# ArchetypeChunk > A block of unmanaged memory containing the components for entities sharing the same ArchetypeChunk.Archetype. ## Definition * **Type:** Struct * **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md) * **Assembly:** UnityEngine.EntitiesModule * **Implements:** [IEquatable\](https://learn.microsoft.com/dotnet/api/system.iequatable-1) ```csharp public struct ArchetypeChunk : IEquatable ``` ## Properties | Property | Description | | ------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------- | | [Archetype](/engine/7000.0/script-reference/unity/entities/archetypechunk/archetype.md) | The archetype of the entities stored in this chunk. | | [Capacity](/engine/7000.0/script-reference/unity/entities/archetypechunk/capacity.md) | The number of entities that can fit in this chunk. | | [Count](/engine/7000.0/script-reference/unity/entities/archetypechunk/count.md) | Returns the number of entities in the chunk. | | [Full](/engine/7000.0/script-reference/unity/entities/archetypechunk/full.md) | Whether this chunk is exactly full. | | [SequenceNumber](/engine/7000.0/script-reference/unity/entities/archetypechunk/sequencenumber.md) | SequenceNumber is a unique number for each chunk, across all worlds. | ## Static Properties | Property | Description | | ----------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- | | [Null](/engine/7000.0/script-reference/unity/entities/archetypechunk/null.md) | A special "null" ArchetypeChunk that you can use to test whether ArchetypeChunk instances are valid. | ## Methods | Method | Description | | --------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [DidChange](/engine/7000.0/script-reference/unity/entities/archetypechunk/didchange.md) | Reports whether the data in any of IComponentData components in the chunk, of the type identified by `typeHandle`, could have changed since the specified version. | | [DidOrderChange](/engine/7000.0/script-reference/unity/entities/archetypechunk/didorderchange.md) | Reports whether a structural change has occured in this chunk since the specified version. | | [Equals](/engine/7000.0/script-reference/unity/entities/archetypechunk/equals.md) | Two ArchetypeChunk instances are equal if they reference the same block of chunk memory. | | [GetBufferAccessor](/engine/7000.0/script-reference/unity/entities/archetypechunk/getbufferaccessor.md) | Provides access to a chunk's array of component values for a specific buffer component type. | | [GetBufferAccessorRO](/engine/7000.0/script-reference/unity/entities/archetypechunk/getbufferaccessorro.md) | Provides read-only access to a chunk's array of component values for a specific buffer component type. | | [GetBufferAccessorRW](/engine/7000.0/script-reference/unity/entities/archetypechunk/getbufferaccessorrw.md) | Provides read/write access to a chunk's array of component values for a specific buffer component type. | | [GetChangeVersion](/engine/7000.0/script-reference/unity/entities/archetypechunk/getchangeversion.md) | Gets the change version number assigned to the specified type of component in this chunk. | | [GetChunkComponentData](/engine/7000.0/script-reference/unity/entities/archetypechunk/getchunkcomponentdata.md) | Gets the value of a chunk component. | | [GetChunkComponentDataRW](/engine/7000.0/script-reference/unity/entities/archetypechunk/getchunkcomponentdatarw.md) | Gets a reference to the value of a chunk component for read-write access. | | [GetComponentDataPtrRO](/engine/7000.0/script-reference/unity/entities/archetypechunk/getcomponentdataptrro.md) | Provides an unsafe read-only interface to components stored in this chunk. | | [GetComponentDataPtrRW](/engine/7000.0/script-reference/unity/entities/archetypechunk/getcomponentdataptrrw.md) | Provides an unsafe read/write interface to components stored in this chunk. | | [GetDynamicComponentDataArrayReinterpret](/engine/7000.0/script-reference/unity/entities/archetypechunk/getdynamiccomponentdataarrayreinterpret.md) | Construct a NativeArray view of a chunk's component data. | | [GetDynamicSharedComponentDataAddress](/engine/7000.0/script-reference/unity/entities/archetypechunk/getdynamicsharedcomponentdataaddress.md) | Provides an unsafe interface to shared components stored in this chunk. | | [GetEnableableBits](/engine/7000.0/script-reference/unity/entities/archetypechunk/getenableablebits.md) | Gets a copy of all the Enableable bits for the specified type handle. | | [GetEnabledMask](/engine/7000.0/script-reference/unity/entities/archetypechunk/getenabledmask.md) | Provides a [EnabledMask](/engine/7000.0/script-reference/unity/entities/enabledmask.md) to the component enabled bits in this chunk. | | [GetEntityDataPtrRO](/engine/7000.0/script-reference/unity/entities/archetypechunk/getentitydataptrro.md) | Provides an unsafe read-only interface to array of Entities stored in this chunk. | | [GetHashCode](/engine/7000.0/script-reference/unity/entities/archetypechunk/gethashcode.md) | Computes a hashcode to support hash-based collections. | | [GetNativeArray](/engine/7000.0/script-reference/unity/entities/archetypechunk/getnativearray.md) | Provides a native array interface to entity instances stored in this chunk. | | [GetOrderVersion](/engine/7000.0/script-reference/unity/entities/archetypechunk/getorderversion.md) | Gets the order version number assigned to this chunk. | | [GetRequiredComponentDataPtrRO](/engine/7000.0/script-reference/unity/entities/archetypechunk/getrequiredcomponentdataptrro.md) | Provides an unsafe read-only interface to components stored in this chunk. This variant assumes that the component is present in the chunk; use [ArchetypeChunk.GetComponentDataPtrRO](/engine/7000.0/script-reference/unity/entities/archetypechunk/getcomponentdataptrro.md) in cases where the caller can't guarantee this. | | [GetRequiredComponentDataPtrRW](/engine/7000.0/script-reference/unity/entities/archetypechunk/getrequiredcomponentdataptrrw.md) | Provides an unsafe read/write interface to components stored in this chunk. This variant assumes that the component is present in the chunk; use [ArchetypeChunk.GetComponentDataPtrRW](/engine/7000.0/script-reference/unity/entities/archetypechunk/getcomponentdataptrrw.md) in cases where the caller can't guarantee this. | | [GetSharedComponent](/engine/7000.0/script-reference/unity/entities/archetypechunk/getsharedcomponent.md) | Gets the current value of an unmanaged shared component. | | [GetSharedComponentDataBoxed](/engine/7000.0/script-reference/unity/entities/archetypechunk/getsharedcomponentdataboxed.md) | Gets the current value of a shared component. | | [GetSharedComponentIndex](/engine/7000.0/script-reference/unity/entities/archetypechunk/getsharedcomponentindex.md) | Gets the index into the array of unique values for the specified shared component. | | [GetTransformAccessor](/engine/7000.0/script-reference/unity/entities/archetypechunk/gettransformaccessor.md) | Gets an accessor for the transforms of the entities in this chunk. | | [GetUntypedBufferAccessor](/engine/7000.0/script-reference/unity/entities/archetypechunk/getuntypedbufferaccessor.md) | Give unsafe access to the buffers with type `chunkBufferTypeHandle` in the chunk. | | [GetUntypedBufferAccessorReinterpret](/engine/7000.0/script-reference/unity/entities/archetypechunk/getuntypedbufferaccessorreinterpret.md) | Construct a typed BufferAccessor view of a chunk's buffer component data from an untyped component handle. | | [Has](/engine/7000.0/script-reference/unity/entities/archetypechunk/has.md) | Reports whether this chunk contains the specified component type. | | [HasChunkComponent](/engine/7000.0/script-reference/unity/entities/archetypechunk/haschunkcomponent.md) | Reports whether this chunk contains a chunk component of the specified component type. | | [Invalid](/engine/7000.0/script-reference/unity/entities/archetypechunk/invalid.md) | Reports whether this ArchetypeChunk instance is invalid. | | [IsComponentEnabled](/engine/7000.0/script-reference/unity/entities/archetypechunk/iscomponentenabled.md) | Checks whether a given [IBufferElementData](/engine/7000.0/script-reference/unity/entities/ibufferelementdata.md) is enabled on the specified [Entity](/engine/7000.0/script-reference/unity/entities/entity.md). For the purposes of EntityQuery matching, an entity with a disabled component will behave as if it does not have that component. | | [NumSharedComponents](/engine/7000.0/script-reference/unity/entities/archetypechunk/numsharedcomponents.md) | The number of shared components in the archetype associated with this chunk. | | [SetChunkComponentData](/engine/7000.0/script-reference/unity/entities/archetypechunk/setchunkcomponentdata.md) | Sets the value of a chunk component. | | [SetComponentEnabled](/engine/7000.0/script-reference/unity/entities/archetypechunk/setcomponentenabled.md) | Enable or disable a [IComponentData](/engine/7000.0/script-reference/unity/entities/icomponentdata.md) on the specified [Entity](/engine/7000.0/script-reference/unity/entities/entity.md). This operation does not cause a structural change, or affect the value of the component. For the purposes of EntityQuery matching, an entity with a disabled component will behave as if it does not have that component. | | [SetComponentEnabledForAll](/engine/7000.0/script-reference/unity/entities/archetypechunk/setcomponentenabledforall.md) | Enable or disable a component on all entities in this chunk. | ## Operators | Operator | Description | | --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ | | [operator ==](/engine/7000.0/script-reference/unity/entities/archetypechunk/op-equality.md) | Two ArchetypeChunk instances are equal if they reference the same block of chunk and entity component store memory. | | [operator !=](/engine/7000.0/script-reference/unity/entities/archetypechunk/op-inequality.md) | Two ArchetypeChunk instances are only equal if they reference the same block of chunk and entity component store memory. |