DrIFT which i am now maintaining can derive such utility functions out
of the box. just add a {-!deriving: update -} to get update functions
for every labeled field in a datatype. quite useful, I have not updated
the web page yet, but the new DrIFT homepage will be athttp://homer.netmar.com/~john/computer/haskell/DrIFT/ On Mon, May 06, 2002 at 07:36:30PM +0100, Jorge Adriano wrote: > Anyway I'd prefer to have some way to 'derive' apply and set functions. > Something like > > data MyData = MyData { foo :: fooType, bar :: ..., .... } > > deriving (Set, Apply) > > Using the keyword "deriving" would probably be a bad idea though :) > The set and apply functions could be derived with a standard postfix or maybe > prefix... fooAp or apFoo. > Maybe we could introduce sintax to specify it... > > deriving (Set with "set", Apply with "ap") > > I don't know... I'm just brainstorming right now. > Having actual functions is important. I don't think I have to explain why to > people in this mailing list :-) > > > Anyway, does such a thing exist, and, if not, is there any chance it could > > exist, or is it just syntactic salt to too many people? :) > I whish you better luck than I've had so far whenever making posts about this > same issue ;) > -- --------------------------------------------------------------------------- John Meacham - California Institute of Technology, Alum. - [EMAIL PROTECTED] --------------------------------------------------------------------------- _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
