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Anonymous class experiment in Swift
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| import Foundation | |
| protocol SomeDelegateProtocol : class { | |
| func firstFunc() -> String | |
| func secondFunc() -> Bool | |
| func thirdFunc() -> Self | |
| } | |
| class MyClass { | |
| weak var delegate : SomeDelegateProtocol? | |
| } | |
| class Parent { | |
| var child : MyClass | |
| var strongDelegate : SomeDelegateProtocol? = nil | |
| func setup() { | |
| strongDelegate = { | |
| // [self] // Original version had this not commented; it's commented to let people know it was a typo | |
| final class SomethingClass : SomeDelegateProtocol { | |
| func firstFunc() -> String { return "foo" } | |
| func secondFunc() -> Bool { return true } | |
| func thirdFunc() -> SomethingClass { return SomethingClass() } | |
| } | |
| return SomethingClass() | |
| }() | |
| child.delegate = strongDelegate | |
| } | |
| init() { | |
| self.child = MyClass() | |
| self.setup() | |
| } | |
| } | |
| var bleh = Parent() | |
| var result = bleh.child.delegate?.firstFunc() | |
| // selfResult is inferred to be type 'Optional<SomethingDelegateProtocol>'. | |
| let selfResult = bleh.child.delegate?.thirdFunc() | |
| println("Got \(result!)") |
Nothing much, my mistake! I adapted this gist from an earlier private version that was originally written for one of the early Xcode betas, and I had to make a few changes to get it working, but I was in a hurry. I modified the gist to make it a bit clearer.
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What does
[self]achieve here?