# StreamLoader A loader backed by a custom async sequence. ``` struct StreamLoader where Sample : SampleProtocol ``` ## Overview ```swift let loader = StreamLoader(stream: AsyncThrowingStream { continuation in continuation.yield(ModelSample(prompt: "What is 2+2?", expected: "4")) continuation.finish() }) ``` ## Topics ### Initializers [`init(stream: some Sendable & AsyncSequence)`](/documentation/Evaluations/StreamLoader/init(stream:)) Creates a loader backed by the given async sequence. ### Instance Properties [`var stream: any AsyncSequence`](/documentation/Evaluations/StreamLoader/stream) The async sequence that forwards each sample from the underlying async sequence during an evaluation run. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`Loader`](/documentation/Evaluations/Loader) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- 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)