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

Should we have a class for diffing? #52

Open

endgame opened this issue Jan 18, 2023 · 0 comments

Contributor

endgame commented Jan 18, 2023

From a discussion with a colleague, the following class emerged:

-- | Law: applyAlways (diff x y) x = y
class Patch p => Diff p where
  -- | @diff from to@ returns a patch which turns @from@ into @to@.
  diff :: PatchTarget p -> PatchTarget p -> p

It seems useful, even if we cannot guarantee that such a class exists for every patch type.

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