Fwd: [Haskell-cafe] Defining methods generically for a class

8 Jan 2009

      ---------- Forwarded message ----------
From: Jeff Heard 
Date: Thu, Jan 8, 2009 at 12:26 PM
Subject: Re: [Haskell-cafe] Defining methods generically for a class
To: Cristiano Paris 

Not really...  I'm not testing if each of the items a are equal, but
rather that in the context of them being a Region, they are equal.As
long "dim" (which is in the class) can be defined, then equality is
defined over all types Region.

On Thu, Jan 8, 2009 at 12:16 PM, Cristiano Paris  wrote:
...
On Thu, Jan 8, 2009 at 6:04 PM, Jeff Heard  wrote:
...
...
How do I declare all Regions to be Eqs without putting it in the class
body (since I define a function over all Regions that is independent
of datatype that is an instance of Region)?
Would this be a solution?
class Eq a => Region a where
 ...
Cristiano