[swift-evolution] Proposal for Passing Arrays to Variadic Functions

Kevin Ballard kevin at sb.org
Sat Dec 12 00:54:42 CST 2015

You can't use * as suggested, because that conflicts with * as a
prefix operator.

You could probably get away with using a trailing ... in the call, as in

func foo(xs: [Int]...) {    bar(xs...) }

I also wonder whether there's a reason Swift doesn't already support
this. Maybe there's some desired future change to variadic arguments to
improve performance (i.e. to avoid having to allocate an array) that
wouldn't be compatible? Although I'm not sure what that would be. Maybe
there's actually no barrier at all and it was just something that wasn't
prioritized. It would be good to know either way.


On Fri, Dec 11, 2015, at 10:43 PM, Arthur Sabintsev via swift-evolution wrote:
> Hi,
> I have put together a proposal for passing arrays to variadic
> functions (along the lines of Ruby’s Splay operator).
> Proposal:
> https://github.com/ArtSabintsev/swift-evolution/blob/master/proposals/array-variadic-function.md
> Pull Request: https://github.com/apple/swift-evolution/pull/52 Bug
> Report: https://bugs.swift.org/browse/SR-128 which led to this
> proposal
> Best,
> Arthur / Sabintsev.com[1]
> _________________________________________________
> swift-evolution mailing list swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution


  1. http://sabintsev.com
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