Struct ArchetypeChunk

A block of unmanaged memory containing the components for entities sharing the same Unity.Entities.Archetype.

Namespace: Unity.Entities

Syntax

public struct ArchetypeChunk : IEquatable<ArchetypeChunk>

Properties

Archetype

The archetype of the entities stored in this chunk.

Declaration

public EntityArchetype Archetype { get; }

Property Value

Type	Description
EntityArchetype

Remarks

All entities in a chunk must have the same Unity.Entities.Archetype.

Capacity

The number of entities that can fit in this chunk.

Declaration

public int Capacity { get; }

Property Value

Type	Description
Int32

Remarks

The capacity of a chunk depends on the size of the components making up the Unity.Entities.Archetype of the entities stored in the chunk.

Count

The number of entities currently stored in the chunk.

Declaration

public int Count { get; }

Property Value

Type	Description
Int32

Full

Whether this chunk is exactly full.

Declaration

public bool Full { get; }

Property Value

Type	Description
Boolean

Null

A special "null" ArchetypeChunk that you can use to test whether ArchetypeChunk instances are valid.

Declaration

public static ArchetypeChunk Null { get; }

Property Value

Type	Description
ArchetypeChunk

Remarks

An ArchetypeChunk struct that refers to a chunk of memory that has been freed will be equal to this "null" ArchetypeChunk instance.

Methods

DidChange<T>(ArchetypeChunkBufferType<T>, UInt32)

Reports whether any of dynamic buffer components in the chunk, of the type identified by chunkBufferType, could have changed.

Declaration

public bool DidChange<T>(ArchetypeChunkBufferType<T> chunkBufferType, uint version)
    where T : struct, IBufferElementData

Parameters

Type	Name	Description
ArchetypeChunkBufferType<T>	chunkBufferType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.
UInt32	version	The version to compare. In a system, this parameter should be set to the current LastSystemVersion at the time the job is run or scheduled.

Returns

Type	Description
Boolean	True, if the version number stored in the chunk for this component is more recent than the version passed to the `version` parameter.

Type Parameters

Name	Description
T	The data type of the elements in the dynamic buffer.

Remarks

Note that for efficiency, the change version applies to whole chunks not individual entities. The change version is incremented even when another job or system that has declared write access to a component does not actually change the component value.

DidChange<T>(ArchetypeChunkComponentType<T>, UInt32)

Reports whether any of IComponentData components in the chunk, of the type identified by chunkComponentType, could have changed.

Declaration

public bool DidChange<T>(ArchetypeChunkComponentType<T> chunkComponentType, uint version)
    where T : IComponentData

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.
UInt32	version	The version to compare. In a system, this parameter should be set to the current LastSystemVersion at the time the job is run or scheduled.

Returns

Type	Description
Boolean	True, if the version number stored in the chunk for this component is more recent than the version passed to the `version` parameter.

Type Parameters

Name	Description
T	The component type.

Remarks

DidChange<T>(ArchetypeChunkSharedComponentType<T>, UInt32)

Declaration

public bool DidChange<T>(ArchetypeChunkSharedComponentType<T> chunkSharedComponentData, uint version)
    where T : struct, ISharedComponentData

Parameters

Type	Name	Description
ArchetypeChunkSharedComponentType<T>	chunkSharedComponentData
UInt32	version

Returns

Type	Description
Boolean

Type Parameters

Name	Description
T

Equals(Object)

Two ArchetypeChunk instances are equal if they reference the same block of chunk memory.

Declaration

public override bool Equals(object compare)

Parameters

Type	Name	Description
Object	compare	An object

Returns

Type	Description
Boolean	True if `compare` is an `ArchetypeChunk` instance that references the same memory, or both contain null memory references; otherwise false.

Overrides

ValueType.Equals(Object)

Equals(ArchetypeChunk)

Two ArchetypeChunk instances are equal if they reference the same block of chunk memory.

Declaration

public bool Equals(ArchetypeChunk archetypeChunk)

Parameters

Type	Name	Description
ArchetypeChunk	archetypeChunk	Another ArchetypeChunk instance

Returns

Type	Description
Boolean	True, if both ArchetypeChunk instances reference the same memory or both contain null memory references.

GetBufferAccessor<T>(ArchetypeChunkBufferType<T>)

Declaration

public BufferAccessor<T> GetBufferAccessor<T>(ArchetypeChunkBufferType<T> bufferComponentType)
    where T : struct, IBufferElementData

Parameters

Type	Name	Description
ArchetypeChunkBufferType<T>	bufferComponentType

Returns

Type	Description
BufferAccessor<T>

Type Parameters

Name	Description
T

GetChunkComponentData<T>(ArchetypeChunkComponentType<T>)

Declaration

public T GetChunkComponentData<T>(ArchetypeChunkComponentType<T> chunkComponentType)
    where T : struct

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType

Returns

Type	Description
T

Type Parameters

Name	Description
T

GetComponentObjects<T>(ArchetypeChunkComponentType<T>, EntityManager)

Declaration

public ArchetypeChunkComponentObjects<T> GetComponentObjects<T>(ArchetypeChunkComponentType<T> componentType, EntityManager manager)
    where T : class

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	componentType
EntityManager	manager

Returns

Type	Description
ArchetypeChunkComponentObjects<T>

Type Parameters

Name	Description
T

GetComponentVersion<T>(ArchetypeChunkBufferType<T>)

Declaration

public uint GetComponentVersion<T>(ArchetypeChunkBufferType<T> chunkBufferType)
    where T : struct, IBufferElementData

Parameters

Type	Name	Description
ArchetypeChunkBufferType<T>	chunkBufferType

Returns

Type	Description
UInt32

Type Parameters

Name	Description
T

GetComponentVersion<T>(ArchetypeChunkComponentType<T>)

Declaration

public uint GetComponentVersion<T>(ArchetypeChunkComponentType<T> chunkComponentType)
    where T : IComponentData

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType

Returns

Type	Description
UInt32

Type Parameters

Name	Description
T

GetComponentVersion<T>(ArchetypeChunkSharedComponentType<T>)

Declaration

public uint GetComponentVersion<T>(ArchetypeChunkSharedComponentType<T> chunkSharedComponentData)
    where T : struct, ISharedComponentData

Parameters

Type	Name	Description
ArchetypeChunkSharedComponentType<T>	chunkSharedComponentData

Returns

Type	Description
UInt32

Type Parameters

Name	Description
T

GetDynamicComponentDataArrayReinterpret<T>(ArchetypeChunkComponentTypeDynamic, Int32)

Declaration

public NativeArray<T> GetDynamicComponentDataArrayReinterpret<T>(ArchetypeChunkComponentTypeDynamic chunkComponentType, int expectedTypeSize)
    where T : struct

Parameters

Type	Name	Description
ArchetypeChunkComponentTypeDynamic	chunkComponentType
Int32	expectedTypeSize

Returns

Type	Description
NativeArray<T>

Type Parameters

Name	Description
T

Exceptions

Type	Condition
ArgumentException
InvalidOperationException

GetHashCode()

Computes a hashcode to support hash-based collections.

Declaration

public override int GetHashCode()

Returns

Type	Description
Int32	The computed hash.

Overrides

ValueType.GetHashCode()

GetNativeArray(ArchetypeChunkEntityType)

Provides a native array interface to entity instances stored in this chunk.

Declaration

public NativeArray<Entity> GetNativeArray(ArchetypeChunkEntityType archetypeChunkEntityType)

Parameters

Type	Name	Description
ArchetypeChunkEntityType	archetypeChunkEntityType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.

Returns

Type	Description
NativeArray<Entity>	A native array containing the entities in the chunk.

Remarks

The native array returned by this method references existing data, not a copy.

GetNativeArray<T>(ArchetypeChunkComponentType<T>)

Provides a native array interface to components stored in this chunk.

Declaration

public NativeArray<T> GetNativeArray<T>(ArchetypeChunkComponentType<T> chunkComponentType)
    where T : struct, IComponentData

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.

Returns

Type	Description
NativeArray<T>	A native array containing the components in the chunk.

Type Parameters

Name	Description
T	The data type of the component.

Remarks

The native array returned by this method references existing data, not a copy.

Exceptions

Type	Condition
ArgumentException	If you call this function on a "tag" component type (which is an empty component with no fields).

GetSharedComponentData<T>(ArchetypeChunkSharedComponentType<T>, EntityManager)

Declaration

public T GetSharedComponentData<T>(ArchetypeChunkSharedComponentType<T> chunkSharedComponentData, EntityManager entityManager)
    where T : struct, ISharedComponentData

Parameters

Type	Name	Description
ArchetypeChunkSharedComponentType<T>	chunkSharedComponentData
EntityManager	entityManager

Returns

Type	Description
T

Type Parameters

Name	Description
T

GetSharedComponentIndex<T>(ArchetypeChunkSharedComponentType<T>)

Declaration

public int GetSharedComponentIndex<T>(ArchetypeChunkSharedComponentType<T> chunkSharedComponentData)
    where T : struct, ISharedComponentData

Parameters

Type	Name	Description
ArchetypeChunkSharedComponentType<T>	chunkSharedComponentData

Returns

Type	Description
Int32

Type Parameters

Name	Description
T

Has(ArchetypeChunkComponentTypeDynamic)

Declaration

public bool Has(ArchetypeChunkComponentTypeDynamic chunkComponentType)

Parameters

Type	Name	Description
ArchetypeChunkComponentTypeDynamic	chunkComponentType

Returns

Type	Description
Boolean

Has<T>(ArchetypeChunkBufferType<T>)

Reports whether this chunk contains a dynamic buffer containing the specified component type.

Declaration

public bool Has<T>(ArchetypeChunkBufferType<T> chunkBufferType)
    where T : struct, IBufferElementData

Parameters

Type	Name	Description
ArchetypeChunkBufferType<T>	chunkBufferType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.

Returns

Type	Description
Boolean	True, if this chunk contains an array of the dynamic buffers containing the specified component type.

Type Parameters

Name	Description
T	The data type of the component stored in the dynamic buffer.

Remarks

When an EntityQuery includes optional dynamic buffer types (with Any), some chunks returned by the query may have these dynamic buffers components and some may not. Use this function to determine whether or not the current chunk contains one of these optional dynamic buffers.

Has<T>(ArchetypeChunkComponentType<T>)

Reports whether this chunk contains the specified component type.

Declaration

public bool Has<T>(ArchetypeChunkComponentType<T> chunkComponentType)
    where T : IComponentData

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.

Returns

Type	Description
Boolean	True, if this chunk contains an array of the specified component type.

Type Parameters

Name	Description
T	The data type of the component.

Remarks

When an EntityQuery includes optional components (using Any), some chunks returned by the query may contain such components and some may not. Use this function to determine whether or not the current chunk contains one of these optional component types.

Has<T>(ArchetypeChunkSharedComponentType<T>)

Reports whether this chunk contains a shared component of the specified component type.

Declaration

public bool Has<T>(ArchetypeChunkSharedComponentType<T> chunkComponentType)
    where T : struct, ISharedComponentData

Parameters

Type	Name	Description
ArchetypeChunkSharedComponentType<T>	chunkComponentType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.

Returns

Type	Description
Boolean	True, if this chunk contains a shared component of the specified type.

Type Parameters

Name	Description
T	The data type of the shared component.

Remarks

When an EntityQuery includes optional components used as shared components (with Any), some chunks returned by the query may have these shared components and some may not. Use this function to determine whether or not the current chunk contains one of these optional component types as a shared component.

HasChunkComponent<T>(ArchetypeChunkComponentType<T>)

Reports whether this chunk contains a chunk component of the specified component type.

Declaration

public bool HasChunkComponent<T>(ArchetypeChunkComponentType<T> chunkComponentType)
    where T : struct, IComponentData

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType	An object containing type and job safety information. Create this object by calling immediately before scheduling a job. Pass the object to a job using a public field you define as part of the job struct.

Returns

Type	Description
Boolean	True, if this chunk contains a chunk component of the specified type.

Type Parameters

Name	Description
T	The data type of the chunk component.

Remarks

When an EntityQuery includes optional components used as chunk components (with Any), some chunks returned by the query may have these chunk components and some may not. Use this function to determine whether or not the current chunk contains one of these optional component types as a chunk component.

Invalid()

Reports whether this ArchetypeChunk instance is invalid.

Declaration

public bool Invalid()

Returns

Type	Description
Boolean	True, if no Unity.Entities.Archetype is associated with the this ArchetypeChunk instance.

Locked()

Reports whether this ArchetypeChunk is locked.

Declaration

public bool Locked()

Returns

Type	Description
Boolean	True, if locked.

NumSharedComponents()

The number of shared components in the archetype associated with this chunk.

Declaration

public int NumSharedComponents()

Returns

Type	Description
Int32	The shared component count.

SetChunkComponentData<T>(ArchetypeChunkComponentType<T>, T)

Declaration

public void SetChunkComponentData<T>(ArchetypeChunkComponentType<T> chunkComponentType, T value)
    where T : struct

Parameters

Type	Name	Description
ArchetypeChunkComponentType<T>	chunkComponentType
T	value

Type Parameters

Name	Description
T

Operators

Equality(ArchetypeChunk, ArchetypeChunk)

Two ArchetypeChunk instances are equal if they reference the same block of chunk memory.

Declaration

public static bool operator ==(ArchetypeChunk lhs, ArchetypeChunk rhs)

Parameters

Type	Name	Description
ArchetypeChunk	lhs	An ArchetypeChunk
ArchetypeChunk	rhs	Another ArchetypeChunk

Returns

Type	Description
Boolean	True, if both ArchetypeChunk instances reference the same memory, or both contain null memory references.

Inequality(ArchetypeChunk, ArchetypeChunk)

Two ArchetypeChunk instances are only equal if they reference the same block of chunk memory.

Declaration

public static bool operator !=(ArchetypeChunk lhs, ArchetypeChunk rhs)

Parameters

Type	Name	Description
ArchetypeChunk	lhs	An ArchetypeChunk
ArchetypeChunk	rhs	Another ArchetypeChunk

Returns

Type	Description
Boolean	True, if the ArchetypeChunk instances reference different blocks of memory.