
mapIdentityT :: (m a -> n b) -> IdentityT m a -> IdentityT n bSource
Lift a unary operation to the new monad.
Lifting other operations
liftCatch :: (m a -> (e -> m a) -> m a) -> IdentityT m a -> (e -> IdentityT m a) -> IdentityT m aSource
Lift a catchError operation to the new monad.
liftCallCC :: (((a -> m b) -> m a) -> m a) -> ((a -> IdentityT m b) -> IdentityT m a) -> IdentityT m aSource
Lift a callCC operation to the new monad.