Generalize.
On Sun, Jul 25, 2010 at 9:47 PM, Todd O'Bryan <[email protected]> wrote: > 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
