# passRetained(_:) Creates an unmanaged reference with an unbalanced retain. ``` static func passRetained(_ value: Instance) -> Unmanaged ``` ## Parameters `value` A class instance. ## Return Value An unmanaged reference to the object passed as `value`. ## Discussion The instance passed as `value` will leak if nothing eventually balances the retain. This is useful when passing an object to an API which Swift does not know the ownership rules for, but you know that the API expects you to pass the object at +1. --- 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)