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# kCFTypeBagCallBacks

```
let kCFTypeBagCallBacks: CFBagCallBacks
```

## Discussion

Predefined [`CFBagCallBacks`](/documentation/CoreFoundation/CFBagCallBacks) structure containing a set of callbacks appropriate for use when the values in a CFBag 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.

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