---
title: MTLIOScratchBufferAllocator
framework: metal
role: symbol
role_heading: Protocol
path: metal/mtlioscratchbufferallocator
---

# MTLIOScratchBufferAllocator

A protocol your app implements to provide scratch memory to an input/output command queue.

## Declaration

```swift
protocol MTLIOScratchBufferAllocator : NSObjectProtocol
```

## Overview

Overview An allocator returns instances of MTLIOScratchBuffer, another type your app implements.

## Topics

### Providing scratch memory to a queue

- [makeScratchBuffer(minimumSize:)](metal/mtlioscratchbufferallocator/makescratchbuffer(minimumsize:).md)

## Relationships

### Inherits From

- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### I/O command queues

- [MTLIOCommandQueue](metal/mtliocommandqueue.md)
- [MTLIOCommandQueueDescriptor](metal/mtliocommandqueuedescriptor.md)
- [MTLIOPriority](metal/mtliopriority.md)
- [MTLIOCommandQueueType](metal/mtliocommandqueuetype.md)
- [MTLIOScratchBuffer](metal/mtlioscratchbuffer.md)