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

Deferrable with default values #57

Open

Icelandjack opened this issue May 20, 2017 · 1 comment

Contributor

Icelandjack commented May 20, 2017 •

edited

Loading

These might be useful for Data.Constraint.Deferrable

deferWithDefault_ :: forall c. Deferrable c => forall r. r -> (c => r) -> r
deferWithDefault_ def r =
  case deferEither_ @c r of
    Left  err -> def
    Right a   -> a

deferWithDefault :: Deferrable c => proxy c -> r -> (c => r) -> r
deferWithDefault proxy def r =
  case deferEither proxy r of
    Left  err -> def
    Right a   -> a

The text was updated successfully, but these errors were encountered:

Owner

ekmett commented Jun 1, 2017

I have no particular objection to adding these.

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