Allow property observers to be declared in extensions

Originator:DeFrenZ
Number:rdar://22855646 Date Originated:25-Sep-2015 02:35 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Swift 2.0
Classification:Enhancement Reproducible:Not Applicable
 
Summary:
It would be really useful for code localisation to allow for property observers (willSet, didSet) to be applied in extensions and even more than once (without any specific restriction on the order they will be ran in).

e.g.

class Foo {
  private var foo: Int = 0
  private var count: Int = 0
}
//MARK: notifier
extension Foo {
  overload var foo: Int {
    didSet { print(“foo is now \(foo)”) }
  }
}
//MARK: counter
extension Foo {
  overload var foo: Int {
    didSet { count++ }
  }
}

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