# BorrowingIteratorAdapter ``` @frozen struct BorrowingIteratorAdapter where Iterator : IteratorProtocol ``` ## Topics ### Initializers [`init(iterator: Iterator)`](/documentation/Swift/BorrowingIteratorAdapter/init(iterator:)) ### Instance Methods [`func nextSpan(maxCount: Int) -> Span`](/documentation/Swift/BorrowingIteratorAdapter/nextSpan(maxCount:)) Returns a span over the next group of elements that are ready to by visited, up to the specifed maximum. ### Type Aliases [`typealias Element`](/documentation/Swift/BorrowingIteratorAdapter/Element) [`typealias Failure`](/documentation/Swift/BorrowingIteratorAdapter/Failure) ### Default Implementations [BorrowingIteratorProtocol Implementations](/documentation/Swift/BorrowingIteratorAdapter/BorrowingIteratorProtocol-Implementations) ## Relationships ### Conforms To [`BorrowingIteratorProtocol`](/documentation/Swift/BorrowingIteratorProtocol) --- 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)