# Publishers.Autoconnect A publisher that automatically connects to an upstream connectable publisher. ``` class Autoconnect where Upstream : ConnectablePublisher ``` ## Overview This publisher calls [`connect()`](/documentation/Combine/ConnectablePublisher/connect()) on the upstream [`ConnectablePublisher`](/documentation/Combine/ConnectablePublisher) when first attached to by a subscriber. ## Topics ### Creating an autoconnect publisher [`init(upstream: Upstream)`](/documentation/Combine/Publishers/Autoconnect/init(upstream:)) Creates a publisher that automatically connects to an upstream connectable publisher. ### Declaring supporting types [`typealias Output`](/documentation/Combine/Publishers/Autoconnect/Output) The kind of values published by this publisher. [`typealias Failure`](/documentation/Combine/Publishers/Autoconnect/Failure) The kind of errors this publisher might publish. ### Inspecting publisher properties [`let upstream: Upstream`](/documentation/Combine/Publishers/Autoconnect/upstream) The publisher from which this publisher receives elements. ## Relationships ### Conforms To [`Publisher`](/documentation/Combine/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)