| Copyright | (c) 2007 Magnus Therning |
|---|---|
| License | BSD-style (see the file LICENSE) |
| Maintainer | R.Paterson@city.ac.uk |
| Stability | experimental |
| Portability | portable |
| Safe Haskell | Safe |
| Language | Haskell98 |
Control.Monad.Trans.Identity
Description
The identity monad transformer.
This is useful for functions parameterized by a monad transformer.
Synopsis
- newtype IdentityT f a = IdentityT {
- runIdentityT :: f a
- mapIdentityT :: (m a -> n b) -> IdentityT m a -> IdentityT n b
- liftCatch :: Catch e m a -> Catch e (IdentityT m) a
- liftCallCC :: CallCC m a b -> CallCC (IdentityT m) a b
The identity monad transformer
The trivial monad transformer, which maps a monad to an equivalent monad.
Constructors
| IdentityT | |
Fields
| |
Instances
mapIdentityT :: (m a -> n b) -> IdentityT m a -> IdentityT n b #
Lift a unary operation to the new monad.
Lifting other operations
liftCallCC :: CallCC m a b -> CallCC (IdentityT m) a b #
Lift a callCC operation to the new monad.