# init(unsafeAddress:mutating:) Unsafely initializes an instance of `MutableRef` using the given ‘unsafeAddress’ as the mutable reference based on the mutating lifetime of the given ‘owner’ argument. ``` init(unsafeAddress pointer: UnsafeMutablePointer, mutating owner: inout Owner) where Owner : ~Copyable, Owner : ~Escapable ``` ## Parameters `pointer` The address to use to mutably reference an instance of type `Value`. `owner` The owning instance that this `MutableRef` instance’s lifetime is based on. --- 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)