---
title: "+=(_:_:)"
framework: coremedia
role: symbol
role_heading: Operator
path: "coremedia/cmmutabledatablockbuffer/+=(_:_:)"
---

# +=(_:_:)

Appends the bytes of another block buffer without copying.

## Declaration

```swift
static func += (lhs: inout CMMutableDataBlockBuffer, rhs: consuming CMMutableDataBlockBuffer)
```