---
title: kUCKeyOutputTestForIndexMask
framework: coreservices
role: symbol
role_heading: Global Variable
path: coreservices/kuckeyoutputtestforindexmask
---

# kUCKeyOutputTestForIndexMask

## Declaration

```swift
var kUCKeyOutputTestForIndexMask: Int { get }
```

## Discussion

Discussion You can use this mask to test the bits (14–15) in the UCKeyOutput value that determine whether the value contains an index to any other structure. If both bits specified by this mask are clear, the UCKeyOutput value does not contain an index to any other structure.