---
title: "copyBytes(to:from:)"
framework: dispatch
role: symbol
role_heading: Instance Method
path: "dispatch/dispatchdata/copybytes(to:from:)-7zz4y"
---

# copyBytes(to:from:)

## Declaration

```swift
func copyBytes<DestinationType>(to buffer: UnsafeMutableBufferPointer<DestinationType>, from range: Range<DispatchData.Index>? = nil) -> Int
```

## See Also

### Copying Bytes

- [copyBytes(to:count:)](dispatch/dispatchdata/copybytes(to:count:)-3j0qx.md)
- [copyBytes(to:from:)](dispatch/dispatchdata/copybytes(to:from:)-60yai.md)