New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Allow mixed stacks of RegionT and other transformers #4

Open

basvandijk opened this issue Jun 11, 2014 · 0 comments

Owner

basvandijk commented Jun 11, 2014

If allowed by GHC, add the instance:

instance (MonadTransControl t, RegionBaseControl b parent) => 
         RegionBaseControl b (t (RegionT s parent)) where
  unsafeLiftBaseWith f = 
    liftWith $ \runT -> 
      unsafeLiftBaseWith $ \runInBase ->
        f $ liftM St . runInBase . runT
  ...

This allows to have mixed stacks of RegionT transformers and other transformers.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment