How to access a Swift enum associated value outside of a switch statement

Question

Consider:

enum Line {     case    Horizontal(CGFloat)     case    Vertical(CGFloat) }  let leftEdge             =  Line.Horizontal(0.0) let leftMaskRightEdge    =  Line.Horizontal(0.05) 

How can I access, say, lefEdge's associated value, directly, without using a switch statement?

let noIdeaHowTo          = leftEdge.associatedValue + 0.5 

This doesn't even compile!

I had a look at these SO questions but none of the answers seem to address this issue.

The noIdeaHowTo non compiling line above should really be that one-liner, but because the associated value can be any type, I fail to even see how user code could write even a "generic" get or associatedValue method in le enum itself.

I ended up with this, but it is gross, and needs me to revisit the code each time I add/modify a case ...

enum Line {     case    Horizontal(CGFloat)     case    Vertical(CGFloat)      var associatedValue: CGFloat {         get {             switch self {                 case    .Horizontal(let value): return value                 case    .Vertical(let value): return value             }         }     } } 

Any pointer anyone?

Answer 1

As others have pointed out, this is now kind of possible in Swift 2:

import CoreGraphics  enum Line {     case    Horizontal(CGFloat)     case    Vertical(CGFloat) }  let min = Line.Horizontal(0.0) let mid = Line.Horizontal(0.5) let max = Line.Horizontal(1.0)  func doToLine(line: Line) -> CGFloat? {     if case .Horizontal(let value) = line {         return value     }     return .None }  doToLine(min) // prints 0 doToLine(mid) // prints 0.5 doToLine(max) // prints 1