13 Mar
2009
13 Mar
'09
4:25 a.m.
Am Freitag, 13. März 2009 04:53 schrieb Brandon S. Allbery KF8NH:
On 2009 Mar 12, at 22:54, Mark Spezzano wrote:
I was wondering what the best way to implement Natural number would be. Is there a package which already does this?
type-level on Hackage.
I think, the original poster wanted value-level naturals, not type-level naturals.
2. Use the type data Natural = Zero | Succ !Natural
One of the reasons people use type-level naturals is to get laziness; you've made this strict. Is there a reason?
Do you really mean type-level naturals? The following is a definition of value-level naturals: data Natural = Zero | Succ Natural Type-level naturals would be defined like this: data Zero data Succ nat Best wishes, Wolfgang