---
title: "withUnsafeMutableBufferPointer(_:)"
framework: accelerate
role: symbol
role_heading: Instance Method
path: "accelerate/acceleratemutablematrixbuffer/withunsafemutablebufferpointer(_:)"
---

# withUnsafeMutableBufferPointer(_:)

## Declaration

```swift
mutating func withUnsafeMutableBufferPointer<R>(_ body: (inout UnsafeMutableBufferPointer<Self.Element>) throws -> R) rethrows -> R
```