[swift-evolution] Ad hoc enums / options

[Kevin Nattinger]

Definitely an interesting idea, and I like it, but how would this be used from Objective C? 
> On May 31, 2016, at 9:16 AM, Erica Sadun via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Here's a function signature from some code from today:
> 
> func scaleAndCropImage(
>     image: UIImage,
>     toSize size: CGSize,
>     fitImage: Bool = true
>     ) -> UIImage {
> 
> 
> And here's what I want the function signature to actually look like:
> 
> func scaleAndCropImage(
>     image: UIImage,
>     toSize size: CGSize,
>     operation: (.Fit | .Fill) = .Fit
>     ) -> UIImage {
> 
> 
> where I don't have to establish a separate enumeration to include ad-hoc enumeration-like semantics for the call. A while back, Yong hee Lee introduced anonymous enumerations (and the possibility of anonymous option flags) but the discussion rather died.
> 
> I'm bringing it up again to see whether there is any general interest in pursuing this further as I think the second example is more readable, appropriate, and Swifty than the first, provides better semantics, and is more self documenting.
> 
> Thanks for your feedback,
> 
> -- Erica
> 
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