---
title: kUCKeyOutputStateIndexMask
framework: coreservices
role: symbol
role_heading: Global Variable
path: coreservices/kuckeyoutputstateindexmask
---

# kUCKeyOutputStateIndexMask

If the bit specified by this mask is set, the UCKeyStateRecordsIndex UCKeyOutput value contains an index into a structure of type UCKeyStateRecordsIndex.

## Declaration

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