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rintaro 2/22/2018 5:36 AM
一応注意喚起しておくと class 制約は AnyObject と同意になり、 class は deprecated です。 https://github.com/apple/swift-evolution/blob/master/proposals/0156-subclass-existentials.md#class-and-anyobject
apple/swift-evolution
swift-evolution - This maintains proposals for changes and user-visible enhancements to the Swift Programming Language.
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