Re: [Haskell-cafe] instance Enum Double considered not entirely great?

Chris Smith wrote:

class Ord a => Range a where...

Before adding a completely new Range class, I would suggest considering Paul Johnson's Ranged-sets package: http://hackage.haskell.org/package/Ranged-sets Ranges have many more natural operations, and interactions with other classes, than you mention. The Ranged-sets package is well thought out and general. It distinguishes carefully between discrete and non-discrete types, and provides appropriate instances for the standard types. Thanks, Yitz