module Control.Joint.Schemes.UT where import "comonad" Control.Comonad (Comonad (extract)) import "comonad" Control.Comonad.Trans.Class (ComonadTrans (lower)) import "transformers" Control.Monad.Trans.Class (MonadTrans (lift)) import Control.Joint.Core (type (:.), type (:=)) import Control.Joint.Abilities.Interpreted (Interpreted (Primary, run)) newtype UT t u a = UT (u :. t := a) instance Interpreted (UT t u) where type Primary (UT t u) a = u :. t := a run (UT x) = x instance Monad t => MonadTrans (UT t) where lift x = UT $ return <$> x instance Comonad t => ComonadTrans (UT t) where lower (UT x) = extract <$> x