[Haskell-cafe] RE: Enum class

[Arjun Guha]

Well, you already have succ:: (Enum a) => a -> a defined for all data of the 
Enum class.  You also need Bounded so that you can check maxBound.


This (untested) code should do it:

> next:: (Enum a, Bounded a) => a -> a
> next v = if (toEnum v) == (toEnum (maxBound))
>            then minBound
>            else succ v

--
Arjun Guha <guhaarju at grinnell.edu>