# withExtendedLifetime(_:_:) Evaluates a closure while ensuring that the given instance is not destroyed before the closure returns. ``` func withExtendedLifetime(_ x: borrowing T, _ body: () throws(E) -> Result) throws(E) -> Result where E : Error, T : ~Copyable, T : ~Escapable, Result : ~Copyable ``` ## Parameters `x` An instance to preserve until the execution of `body` is completed. `body` A closure to execute that depends on the lifetime of `x` being extended. If `body` has a return value, that value is also used as the return value for the `withExtendedLifetime(_:_:)` method. ## Return Value The return value, if any, of the `body` closure parameter. --- 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)