---
title: kCFTypeSetCallBacks
framework: corefoundation
role: symbol
role_heading: Global Variable
path: corefoundation/kcftypesetcallbacks
---

# kCFTypeSetCallBacks

## Declaration

```swift
let kCFTypeSetCallBacks: CFSetCallBacks
```

## Discussion

Discussion Predefined CFSetCallBacks structure containing a set of callbacks  appropriate for use when the values in a CFSet are all CFType-derived objects. The retain callback is CFRetain, the release callback is CFRelease, the copy callback is CFCopyDescription(_:), the equal callback is CFEqual(_:_:), and the hash callback is CFHash(_:). Therefore, if you use this constant when creating the collection, items are automatically retained when added to the collection, and released when removed from the collection.

## See Also

### Constants

- [kCFCopyStringSetCallBacks](corefoundation/kcfcopystringsetcallbacks.md)