[swift-dev] Starter project: API to upgrade AnySequence to Any*Collection

[Jacob Bandes-Storch]

What do you mean by "without copying the underlying collection"? Is this
specifically for the case where the AnySequence is wrapping a collection
(which is not always the case)?

On Mon, Dec 7, 2015 at 2:18 PM, Dmitri Gribenko via swift-dev <
swift-dev at swift.org> wrote:

> It would require a proposal and a review, but the implementation is
> more challenging here than the API design.  The proposal would be
> trivial, just one extra API, if I'm imagining this correctly.
>
> Dmitri
>
> On Mon, Dec 7, 2015 at 2:10 PM, Austin Zheng <austinzheng at gmail.com>
> wrote:
> > Would this require a review/proposal, since it involves an API change?
> >
> > On Mon, Dec 7, 2015 at 2:08 PM, Dmitri Gribenko via swift-dev
> > <swift-dev at swift.org> wrote:
> >>
> >> Hi,
> >>
> >> If someone looks for a starter project in the standard library with
> >> intermediate complexity (prior experience with Swift generics
> >> required), here's one.
> >>
> >> This is in the area of existential sequence and collection wrappers.
> >>
> >> Upgrading AnyForwardCollection to AnyRandomAccessCollection works:
> >>
> >> (swift) AnyRandomAccessCollection(AnyForwardCollection([1,2,3]))
> >> // r2 : AnyRandomAccessCollection<Int>? =
> >> Optional(Swift.AnyRandomAccessCollection<Swift.Int>(_box:
> >> Swift._CollectionBox<Swift.Array<Swift.Int>>))
> >>
> >> Seems like we don't provide APIs to upgrade AnySequence to
> Any*Collection:
> >>
> >> (swift) AnyRandomAccessCollection(AnySequence([1,2,3]))
> >> <REPL Input>:1:1: error: cannot invoke initializer for type
> >> 'AnyRandomAccessCollection<_>' with an argument list of type
> >> '(AnySequence<Int>)'
> >>
> >> Of course, this should work without copying the underlying collection.
> >>
> >> https://bugs.swift.org/browse/SR-119
> >>
> >> 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>*/
> >> _______________________________________________
> >> swift-dev mailing list
> >> swift-dev at swift.org
> >> https://lists.swift.org/mailman/listinfo/swift-dev
> >
> >
>
>
>
> --
> 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>*/
> _______________________________________________
> swift-dev mailing list
> swift-dev at swift.org
> https://lists.swift.org/mailman/listinfo/swift-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-dev/attachments/20151207/2c7b9d11/attachment.html>