[swift-evolution] Proposal for generic protocols

[David Hart]

I have been waiting a long time for something like this. I’m 100% behind this.

> On 03 Dec 2015, at 23:12, Tal Atlas <me at tal.by> wrote:
> 
> With the awesome expansion of protocol oriented programming that swift has allowed, the lack of generic protocols has felt noticeably lacking and painful in some cases. I made an in depth proposal here: https://github.com/tal/swift-evolution/blob/tal/generic-protocol-proposal/proposals/NNNN-add-generic-protocols.md <https://github.com/tal/swift-evolution/blob/tal/generic-protocol-proposal/proposals/NNNN-add-generic-protocols.md>
> 
> But the tl;dr is this:
> 
> protocol Validator<TypeToValidate> {
>   var value: TypeToValidate { get set }
>   var valueIfValid: TypeToValidate? { get }
> }
> 
> struct FooStringValidator: Validator<String> {
>   //... implementation
> }
> 
> let stringValidator: Validator<String>
> 
> Look forward to hearing some feedback.
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