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# makeBuffer(bytesNoCopy:length:options:deallocator:)

Creates a buffer that wraps an existing contiguous memory allocation.

```
func makeBuffer(bytesNoCopy pointer: UnsafeMutableRawPointer, length: Int, options: MTLResourceOptions = [], deallocator: (@Sendable (UnsafeMutableRawPointer, Int) -> Void)? = nil) -> (any MTLBuffer)?
```

## Parameters

`pointer`

A page-aligned pointer to the starting memory address.

`length`

The size of the new buffer, in bytes, that results in a page-aligned region of memory.

`options`

An [`MTLResourceOptions`](/documentation/Metal/MTLResourceOptions) instance that sets the buffer’s storage and hazard-tracking modes. See [Resource fundamentals](/documentation/Metal/resource-fundamentals) and [Setting resource storage modes](/documentation/Metal/setting-resource-storage-modes) for more information.

`deallocator`

A block the framework invokes when it deallocates the buffer so that your app can release the underlying memory; otherwise `nil` to opt out.

## Return Value

A new [`MTLBuffer`](/documentation/Metal/MTLBuffer) instance if the method completes successfully; otherwise `nil`.

## Discussion> Important:
> The existing memory allocation needs to exist within a single virtual memory (VM) region.

---

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