# withUnsafeUnderlyingArray(_:) Calls a closure with an unsafe reference to the array. ``` func withUnsafeUnderlyingArray(_ closure: (xpc_object_t) throws -> ReturnType) rethrows -> ReturnType ``` ## Parameters `closure` A closure that takes an [`xpc_object_t`](/documentation/XPC/xpc_object_t) parameter. If `closure` has a return value, that value is also used as the return value for the withUnsafeUnderlyingArray(body:) function. ## Return Value The return value, if any, of the closure. --- 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)