Xcode 9 beta 3 - Swift 3.2: comparing optional

Question

Project which compiles fine in Xcode 8.3.2 shows many compilation errors around comparing optional/non optional value with ==

What I have found is an older proposal for removing coparison <> for the same: https://github.com/apple/swift-evolution/blob/master/proposals/0121-remove-optional-comparison-operators.md

So now in Xcode 9, I can not even compare two optionals:

    let xxx: String? =  "A"
    let yyy: String? = "B"

    if xxx == yyy { //ERROR: Ambiguous use of operator '=='

    }

Could someone point me to a resource where this would be explained? Or is it just a temporary bug?

Thanks

It's building fine with swift 4, and swift 3.2 – Fares Benhamouda Jul 20 '17 at 13:11 — Fares Benhamouda, Jul 20 '17 at 13:11

score 0 · Accepted Answer · answered Jul 20 '17 at 13:13

0

Using XCode 9 beta (9M136h) and Swift 4, your instruction compiles.

Variants of == and != which accept optional operands are still useful, and their results unsurprising, so they will remain.

Remove the versions of <, <=, >, and >= which accept optional operands.

So your instruction should works either in Swift 3.2 or Swift 4. Check the swift version you are using in the build settings -> Swift Language Version.

answered Jul 20 '17 at 13:13

Fares Benhamouda

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8
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Sorry, my fault. There was a hidden extension overriding operator == for some type of objects. The fact is, Xcode 8 compiled the code fine, while Xcode 9 Swift 3.2 was confused. – ds77 Jul 26 '17 at 12:39

Xcode 9 beta 3 - Swift 3.2: comparing optional

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