# copyBytes(to:from:) Copy the bytes from the given range to the destination buffer. ``` func copyBytes(to destination: UnsafeMutableRawBufferPointer, from range: R) where R : RangeExpression, R.Bound == Int ``` --- 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)