[swift-evolution] Property with class and protocol type

[Adrian Zubarev]

=D

We’re already discussing this in a looooot (I mean really lot) different threads.

Search for existentials or Any<…> or type<…> or All<…>.

SE–0095 is the first step in that direction. We want a shorthand version first and design a more complex functionality like Any<…> later.

Any<UIViewController, Protocol1, Protocol2> (I prefer this one)
or Any<UIViewController & Protocol1 & Protocol2>
After Swift 3 will drop I’ll submit a proposal for class-requirement for the shorthand version: UIViewController & Protocol1 & Protocol2 or a type alias: typealias CustomConstrainedController = UIViewController & Protocol1 & Protocol2


-- 
Adrian Zubarev
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Am 14. Juni 2016 um 18:59:54, Adrian Śliwa via swift-evolution (swift-evolution at swift.org) schrieb:

Hi all,

In Obj-C we have:
@property UIViewController<Protocol1, Protocol2, ...> *viewController;
Is there any reason we don't have in Swift:
var viewController: UViewController<Protocol1, Protocol2, ...>
Do you think it will be nice feature to have in Swift?
One example I have is is to have VC's container with view controllers(some forms) which implement Validable protocol to enforce them to have implementation of this method and to prevent situation that there is somewhere default implementation of the method "isValid" e.g. in superclass or protocol extension.
What are your thoughts?

Cheers,
Adrian
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