[swift-evolution] Ad hoc enums / options

[Charlie Monroe]

Most ideas discussed here lately cannot be used from ObjC.

> On May 31, 2016, at 6:20 PM, Kevin Nattinger via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 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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