# AccelerateMutableBuffer A type that represents a mutable buffer. ``` protocol AccelerateMutableBuffer : AccelerateBuffer ``` ## Overview If you implement your own type that conforms to [`AccelerateMutableBuffer`](/documentation/Accelerate/AccelerateMutableBuffer) and uses the default implementation of [`withUnsafeMutableBufferPointer(_:)`](/documentation/Accelerate/AccelerateMutableBuffer/withUnsafeMutableBufferPointer(_:)), your type needs to return a nonnil result from . ## Topics ### Instance Methods [`func withUnsafeMutableBufferPointer((inout UnsafeMutableBufferPointer) throws -> R) rethrows -> R`](/documentation/Accelerate/AccelerateMutableBuffer/withUnsafeMutableBufferPointer(_:)) Calls the given closure with a pointer to the object’s mutable contiguous storage. [`func withUnsafePixelBuffer(body: (vImage.PixelBuffer) throws -> R) rethrows -> R`](/documentation/Accelerate/AccelerateMutableBuffer/withUnsafePixelBuffer(body:)-3k58x) [`func withUnsafePixelBuffer(body: (vImage.PixelBuffer) throws -> R) rethrows -> R`](/documentation/Accelerate/AccelerateMutableBuffer/withUnsafePixelBuffer(body:)-5n3lj) [`func withUnsafePixelBuffer(body: (vImage.PixelBuffer) throws -> R) rethrows -> R`](/documentation/Accelerate/AccelerateMutableBuffer/withUnsafePixelBuffer(body:)-9vr8y) [`func withUnsafePixelBuffer(body: (vImage.PixelBuffer) throws -> R) rethrows -> R`](/documentation/Accelerate/AccelerateMutableBuffer/withUnsafePixelBuffer(body:)-aa26) ## Relationships ### Inherits From [`AccelerateBuffer`](/documentation/Accelerate/AccelerateBuffer) ### Conforming Types [`PixelBuffer`](/documentation/Accelerate/vImage/PixelBuffer) --- 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)