Huh? Are you talking about the set-posn-x! and set-posn-y! mutators or something else?
I just want something of the form: ;; posn-update-x: posn number -> posn ;; posn-update-y: posn number -> posn Completely non-mutational--just recreates the exact same structure, except for the updated value. Which lvalues am I missing? Todd On Sun, Jul 25, 2010 at 6:44 PM, Shriram Krishnamurthi <[email protected]> wrote: > Todd, > > Danny has defined updaters for his world. However, the reason we > didn't make these public is because we ultimately need to deal with > lvalues, which (a) are arguably not a good idea, and (b) we certainly > can't do as a macro anyway. Make sure you think about that. > > Shriram > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
