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Should we have a class for diffing? #52

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endgame opened this issue Jan 18, 2023 · 0 comments
Open

Should we have a class for diffing? #52

endgame opened this issue Jan 18, 2023 · 0 comments

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@endgame
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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.

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