Module

Control.Monad.Identity.Trans

#IdentityT

newtype IdentityT :: forall k. (k -> Type) -> k -> Typenewtype IdentityT m a

The IdentityT monad transformer.

This monad acts like a placeholder for functions that take a monad transformer as an argument, similar to identity for functions and Identity for monads.

Constructors

IdentityT (m a)

Instances

(Eq1 m, Eq a) => Eq (IdentityT m a)
(Ord1 m, Ord a) => Ord (IdentityT m a)
(Eq1 m) => Eq1 (IdentityT m)
(Ord1 m) => Ord1 (IdentityT m)
Newtype (IdentityT m a) _
(Functor m) => Functor (IdentityT m)
(Apply m) => Apply (IdentityT m)
(Applicative m) => Applicative (IdentityT m)
(Alt m) => Alt (IdentityT m)
(Plus m) => Plus (IdentityT m)
(Alternative m) => Alternative (IdentityT m)
(Bind m) => Bind (IdentityT m)
(Monad m) => Monad (IdentityT m)
(MonadRec m) => MonadRec (IdentityT m)
(MonadZero m) => MonadZero (IdentityT m)
(MonadPlus m) => MonadPlus (IdentityT m)
MonadTrans IdentityT
(MonadEffect m) => MonadEffect (IdentityT m)
(MonadCont m) => MonadCont (IdentityT m)
(MonadThrow e m) => MonadThrow e (IdentityT m)
(MonadError e m) => MonadError e (IdentityT m)
(MonadAsk r m) => MonadAsk r (IdentityT m)
(MonadReader r m) => MonadReader r (IdentityT m)
(MonadState s m) => MonadState s (IdentityT m)
(MonadTell w m) => MonadTell w (IdentityT m)
(MonadWriter w m) => MonadWriter w (IdentityT m)
(Foldable m) => Foldable (IdentityT m)
(Traversable m) => Traversable (IdentityT m)

#runIdentityT

runIdentityT :: forall m a. IdentityT m a -> m a

Run a computation in the IdentityT monad.

#mapIdentityT

mapIdentityT :: forall m1 m2 a b. (m1 a -> m2 b) -> IdentityT m1 a -> IdentityT m2 b