# init(version:retain:release:copyDescription:compare:) ``` init(version: CFIndex, retain: ((CFAllocator?, UnsafeRawPointer?) -> UnsafeRawPointer?)!, release: ((CFAllocator?, UnsafeRawPointer?) -> Void)!, copyDescription: ((UnsafeRawPointer?) -> Unmanaged?)!, compare: ((UnsafeRawPointer?, UnsafeRawPointer?, UnsafeMutableRawPointer?) -> CFComparisonResult)!) ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)