[swift-evolution] Object declarations

[Thorsten Seitz]

I like it. Just a minor suggestion: as an object is a value and not a type it should have a name starting with lower case, i.e.

object globalResource { ... }

-Thorsten 

> Am 11.12.2015 um 23:07 schrieb Marc Knaup via swift-evolution <swift-evolution at swift.org>:
> 
> Hey guys,
> 
> I am working on a proposal which touches (and could even partially depend on) another interesting concept which I think would be a great addition for Swift.
> 
> Object declarations could be a way to declare a class or struct with exactly one instance. They are perfect for singletons, anonymous subclasses and to anonymously implement a protocol.
> 
> Here some examples how it could look like:
> 
> // singleton
> object GlobalResource {
>     func doSomething() { … }
> }
> 
> let resource = GlobalResource
> 
> // could all be the same
> resource.doSomething()
> GlobalResource.doSomething()
> GlobalResource.Type.doSomething()
> 
> 
> // anonymous subclass
> class ViewController: UIViewController {
> 
>     override func loadView() {
>         view = object: UIView {
>             // configure view
>         }
>     }
> }
> 
> 
> // anonymous protocol implementation
> protocol TapHandler {
>     func handleTap()
> }
> 
> view.tapHandler = object: TapHandler {
>     func handleTap() {
>         // …
>     }
> }
> 
> 
> Kotlin is an example for a a modern language which uses this concept:
> https://kotlinlang.org/docs/reference/object-declarations.html
> 
> 
> What do you think about such an addition?
> 
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