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Type:
Bug
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Status: Resolved
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Priority:
Medium
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Resolution: Duplicate
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Component/s: Compiler
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Labels:None
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Environment:
Xcode 7.3.1 or Xcode 8 beta 6, Swift 2.2 or latest Swift 3.0 dev snapshot
I recently spotted this pattern in UIKit
// Generic superclass
open class NSLayoutAnchor<AnchorType : AnyObject> : NSObject {}
// Non-generic subclasses with the pattern: `Sub : Super<Sub>`
open class NSLayoutXAxisAnchor : NSLayoutAnchor<NSLayoutXAxisAnchor> {}
open class NSLayoutYAxisAnchor : NSLayoutAnchor<NSLayoutYAxisAnchor> {}
open class NSLayoutDimension : NSLayoutAnchor<NSLayoutDimension> {}
If you try this patter, the compiler won't warn or raise an error:
print(1)
class Test<T> {}
class Foo : Test<Foo> {
override init() { print(2) }
func foo() { print(3) }
}
Foo().foo()
print(4)
The example above will only print "1\n" and lock on `Foo()` without any error message or crash.
- duplicates
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- Closed
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