[swift-evolution] [Pitch] Improve `init(repeating:count)`

[Xiaodi Wu]

This would be very source-breaking, no?
On Thu, Aug 17, 2017 at 04:47 Jonathan Hull via swift-evolution <
swift-evolution at swift.org> wrote:

> +1
>
> On Aug 17, 2017, at 2:38 AM, Adrian Zubarev via swift-evolution <
> swift-evolution at swift.org> wrote:
>
> This is a small pitch which I will abandon if there is not much appetite
> for such improvement. ;)
>
> I would like to propose an improvement to an initializer of all collection
> types that provide: init(repeating repeatedValue: Element, count: Int).
>
> This change is meant to support reference type initialization on each
> iteration of the internal for-loop rather than copying the same references
> n times.
>
> The change would be really straightforward and should not break existing
> code, except that the behavior would change for class types.
>
> Instead of:
>
> init(repeating repeatedValue: Element, count: Int)
>
> let threeViews = Array(repeating: UIView(), count: 3) // contains 1 view 3 times
>
> we would have:
>
> init(repeating repeatedValue: @autoclosure () -> Element, count: Int)
>
> This simple change would allow us to construct an array of different
> objects instead of an array with n references to the same object.
>
> let threeViews = Array(repeating: UIView(), count: 3) // contains 3 different views
>
>
>
>
>
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
>
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20170817/d5888eca/attachment.html>