I believe the intention is you get somethig like this (stream-cons e1 e2) = (make-stream-cons (delay e1) (delay e2))
and stream-car and stream-cdr are selectors for the stream-cons struct that also force the promises. Robby On Thu, Mar 17, 2011 at 2:51 PM, Jay McCarthy <[email protected]> wrote: > Is the question: is stream-cons a macro or a function? If it is a > function, the answer has to be diverge. I think it being a macro is a > little weird, but it being a function and the answer not being 1 is > non-streamy. > > Jay > > 2011/3/17 Robby Findler <[email protected]>: >> Matthew wrote "Streams include lists and lazy lists as produced by >> `stream-cons' >> (i.e., the usual one instead of the one currently exported by >> `racket/stream')." >> >> so I think the answer is 1. >> >> Robby >> >> On Thu, Mar 17, 2011 at 2:42 PM, Matthias Felleisen >> <[email protected]> wrote: >>> >>> On Mar 17, 2011, at 3:38 PM, Matthew Flatt wrote: >>> >>>> At Thu, 17 Mar 2011 15:34:17 -0400, Matthias Felleisen wrote: >>>>> 1. I think we should stay away from 'stream' here. >>>>> If Racket had grown out of the Unix tradition, I'd >>>>> be fine with it. But we partially grew out the >>>>> functional community, and they use 'stream' for >>>>> a narrower concept. >>>> >>>> Unless I'm confused, the proposal is to use "stream" in the >>>> functional-programming sense, not in the Unix sense. >>> >>> >>> Perhaps the misunderstanding is on my side but that's easy to resolve. >>> >>> What does >>> >>> (stream-first (stream-cons 1 (infinite-loop))) >>> >>> produce? >>> >>> -- Matthias >>> >>> _________________________________________________ >>> For list-related administrative tasks: >>> http://lists.racket-lang.org/listinfo/dev >>> >> >> _________________________________________________ >> For list-related administrative tasks: >> http://lists.racket-lang.org/listinfo/dev > > > > -- > Jay McCarthy <[email protected]> > Assistant Professor / Brigham Young University > http://faculty.cs.byu.edu/~jay > > "The glory of God is Intelligence" - D&C 93 > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
