On 20/01/12 16:31, Mikhail Arefiev wrote: > Is there a reason why there is no instance of (Enum a) => IArray > UArray a (other than that it will require OverlappingInstances and/or > IncoherentInstances if e. g. UArray of Bools is used in the same > code)? > > ... > > Does having such thing make any sense?
The problem is that there are Enum instances for things for which to/fromEnum doesn't make sense, such as Double, Float and Integer.
Prelude> fromEnum (12345678901234567890 :: Integer) -6101065172474983726 You wouldn't want your Integers to be stored as Ints in an array. Twan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
