---
title: Predefined Callback Structures
framework: corefoundation
role: collectionGroup
role_heading: API Collection
path: corefoundation/cfbag-predefined-callback-structures
---

# Predefined Callback Structures

CFBag provides some predefined callbacks for your convenience.

## Topics

### Constants

- [kCFTypeBagCallBacks](corefoundation/kcftypebagcallbacks.md)
- [kCFCopyStringBagCallBacks](corefoundation/kcfcopystringbagcallbacks.md)