---
title: NSNonRetainedObjectMapKeyCallBacks
framework: foundation
role: symbol
role_heading: Global Variable
path: foundation/nsnonretainedobjectmapkeycallbacks
---

# NSNonRetainedObjectMapKeyCallBacks

For sets of objects, but without retaining/releasing.

## Declaration

```swift
let NSNonRetainedObjectMapKeyCallBacks: NSMapTableKeyCallBacks
```

## See Also

### Constants

- [NSIntegerMapKeyCallBacks](foundation/nsintegermapkeycallbacks.md)
- [NSIntMapKeyCallBacks](foundation/nsintmapkeycallbacks.md)
- [NSNonOwnedPointerMapKeyCallBacks](foundation/nsnonownedpointermapkeycallbacks.md)
- [NSNonOwnedPointerOrNullMapKeyCallBacks](foundation/nsnonownedpointerornullmapkeycallbacks.md)
- [NSObjectMapKeyCallBacks](foundation/nsobjectmapkeycallbacks.md)
- [NSOwnedPointerMapKeyCallBacks](foundation/nsownedpointermapkeycallbacks.md)