I don’t remember a proposal for that, but I would definitely support one. I
use this pattern all the time (usually by initializing to a default value
first), and it would be nice to have an explicit/safe way to handle it, (and to
avoid waisting cycles creating an object I never use).
Perhaps we should spell it @init or @initHelp:
class MyClass : MySuperClass {
let x:Int
let y:String
let z:Double
@init func commonSetup() {
self.y = “My String”
self.z = 4.2
}
init(x: Int) {
self.x = x
commonSetup() //No error because commonSetup() sets the value of ‘y’ &
‘z'
super.init()
}
}
Basically the @init functions would be inlined into the init. They would only
be callable from inits, and could only be called a single time within each init.
Thanks,
Jon
> I believe there was(was?) already a suggestion to introduce special methods
> that could be called from initializers. IMO this is a better solution to
> the problem as you really should not call 'usual' instance method until the
> instance is fully instantiated(super.init() called in your case):
>
> class MyClass : MySuperClass {
>
> let x : Int
> let y : String //let!
>
> initfunc calcY(somePatam: Int) -> String {
> return ....
> }
>
> init(x: Int) {
> self.x = x
> self.y = assignY(5)
> super.init()
> }
> }
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