> > Because I want to be able to make Foo values where the parameter type > > isn't in Ord, too. I just want unFoo to work on specific Foo values where > > it is.
> but your recursive function requires a recursive constraint, which your data > type does not guarantee byconstruction, and which the Ord instances do not > guarantee > due to lack of closed classes. Yeah. As you imply, I'm probably out of luck. > a rather pedestrian approach would record during construction whether or not > all parts are in Ord (see below). Unfortunately I need a (fully) polymorphic construction function, so this isn't possible. I'm trying to generalise the trick described at http://hsenag.livejournal.com/11803.html to arrows, but getting stuck with the "first" combinator. Thanks, Ganesh ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ============================================================================== _______________________________________________ Glasgow-haskell-users mailing list Glasgow-haskell-users@haskell.org http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
