# UnsafeBitArray > An arbitrarily-sized array of bits. ## Definition * **Type:** Struct * **Namespace:** [Unity.Collections.LowLevel.Unsafe](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe.md) * **Assembly:** UnityEngine.ManagedKernelModule * **Implements:** [INativeDisposable](/engine/6000.7/script-reference/unity/collections/inativedisposable.md), [IDisposable](https://learn.microsoft.com/dotnet/api/system.idisposable) ```csharp public struct UnsafeBitArray : INativeDisposable, IDisposable ``` ## Remarks The number of allocated bytes is always a multiple of 8. For example, a 65-bit array could fit in 9 bytes, but its allocation is actually 16 bytes. ## Fields | Value | Description | | ---------------------------------------------------------------------------------------------------------- | ---------------------------- | | [Allocator](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/allocator.md) | The allocator to use. | | [Capacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/capacity.md) | The capacity number of bits. | | [Length](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/length.md) | The number of bits. | | [Ptr](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/ptr.md) | Pointer to the data. | ## Static Fields | Value | Description | | -------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- | | [MaxCapacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/maxcapacity.md) | The maximum number of elements this type of container can hold. | ## Constructors | Constructor | Description | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------- | | [UnsafeBitArray(System.Int32,Unity.Collections.AllocatorManager.AllocatorHandle,Unity.Collections.NativeArrayOptions)](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/ctor.md#unsafebitarray\(int-allocatorhandle-nativearrayoptions\)) | Initializes and returns an instance of UnsafeBitArray. | | [UnsafeBitArray(System.Void\*,System.Int32,Unity.Collections.AllocatorManager.AllocatorHandle)](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/ctor.md#unsafebitarray\(void*-int-allocatorhandle\)) | Initializes and returns an instance of UnsafeBitArray which aliases an existing buffer. | ## Properties | Property | Description | | ---------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------- | | [IsCreated](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/iscreated.md) | Whether this array has been allocated (and not yet deallocated). | | [IsEmpty](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/isempty.md) | Whether the container is empty. | ## Methods | Method | Description | | -------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [AsReadOnly](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/asreadonly.md) | Returns a readonly version of this UnsafeBitArray instance. | | [Clear](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/clear.md) | Sets all the bits to 0. | | [Copy](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/copy.md) | Copies a range of bits from this array to another range in this array. | | [CountBits](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/countbits.md) | Returns the number of bits in a range that are 1. | | [Dispose](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/dispose.md) | Releases all resources (memory and safety handles). | | [Find](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/find.md) | Find a sequence of N contiguous 0 bits in a bit array. To achieve higher performance, it is not guaranteed that the found index is necessarily the first occurrence of such a sequence. | | [GetBits](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/getbits.md) | Returns a ulong which has bits copied from this array. | | [IsSet](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/isset.md) | Returns true if the bit at an index is 1. | | [Resize](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/resize.md) | Sets the length, expanding the capacity if necessary. | | [Set](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/set.md) | Sets the bit at an index to 0 or 1. | | [SetBits](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/setbits.md) | Sets a range of bits to 0 or 1. | | [SetCapacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/setcapacity.md) | Sets the capacity. | | [TestAll](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/testall.md) | Returns true if all of the bits in a range are 1. | | [TestAny](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/testany.md) | Returns true if at least one of the bits in a range is 1. | | [TestNone](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/testnone.md) | Returns true if none of the bits in a range are 1 ("i.e." all bits in the range are 0). | | [TrimExcess](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/trimexcess.md) | Sets the capacity to match what it would be if it had been originally initialized with all its entries. | ## Static Methods | Method | Description | | ---------------------------------------------------------------------------------------------- | ----------------------------------- | | [Set](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/set.md) | Sets the bit at an index to 0 or 1. | ## Structs | Struct | Description | | ----------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------- | | [UnsafeBitArray.ReadOnly](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafebitarray/readonly.md) | A read-only alias for the value of a UnsafeBitArray. Does not have its own allocated storage. |