# UnsafeList > An unmanaged, resizable list. ## 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), [INativeList\](/engine/6000.7/script-reference/unity/collections/inativelist1.md), [IIndexable\](/engine/6000.7/script-reference/unity/collections/iindexable1.md), [IEnumerable\](https://learn.microsoft.com/dotnet/api/system.collections.generic.ienumerable-1), [IEnumerable](https://learn.microsoft.com/dotnet/api/system.collections.ienumerable) ```csharp public struct UnsafeList : INativeDisposable, IDisposable, INativeList, IIndexable, IEnumerable, IEnumerable where T : unmanaged ``` ## Fields | Value | Description | | ---------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------- | | [Allocator](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/allocator.md) | The allocator used to create the internal buffer. | | [m\_capacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/m-capacity.md) | The number of elements that can fit in the internal buffer. | | [m\_length](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/m-length.md) | The number of elements. | | [Ptr](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/ptr.md) | The internal buffer of this list. | ## Static Fields | Value | Description | | ----------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- | | [MaxCapacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/maxcapacity.md) | The maximum number of elements this type of container can hold. | ## Constructors | Constructor | Description | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- | | [UnsafeList\`1(\`0\*,System.Int32)](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/ctor.md#unsafelist\(0*-int\)) | Initializes and returns an instance of UnsafeList. | | [UnsafeList\`1(System.Int32,Unity.Collections.AllocatorManager.AllocatorHandle,Unity.Collections.NativeArrayOptions)](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/ctor.md#unsafelist\(int-allocatorhandle-nativearrayoptions\)) | Initializes and returns an instance of UnsafeList. | ## Properties | Property | Description | | ------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------- | | [Capacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/capacity.md) | The number of elements that can fit in the internal buffer. | | [IsCreated](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/iscreated.md) | Whether this list has been allocated (and not yet deallocated). | | [IsEmpty](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/isempty.md) | Whether the list is empty. | | [this\[\]](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/item.md) | The element at an index. | | [Length](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/length.md) | The number of elements. | ## Methods | Method | Description | | ----------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------- | | [Add](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/add.md) | Adds an element to the end of the list. | | [AddNoResize](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/addnoresize.md) | Adds an element to the end of this list. | | [AddRange](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/addrange.md) | Copies elements from a ReadOnlySpan to the end of this list. | | [AddRangeNoResize](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/addrangenoresize.md) | Copies elements from a ReadOnlySpan to the end of this list. | | [AddReplicate](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/addreplicate.md) | Appends value count times to the end of this list. | | [AsParallelReader](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/asparallelreader.md) | **Obsolete.** Use [UnsafeList\.AsReadOnly](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/asreadonly.md) instead. | | [AsParallelWriter](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/asparallelwriter.md) | Returns a parallel writer of this list. | | [AsReadOnly](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/asreadonly.md) | Returns a read only of this list. | | [AsReadOnlySpan](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/asreadonlyspan.md) | Returns ReadOnlySpan\\\ view of this container. | | [AsSpan](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/asspan.md) | Returns Span\\\ view of this container. | | [Clear](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/clear.md) | Sets the length to 0. | | [CopyFrom](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/copyfrom.md) | Copies all elements of specified container to this container. | | [Dispose](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/dispose.md) | Releases all resources (memory). | | [ElementAt](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/elementat.md) | Returns a reference to the element at a given index. | | [GetEnumerator](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/getenumerator.md) | Returns an enumerator over the elements of the list. | | [GetUnsafePtr](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/getunsafeptr.md) | Get a pointer to the data. | | [GetUnsafeReadOnlyPtr](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/getunsafereadonlyptr.md) | Get a pointer to the data. | | [InsertRange](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/insertrange.md) | Shifts elements toward the end of this list, increasing its length. | | [InsertRangeWithBeginEnd](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/insertrangewithbeginend.md) | Shifts elements toward the end of this list, increasing its length. | | [RemoveAt](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/removeat.md) | Removes the element at an index, shifting everything above it down by one. Decrements the length by 1. | | [RemoveAtSwapBack](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/removeatswapback.md) | Copies the last element of this list to the specified index. Decrements the length by 1. | | [RemoveRange](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/removerange.md) | Removes "N" elements in a range, shifting everything above the range down by "N". Decrements the length by "N". | | [RemoveRangeSwapBack](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/removerangeswapback.md) | Copies the last "N" elements of this list to a range in this list. Decrements the length by "N". | | [Resize](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/resize.md) | Sets the length, expanding the capacity if necessary. | | [SetCapacity](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/setcapacity.md) | Sets the capacity. | | [TrimExcess](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/trimexcess.md) | Sets the capacity to match the length. | ## Static Methods | Method | Description | | --------------------------------------------------------------------------------------------------- | ------------------- | | [Create](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/create.md) | Returns a new list. | | [Destroy](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/destroy.md) | Destroys the list. | ## Structs | Struct | Description | | -------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------- | | [UnsafeList\.Enumerator](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/enumerator.md) | An enumerator over the elements of a list. | | [UnsafeList\.ParallelReader](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/parallelreader.md) | **Obsolete.** Use [UnsafeList\.ReadOnly](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/readonly.md) instead. | | [UnsafeList\.ParallelWriter](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/parallelwriter.md) | A parallel writer for an UnsafeList\\\. | | [UnsafeList\.ReadOnly](/engine/6000.7/script-reference/unity/collections/lowlevel/unsafe/unsafelist1/readonly.md) | A read only for an UnsafeList\\\. |