What do you mean by "go before review"? I moved the proposal to a new thread: [Proposal] New mechanism to combine Types with/or Protocols
Feel free to read the formatted document, provide me some feedback and point me to typos if you spot any. I'll add the possibility to allow multiple reference/value types within the angle brackets as a considered alternative. I finally understand what Thorsten meant with this example: func intersect<T, U>(set1: Set<T>, set2: Set<U>) -> Set<All<T, U>> If T == U we'll get All<T, T> == T Or simply: func intersect<T>(set1: Set<T>, set2: Set<T>) -> Set<All<T>> This makes more sense to me. :) -- Adrian Zubarev Am 17. Mai 2016 um 09:09:55, Austin Zheng via swift-evolution (swift-evolution@swift.org(mailto:swift-evolution@swift.org)) schrieb: > > This is the proposal I'd like to see go before review, and the one I think is > closest in spirit to the generics roadmap. > > Things like adding union types, and rewriting Swift's type system to look > like Scala's, have very little to do with better representations of > existentials, and belong in a follow-up proposal. > > Austin > > > On May 16, 2016, at 11:55 PM, Brent Royal-Gordon via swift-evolution > > <swift-evolution@swift.org> wrote: > > > > > But don't you mean the union type of all possible Collection types when > > > you write Any<Collection>? > > > > No, I mean "an existential capable of holding any Collection". > > > > If I write Any<Equatable, Collection>, I mean "an existential capable of > > holding any Equatable Collection". > > > > If I write Any<UITableViewCell, CounterDisplaying>, I mean "an existential > > capable of holding any CounterDisplaying UITableViewCell". > > > > If I write Any<Collection where .Element: Equatable>, I mean "an > > existential capable of holding any Collection with an Equatable Element". > > > > If I write Any<class>, I mean "An existential capable of holding any class > > instance". > > > > If I write Any, I mean "An existential capable of holding anything". > > > > Union types have nothing to do with it. > > > > -- > > Brent Royal-Gordon > > Architechies > > > > _______________________________________________ > > swift-evolution mailing list > > swift-evolution@swift.org > > https://lists.swift.org/mailman/listinfo/swift-evolution > > _______________________________________________ > swift-evolution mailing list > swift-evolution@swift.org > https://lists.swift.org/mailman/listinfo/swift-evolution
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