# subscribe(_:) Attaches the specified subject to this publisher. ``` func subscribe(_ subject: S) -> AnyCancellable where S : Subject, Self.Failure == S.Failure, Self.Output == S.Output ``` ## Parameters `subject` The subject to attach to this publisher. --- 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)