[swift-evolution] Closure delegation

[James Campbell]

Could you explain a little more its a bit confusing ?

On Fri, Dec 11, 2015 at 10:32 AM, Pierre Monod-Broca via swift-evolution <
swift-evolution at swift.org> wrote:

> A groovy closure can have a delegate which replaces `this` as the default
> receiver. The issue in groovy is that it is not compatible with static
> compilation, and there is no way to know from the code what is the type of
> the delegate.
>
> It works great for DSL. It would work great the Swift Package Manager
> manifest, among other things.
>
> It could look like this in swift
>
> protocol Bar {
>     var someConfig: String { get set }
> }
>
> func prepareSomething(setup: @delegate Bar -> () -> ()) {
>     let bar = BarImplementation()
>     // code before
>     setup(bar)()
>     // code after
> }
>
> prepareSomething { () -> () in
>     someConfig = "Hello world"
> }
>
> Where `someConfig` would refer to bar.
>
> Pierre
>
>
> _______________________________________________
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> swift-evolution at swift.org
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>
>


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