On Thu, 2 Sep 2010 19:30:17 +0200, Daniel Fischer <daniel.is.fisc...@web.de> wrote: > Why would one consider using Ord for Map an abuse? > A kludge, for performance reasons, but an abuse?
Because it forces one to declare Ord instances for types which have no natural ordering. It is useful to *not* have such instances, in order to catch programming errors. A separate type class for types which can be ordered in some (possibly arbitrary) way, for use in Data.Map, would remedy this. Regards, Arie _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
