Control.Eff.Lift

Lifting primitive Monad types to effectful computations. We only allow a single Lifted Monad because Monads aren't commutative (e.g. Maybe (IO a) is functionally distinct from IO (Maybe a)).

Documentation

data Lift m v

Lift a Monad m to an effect.

Constructors

forall a . Lift (m a) (a -> v)

Instances

Functor (Lift m)

Typeable ((* -> *) -> * -> *) Lift

lift :: (Typeable m, SetMember Lift (Lift m) r) => m a -> Eff r a

Lift a Monad to an Effect.

runLift :: (Monad m, Typeable m) => Eff (Lift m :> ()) w -> m w

The handler of Lift requests. It is meant to be terminal: we only allow a single Lifted Monad.