---
title: NSObjectMapKeyCallBacks
framework: foundation
role: symbol
role_heading: Global Variable
path: foundation/nsobjectmapkeycallbacks
---

# NSObjectMapKeyCallBacks

For keys that are objects.

## Declaration

```swift
let NSObjectMapKeyCallBacks: NSMapTableKeyCallBacks
```

## See Also

### Constants

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