# init(_:) Explicit construction from an UnsafeMutablePointer. ``` init?(_ from: UnsafeMutablePointer?) ``` ## Discussion Returns nil if `from` is nil. This is inherently unsafe; UnsafeMutablePointer assumes the referenced memory has +1 strong ownership semantics, whereas AutoreleasingUnsafeMutablePointer implies +0 semantics. > Warning: Accessing `pointee` as a type that is unrelated to > the underlying memory’s bound type is undefined. --- 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)