On Sun, Aug 01, 2010 at 03:11:43PM -0400, Todd O'Bryan wrote: > There are a couple of things we could do to help with the underlying > cause. I've been looking at OCaml recently, and the construct they > have for copying and updating a record is something that maybe Racket > could use. Something like (update my-struct (<- a-field new-val) ...) > might make things less nasty to write. (Of course, since structs don't > maintain a list of their field names, this would be a pain to code > up.)
See http://docs.racket-lang.org/reference/struct-copy.html?q=struct-copy#%28form._%28%28lib._racket/private/base..rkt%29._struct-copy%29%29 This form doesn't appear to be in the teaching languages, and I haven't thought about the pedagaogical consequences of adding it. But there doesn't appear to be any technical reason why it couldn't be added. And you're right -- it is _awfully_ useful, although it occasionally hiccups when confronted with structure types that involve inheritance; I'm pretty sure I've filed some PRs on that point. Speaking of PRs -- Todd, if you were looking through the documentation trying to find this feature and couldn't, you might think about filing a ticket about this that includes the search terms you tried. Richard _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
