module Control.Monad.Cont.Extras
( MonadCont1(..)
) where
#if __GLASGOW_HASKELL__ < 710
import Data.Monoid
#endif
import Control.Monad.Trans.Class
import Control.Monad.Cont
import qualified Control.Monad.Trans.Except as E
import qualified Control.Monad.Trans.Identity as I
import qualified Control.Monad.Trans.List as L
import qualified Control.Monad.Trans.Maybe as M
import qualified Control.Monad.Trans.Reader as R
import qualified Control.Monad.Trans.RWS.Lazy as RWS.Lazy
import qualified Control.Monad.Trans.RWS.Strict as RWS.Strict
import qualified Control.Monad.Trans.State.Lazy as S.Lazy
import qualified Control.Monad.Trans.State.Strict as S.Strict
import qualified Control.Monad.Trans.Writer.Lazy as W.Lazy
import qualified Control.Monad.Trans.Writer.Strict as W.Strict
class MonadTrans t => MonadCont1 t where
callCC1 :: MonadCont m => ((a -> t m b) -> t m a) -> t m a
instance MonadCont1 (E.ExceptT e) where
callCC1 = E.liftCallCC callCC
instance MonadCont1 I.IdentityT where
callCC1 = I.liftCallCC callCC
instance MonadCont1 L.ListT where
callCC1 = L.liftCallCC callCC
instance MonadCont1 M.MaybeT where
callCC1 = M.liftCallCC callCC
instance MonadCont1 (R.ReaderT r) where
callCC1 = R.liftCallCC callCC
instance Monoid w => MonadCont1 (W.Lazy.WriterT w) where
callCC1 = W.Lazy.liftCallCC callCC
instance Monoid w => MonadCont1 (W.Strict.WriterT w) where
callCC1 = W.Strict.liftCallCC callCC
instance Monoid w => MonadCont1 (RWS.Lazy.RWST r w s) where
callCC1 = RWS.Lazy.liftCallCC callCC
instance Monoid w => MonadCont1 (RWS.Strict.RWST r w s) where
callCC1 = RWS.Strict.liftCallCC callCC
instance MonadCont1 (S.Lazy.StateT s) where
callCC1 = S.Lazy.liftCallCC callCC
instance MonadCont1 (S.Strict.StateT s) where
callCC1 = S.Strict.liftCallCC callCC