[swift-evolution] Object declarations

[Marc Knaup]

Actually it's both - an object and a type. It's an object which describes
itself.

Btw. I have the same problem with enum cases. They're values so why are
they uppercase?

On Fri, Dec 11, 2015 at 11:25 PM, Thorsten Seitz <tseitz42 at icloud.com>
wrote:

> 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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> swift-evolution at swift.org
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>
>
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