---
title: kCFCopyStringSetCallBacks
framework: corefoundation
role: symbol
role_heading: Global Variable
path: corefoundation/kcfcopystringsetcallbacks
---

# kCFCopyStringSetCallBacks

Predefined CFSetCallBacks structure containing a set of callbacks  appropriate for use when the values in a set are all CFString objects. The retain callback makes an immutable copy of strings added to the set.

## Declaration

```swift
let kCFCopyStringSetCallBacks: CFSetCallBacks
```

## See Also

### Constants

- [kCFTypeSetCallBacks](corefoundation/kcftypesetcallbacks.md)