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# Memory Allocation Options

Constants used to control behavior when allocating or reallocating collectible memory.

## Discussion

These constants are used as components in a bitfield to specify the behavior of [`NSAllocateCollectable`](/documentation/Foundation/NSAllocateCollectable) and [`NSReallocateCollectable`](/documentation/Foundation/NSReallocateCollectable).

## Topics

### Constants

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

Specifies allocation of scanned memory.

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

Specifies that the block is retained, and therefore ineligible for collection. Specifying this option is equivalent to invoking [`disableCollectorForPointer:`](/documentation/Foundation/NSGarbageCollector/disableCollectorForPointer:) with the returned block as the argument.


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