# decodeOptimizer(_:) Decodes an optimizer value. ``` mutating func decodeOptimizer(_ value: T.Type) throws -> T where T : Decodable ``` ## Discussion Decoding an optimizer lets you resume fitting. --- 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)