[Haskell-cafe] Re: Why is Day and Month bounded?

[Chris Kuklewicz]

David House wrote:
> On 14/07/06, David Roundy <droundy at darcs.net> wrote:
>> Anyhow, just thought I'd mention that
>> this isn't useful only for "ordinary" cyclic objects like dates.
> 
> Correct. Which is why Chris Kuklewicz included instances for, e.g., Int :)

And the new version takes everything to Integer so there is never any internal 
overflow.

> I think this would be a great class to have in the standard libs. It
> would be even better if we could derive it.
> 

All the existing instances are just three words:

instance Cyclic Foo

You only need more if you have something strange, or you want to avoid 
projecting to Integer.

-- 
Chris