# IteratorSequence A sequence built around an iterator of type `Base`. ``` @frozen struct IteratorSequence where Base : IteratorProtocol ``` ## Overview Useful mostly to recover the ability to use `for`…`in`, given just an iterator `i`: ``` for x in IteratorSequence(i) { ... } ``` --- 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)