module Control.Joint.Schemes.TU 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 (Primary, run)) newtype TU t u a = TU (t :. u := a) instance Interpreted (TU t u) where type Primary (TU t u) a = t :. u := a run (TU x) = x instance Monad t => MonadTrans (TU t) where lift = TU . return instance Comonad t => ComonadTrans (TU t) where lower (TU x) = extract x