Conditional didSet/willSet?

Using Swift
1

I only just discovered that this isn't valid:

    var isEditable: Bool = true {
        #if !os(tvOS)
        willSet {
            child.isEditable = newValue
        }
        #endif
    }

Does the compiler optimize out empty didSet/willSet (making it equivalent to say willSet { #if ...), or is this a missing feature?

2

It should be equivalent, but even if the extra subroutine call is not optimized away, I would not expect it to make any kind of difference in this kind of code. Subroutine calls are very cheap on modern CPUs.

1 Like
3

this example suggests the willSet does get optimized out when the conditional is false.

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