Duals or ranges and reactive D

[Timon Gehr]

On 02/27/2014 01:41 PM, Szymon Gatner wrote:
> C#'s IObservable<>/IObserver<> made me think how would a dual [1][2] of
> a range concept look in D. Since D has no equivalent IEnumerable<> (as
> it is no needed thanks to templates) it is only about IEnumerator<> /
> IObserver<> part which relates to a D range.
>
> Ranges/enumerators are models of 'pull' style interface whereas their
> duals represent models of 'push' style enabling reactive programming [3]
> techniques which are really nicely solving issues of asynchronous /
> event - based programming.
>
> I suppose OutptRange is similar in concept, although it has
> 'OnCompleted' / 'OnError' missing.
>
> What do you think? Rx along with LINQ is a really clean solution to the
> problem of asynchronous ranges of values. I think it would be very nice
> to have in D too.
>
> [1] http://csl.stanford.edu/~christos/pldi2010.fit/meijer.duality.pdf
> [2] http://josemigueltorres.net/index.php/ienumerableiobservable-duality/
> [3]
> https://channel9.msdn.com/Shows/Going+Deep/Expert-to-Expert-Brian-Beckman-and-Erik-Meijer-Inside-the-NET-Reactive-Framework-Rx
>

In case you are interested, I have thrown together a small proof of 
concept implementation: http://dpaste.dzfl.pl/9d8386768da0