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Add a class for free monad transformer-type things. #209

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treeowl opened this issue Jul 11, 2021 · 0 comments

treeowl commented Jul 11, 2021

We can do something like the following:

class FreeMonad f n => FreeMonadTransed f m n | n -> f m where
  loft :: m a -> n a
  default loft :: (n ~ t m, MonadTrans t, Monad m) => m a -> n a
  loft = lift

instance (Functor f, Monad m) => FreeMonadTransed f m (Free f m)
instance Monad m => FreeMonadTrans f m (FT f m)

treeowl closed this as completed

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