# update(_:) Updates the transform data in place synchronously on the CPU. ``` final func update(_ body: @_lifetime(0: copy 0) (inout MutableSpan) throws(E) -> R) throws(E) -> R where E : Error, R : ~Copyable ``` ## Parameters `body` A closure that receives a mutable span over the transform data for in-place modification. ## Discussion You pass a closure that receives a mutable span representing the transform data, which the closure may modify. This span is valid only for the duration of the closure. > Throws: Any error thrown by `body`. --- 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)