[Haskell-cafe] No Enum for (,), no Enum or Bounded for Either
lysxia at gmail.com
Fri Jun 1 18:23:58 UTC 2018
One issue is that (Int, Int) is too big to define toEnum/fromEnum.
On 06/01/2018 02:10 PM, Tom Ellis wrote:
> I'm a bit surprised that whilst `Either` and `(,)` have instances for `Ord`
> * `(,)` has no instance for `Enum`
> * `Either` has no instance for `Enum` or `Bounded`
> Is there a particular reason for that? It might be tricky to implement
> toEnum :: Int -> a
> fromEnum :: a -> Int
> but in the presence of `Bounded` that should be possible.
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