Replicate the Xojo "Assigns" feature in a Swift Program

1

As most of you know, I am working on a BASIC -> Swift translator, and one of the handy features that Xojo (for example) has, the Swift does no is the ASSIGNS feature.
Here is a snippet to demonstrate how to get that feature

BASIC

Sub myRoutine(var1 as String, var2 as Double, assigns Xyz as integer)
// do stuff
End sub

SWIFT

private enum myRoutine {
   subscript(_ var1 : String , _ var2 : Double) -> Int? {
      get { return nil }
      set { let Xyz = newValue!
      let x : Int = 3 // THIS VARIABLE IS NEVER CHANGED [PATCH]
      print(x)
   }  
}  
}

An ENUM… go figure :slight_smile:

thanks to @ JumhynFrederick Kellison-Linn on the Swift Forum for this idea.

1 Like
2

Turns out the ENUM version doesn’t work… it is Immutable… so not much good :frowning:

This one however DOES work

private Sub myRoutine(var1 as String, var2 as String, assigns Xyz as integer)
var x as integer =3
print(x)
End sub
sub test() 
 myRoutine("A","B")=3
end sub

becomes

private var myRoutine = _myRoutine()
struct _myRoutine {
   subscript(_ var1 : String , _ var2 : String) -> Int? {
      get { return nil }
      set { 
      let Xyz = newValue!
      let x : Int = 3 
      print(x)
   } 
} 
}
func test() {
   myRoutine["A" , "B"] = 3
}