[swift-evolution] zip3, zip4, ...

[Dmitri Gribenko]

On Sun, Dec 6, 2015 at 3:34 PM, Erica Sadun via swift-evolution <
swift-evolution at swift.org> wrote:

> It's pretty easy to build your own Zips. Not sure the language really
> needs this. For example, I recently built a zip that produces (T?, T?)
> which fills one of the two with nil until both lists are consumed:
>
> func longZip<S0: SequenceType, S1: SequenceType>(seq0: S0, _ seq1: S1) ->
>     AnyGenerator<(S0.Generator.Element?, S1.Generator.Element?)> {
>


Just wanted to point out that AnyGenerator has an inherent cost from the
type erasure.  The implementation in the standard library uses generics and
is fully optimizable.

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/
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