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

Creates a new map table in the specified zone.

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

## Return Value

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

## 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`](/documentation/Foundation/NSMapTableKeyCallBacks) arguments are structures that are very similar to the callback structure used by [`NSCreateHashTable(_:_:)`](/documentation/Foundation/NSCreateHashTable(_:_:)); in fact, they have the same defaults as documented for that function.

## See Also

[`NSCopyMapTableWithZone(_:_:)`](/documentation/Foundation/NSCopyMapTableWithZone(_:_:))

Performs a shallow copy of the specified map table.

[`NSCreateMapTable(_:_:_:)`](/documentation/Foundation/NSCreateMapTable(_:_:_:))

Creates a new map table in the default zone.


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