---
title: "NSCreateMapTableWithZone(_:_:_:_:)"
framework: foundation
role: symbol
role_heading: Function
path: "foundation/nscreatemaptablewithzone(_:_:_:_:)"
---

# NSCreateMapTableWithZone(_:_:_:_:)

Creates a new map table in the specified zone.

## Declaration

```swift
func NSCreateMapTableWithZone(_ keyCallBacks: NSMapTableKeyCallBacks, _ valueCallBacks: NSMapTableValueCallBacks, _ capacity: Int, _ zone: NSZone?) -> NSMapTable<AnyObject, AnyObject>
```

## Return Value

Return Value A new map table in allocated in zone. If zone is NULL, the hash table is created in the default zone.

## Discussion

Discussion The table’s size is dependent on (but generally not equal to) capacity. If capacity is 0, a small map table is created. The NSMapTableKeyCallBacks arguments are structures that are very similar to the callback structure used by NSCreateHashTable(_:_:); in fact, they have the same defaults as documented for that function.

## See Also

### Related Documentation

- [NSCopyMapTableWithZone(_:_:)](foundation/nscopymaptablewithzone(_:_:).md)
- [NSCreateMapTable(_:_:_:)](foundation/nscreatemaptable(_:_:_:).md)

### Functions

- [NSAllMapTableKeys(_:)](foundation/nsallmaptablekeys(_:).md)
- [NSAllMapTableValues(_:)](foundation/nsallmaptablevalues(_:).md)
- [NSCompareMapTables(_:_:)](foundation/nscomparemaptables(_:_:).md)
- [NSCopyMapTableWithZone(_:_:)](foundation/nscopymaptablewithzone(_:_:).md)
- [NSCountMapTable(_:)](foundation/nscountmaptable(_:).md)
- [NSCreateMapTable(_:_:_:)](foundation/nscreatemaptable(_:_:_:).md)
- [NSEndMapTableEnumeration(_:)](foundation/nsendmaptableenumeration(_:).md)
- [NSEnumerateMapTable(_:)](foundation/nsenumeratemaptable(_:).md)
- [NSFreeMapTable(_:)](foundation/nsfreemaptable(_:).md)
- [NSMapGet(_:_:)](foundation/nsmapget(_:_:).md)
- [NSMapInsert(_:_:_:)](foundation/nsmapinsert(_:_:_:).md)
- [NSMapInsertIfAbsent(_:_:_:)](foundation/nsmapinsertifabsent(_:_:_:).md)
- [NSMapInsertKnownAbsent(_:_:_:)](foundation/nsmapinsertknownabsent(_:_:_:).md)
- [NSMapMember(_:_:_:_:)](foundation/nsmapmember(_:_:_:_:).md)
- [NSMapRemove(_:_:)](foundation/nsmapremove(_:_:).md)