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# NSHashTableOptions

Components in a bit-field to specify the behavior of elements in an [`NSHashTable`](/documentation/Foundation/NSHashTable) object.

```
typealias NSHashTableOptions = Int
```

## Topics

### Constants

[`NSHashTableStrongMemory`](/documentation/Foundation/NSHashTableStrongMemory)

Equal to [`strongMemory`](/documentation/Foundation/NSPointerFunctions/Options/strongMemory).

[`NSHashTableZeroingWeakMemory`](/documentation/Foundation/NSHashTableZeroingWeakMemory)

This option has been deprecated. Instead use the `NSHashTableWeakMemory` option. Equal to [`NSPointerFunctionsZeroingWeakMemory`](/documentation/Foundation/NSPointerFunctionsOptions/NSPointerFunctionsZeroingWeakMemory).

[`NSHashTableCopyIn`](/documentation/Foundation/NSHashTableCopyIn)

Equal to [`copyIn`](/documentation/Foundation/NSPointerFunctions/Options/copyIn).

[`NSHashTableObjectPointerPersonality`](/documentation/Foundation/NSHashTableObjectPointerPersonality)

Equal to [`objectPointerPersonality`](/documentation/Foundation/NSPointerFunctions/Options/objectPointerPersonality).

[`NSHashTableWeakMemory`](/documentation/Foundation/NSHashTableWeakMemory)

Equal to [`weakMemory`](/documentation/Foundation/NSPointerFunctions/Options/weakMemory). Uses weak read and write barriers appropriate for ARC or GC. Using [`weakMemory`](/documentation/Foundation/NSPointerFunctions/Options/weakMemory) object references will turn to `NULL` on last release.


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