Property Wrapper with Multiple Arguments

Using Swift
5

I think I understand what @Andrew_Arnopoulos is getting at. I don't see any reason why the initial value of test needs to be provided inline with the declaration, since it will ultimately be provided in the synthesized initializer. I don't see anywhere he's trying to initialize an instance of Multiple without providing a wrappedValue. The fully-expanded example would be:

// User writes
struct Test {
  @Multiple(argument: 5) var test: String
}

// Compiler synthesizes:
struct Test {
  var _test: Multiple<String>
  var test: String {
    get { _test.wrappedValue }
    set { _test.wrappedValue = newValue }
  }

  init(test: String) {
    _test = Multiple(wrappedValue: test, argument: 5)
  }
}

Have I messed up the transformation for the property wrapper and/or the synthesized initializer somewhere?

6 Likes