[swift-evolution] Default implementation for protocols

[Howard Lovatt]

Thanks for the feedback.

On Sunday, 31 January 2016, Chris Lattner <clattner at apple.com> wrote:

>
> > On Jan 30, 2016, at 4:48 PM, Howard Lovatt via swift-evolution <
> swift-evolution at swift.org <javascript:;>> wrote:
> >
> > Proposal
> > =======
> > Allow protocols to define a default implementation, e.g.:
> >
> >   protocol Complex {
> >     default var re: Double = 0
> >     default var im: Double = 0
> >     var mag: Double { return sqrt(re * re + im * im) }
> >     // ...
> >   }
>
> Hi Howard,
>
> This is a desired feature, but a surprising amount of implementation
> effort blocks “just doing it”.  We hope that this will happen in Swift 3,
> but we’ll see how things work out with the other generics system
> improvements.
>
> -Chris
>
>

-- 
  -- Howard.
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