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# Unity.Collections A C# collections library providing data structures that can be used in jobs, and optimized by Burst compiler. ### Package CI Summary [](https://badges.cds.internal.unity3d.com/packages/com.unity.collections/build-info?branch=master) [](https://badges.cds.internal.unity3d.com/packages/com.unity.collections/dependencies-info?branch=master) [](https://badges.cds.internal.unity3d.com/packages/com.unity.collections/dependants-info)   ## Documentation https://docs.unity3d.com/Packages/com.unity.collections@0.14/manual/index.html ## Data structures The Unity.Collections package includes the following data structures: Data structure | Description | Documentation ----------------------- | ----------- | ------------- `BitField32` | Fixed size 32-bit array of bits. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.BitField32.html) `BitField64` | Fixed size 64-bit array of bits. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.BitField64.html) `NativeBitArray` | Arbitrary sized array of bits. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeBitArray.html) `UnsafeBitArray` | Arbitrary sized array of bits, without any thread safety check features. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeBitArray.html) `NativeHashMap` | Unordered associative array, a collection of keys and values. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeHashMap-2.html) `UnsafeHashMap` | Unordered associative array, a collection of keys and values, without any thread safety check features. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeHashMap-2.html) `NativeHashSet` | Set of values. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeHashSet-1.html) `UnsafeHashSet` | Set of values, without any thread safety check features. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeHashSet-1.html) `NativeList` | An unmanaged, resizable list. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeList-1.html) `UnsafeList` | An unmanaged, resizable list, without any thread safety check features. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeList-1.html) `NativeMultiHashMap` | Unordered associative array, a collection of keys and values. This container can store multiple values for every key. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeMultiHashMap-2.html) `UnsafeMultiHashMap` | Unordered associative array, a collection of keys and values, without any thread safety check features. This container can store multiple values for every key. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeMultiHashMap-2.html) `NativeStream` | A deterministic data streaming supporting parallel reading and parallel writing. Allows you to write different types or arrays into a single stream. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeStream.html) `UnsafeStream` | A deterministic data streaming supporting parallel reading and parallel writings, without any thread safety check features. Allows you to write different types or arrays into a single stream. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeStream.html) `NativeReference` | An unmanaged, reference container. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.NativeReference-1.html) `UnsafeAppendBuffer` | An unmanaged, untyped, buffer, without any thread safety check features. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeAppendBuffer.html) `UnsafeRingQueue` | Fixed-size circular buffer, without any thread safety check features. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeRingQueue-1.html) `UnsafeAtomicCounter32` | 32-bit atomic counter. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeAtomicCounter32.html) `UnsafeAtomicCounter64` | 64-bit atomic counter. | [Documentation](https://docs.unity3d.com/Packages/com.unity.collections@0.14/api/Unity.Collections.LowLevel.Unsafe.UnsafeAtomicCounter64.html) [...](https://docs.unity3d.com/Packages/com.unity.collections@0.14/manual/index.html) The items in this package build upon the [NativeArray<T0>](https://docs.unity3d.com/ScriptReference/Unity.Collections.NativeArray_1), [NativeSlice<T0>](https://docs.unity3d.com/ScriptReference/Unity.Collections.NativeSlice_1), and other members of the Unity.Collections namespace, which Unity includes in the [core module](https://docs.unity3d.com/ScriptReference/UnityEngine.CoreModule). ## Notation `Native*` container prefix signifies that containers have debug safety mechanisms which will warn users when a container is used incorrectly in regard with thread-safety, or memory management. `Unsafe*` containers do not provide those safety warnings, and the user is fully responsible to guarantee that code will execute correctly. Almost all `Native*` containers are implemented by using `Unsafe*` container of the same kind internally. In the release build, since debug safety mechanism is disabled, there should not be any significant performance difference between `Unsafe*` and `Native*` containers. `Unsafe*` containers are in `Unity.Collections.LowLevel.Unsafe` namespace, while `Native*` containers are in `Unity.Collections` namespace. ## Determinism Populating containers from parallel jobs is never deterministic, except when using `NativeStream` or `UnsafeStream`. If determinism is required, consider sorting the container as a separate step or post-process it on a single thread. ## Known Issues All containers allocated with `Allocator.Temp` on the same thread use a shared `AtomicSafetyHandle` instance. This is problematic when using `NativeHashMap`, `NativeMultiHashMap`, `NativeHashSet` and `NativeList` together in situations where their secondary safety handle is used. This means that operations that invalidate an enumerator for either of these collections (or the `NativeArray` returned by `NativeList.AsArray`) will also invalidate all other previously acquired enumerators. For example, this will throw when safety checks are enabled: ``` var list = new NativeList<int>(Allocator.Temp); list.Add(1); // This array uses the secondary safety handle of the list, which is // shared between all Allocator.Temp allocations. var array = list.AsArray(); var list2 = new NativeHashSet<int>(Allocator.Temp); // This invalidates the secondary safety handle, which is also used // by the list above. list2.TryAdd(1); // This th