# init(rebasing:) Creates a buffer over the same memory as the given buffer slice. ``` init(rebasing slice: Slice>) ``` ## Parameters `slice` The buffer slice to rebase. ## Discussion The new buffer represents the same region of memory as `slice`, but is indexed starting at zero instead of sharing indices with the original buffer. For example: ``` let buffer = returnsABuffer() let n = 5 let slice = buffer[n...] let rebased = UnsafeMutableBufferPointer(rebasing: slice) ``` After rebasing `slice` as the `rebased` buffer, the following are true: - `rebased.startIndex == 0` - `rebased[0] == slice[n]` - `rebased[0] == buffer[n]` - `rebased.count == slice.count` --- 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)