[swift-evolution] Enhanced Existentials

[Russ Bishop]

> On Jan 7, 2017, at 9:17 PM, Douglas Gregor <dgregor at apple.com> wrote:
> 
> 
> 
> Sent from my iPhone
> 
>> On Jan 6, 2017, at 11:04 PM, Russ Bishop <xenadu at gmail.com> wrote:
>> 
>> 
>>> On Jan 4, 2017, at 8:48 PM, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
>>> 
>>> 
>>>> 
>>>> Would love to see this come forward into discussion.
>>> 
>>> Yeah. I'm less sure about the other enhancements to existentials fitting into Swift 4, e.g., the creation of existentials for protocols with associated types. Although important, it's a big feature that will take a bunch of design and implementation time, and I'm leery of accepting something that we might not actually be able to achieve. 
>>> 
>>> - Doug
>> 
>> By this are you referring to generalized existentials?
> 
> Yes. I actually prefer the term "generalized existentials".
> 
>> If so I’ll say this is such a constant pain point and perverts so many API designs… not to mention vomiting AnyXYZ type-erased wrappers everywhere… In my completely non-authoritative personal opinion we shouldn’t ship Swift 4 without it :)
> 
> To be absolutely clear, I think this is an extremely important feature. It's also a significant undertaking in both design and implementation. 

If I could wish for just one pony this year…. ;)


Russ
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.swift.org/pipermail/swift-evolution/attachments/20170109/9608687d/attachment.html>