On Thursday, April 9, 2015 at 9:28:54 AM UTC-6, Justin Zamora wrote: > Why not use streams? http://docs.racket-lang.org/reference/streams.html > > Justin > > On Apr 9, 2015 11:22 AM, "Jerry Jackson" <jrry...@gmail.com> wrote: > Hello, > > > > I'm building a language with racket that includes lazy lists. I'm building > lazy lists with mcons cells. The compatibility/mlist module has lots of > support functions but I'd like to be able to apply racket functions to the > lists I've constructed and I don't see any "mapply". I understand that the > use of mutable cons cells is discouraged but I don't currently know of a > better way to do lazy lists. If there is a different recommended way, I'd > like to know about it. If not: > > > > 1) Is there an equivalent of mapply that I just haven't found or > > 2) Is there a reason it's a really bad idea or > > 3) Was it just left out because nobody so far needed it? > > > > Thanks for any help, > > > > --Jerry Jackson > > > > -- > > You received this message because you are subscribed to the Google Groups > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send an > email to racket-users...@googlegroups.com. > > For more options, visit https://groups.google.com/d/optout.
I can't use streams because I'm not just using traditional lazy lists; I'm constructing them from the multiple results of a goal-driven system with backtracking. The lazy lists are built via delimited continuations. Also, I'm supporting semi-greedy lists in that I want to fully populate shorter lists under some circumstances for performance so I generate the first N entries before suspending (unless the list is recursively specified which requires one-by-one semantics). -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
