---
title: "copyBytes(to:from:)"
framework: coremedia
role: symbol
role_heading: Instance Method
path: "coremedia/cmmutabledatablockbuffer/copybytes(to:from:)"
---

# copyBytes(to:from:)

Copy the bytes from the given range to the destination buffer.

## Declaration

```swift
func copyBytes<R>(to destination: UnsafeMutableRawBufferPointer, from range: R) where R : RangeExpression, R.Bound == Int
```