---
title: "subscript(_:)"
framework: metal
role: symbol
role_heading: Instance Subscript
path: "metal/mtlblitpasssamplebufferattachmentdescriptorarray/subscript(_:)"
---

# subscript(_:)

Accesses one of the array’s blit pass sample buffer attachment descriptor instances.

## Declaration

```swift
subscript(attachmentIndex: Int) -> MTLBlitPassSampleBufferAttachmentDescriptor! { get set }
```

## Parameters

- `attachmentIndex`: An index of one of the array’s doc://com.apple.metal/documentation/Metal/MTLBlitPassSampleBufferAttachmentDescriptor instances.