Enhance memory management and performance benchmarks

Added a new configuration setting in `.editorconfig` to sort system directives last and increased the maximum line length to 400 characters.
Added a new static class `MathUtilities` in `MathUtilities.cs` with a method `CeilPow2` for computing powers of two.
Added a new benchmark class `CollectionBenchmark` in `CollectionBenchmark.cs` to measure performance of standard versus unsafe arrays.
Added a new benchmark class `HashCodeBenchmark` in `HashCodeBenchmark.cs` to evaluate hash code generation performance.
Added new utility methods in `UnsafeUtilities.cs` for memory allocation and deallocation, including `Malloc`, `AlignedAlloc`, `Realloc`, and `Free`.
Added a new `AllocationType` enum in `AllocationType.cs` to specify memory allocation types.

Changed the project file `Misaki.HighPerformance.Mathematics.csproj` to target .NET 9.0 and enable implicit usings and nullable reference types.
Changed the `ParallelNoiseBenchmark` class in `ParallelNoiseBenchmark.cs` to improve memory allocation strategies and performance.
Changed memory management in `Arena.cs` and `DynamicArena.cs` to use custom `Malloc` and `Free` functions.
Changed the `IUnsafeCollection` interface in `IUnsafeCollection.cs` to include new methods for resizing collections and obtaining unsafe pointers.
Changed the `UnsafeArray.cs` to improve management of unsafe arrays, including constructor and method updates.
Changed the `UnsafeHashMap` and `UnsafeHashSet` classes to enhance performance and memory management.
Changed the `UnsafeCollectionExtensions` class to provide additional methods for copying elements and converting collections.
Changed the `ObjectPool` class in `ObjectPool.cs` to simplify cleanup and remove auto-cleanup functionality.
Changed job scheduling and worker classes in `JobExtensions.cs` and `JobWorker.cs` to improve job scheduling in a thread pool.

Removed commented-out code in `Program.cs` related to previous testing methods.
Removed auto-cleanup functionality from the `ObjectPool` class.

.editorconfig

@@ -0,0 +1,2 @@
+dotnet_sort_system_directives_first = false
+max_line_length = 400

Misaki.HighPerformance.Math/MathUtilities.cs

@@ -0,0 +1,19 @@
+using System.Runtime.CompilerServices;
+
+namespace Misaki.HighPerformance.Mathematics;
+
+public static class MathUtilities
+{
+    /// <summary>Returns the smallest power of two that is greater than or equal to the specified number.</summary>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static int CeilPow2(int x)
+    {
+        x -= 1;
+        x |= x >> 1;
+        x |= x >> 2;
+        x |= x >> 4;
+        x |= x >> 8;
+        x |= x >> 16;
+        return x + 1;
+    }
+}

Misaki.HighPerformance.Math/Misaki.HighPerformance.Mathematics.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

Misaki.HighPerformance.Test/CollectionBenchmark.cs

@@ -0,0 +1,41 @@
+using BenchmarkDotNet.Attributes;
+using Misaki.HighPerformance.Unsafe.Collections;
+using Misaki.HighPerformance.Unsafe.Collections.Services;
+
+namespace Misaki.HighPerformance.Test;
+
+[MemoryDiagnoser]
+public class CollectionBenchmark
+{
+    [Params(10, 100, 1000)]
+    public int count = 100;
+
+    [Benchmark]
+    public void Array()
+    {
+        for (var i = 0; i < count; i++)
+        {
+            var array = new int[count];
+        }
+    }
+
+    [Benchmark]
+    public void UnsafeArray()
+    {
+        for (var i = 0; i < count; i++)
+        {
+            var array = new UnsafeArray<int>(count, Allocator.Temp);
+            for (var j = 0; j < count; j++)
+            {
+                array[j] = j;
+            }
+
+            foreach (var item in array)
+            {
+                Console.WriteLine(item);
+            }
+
+            AllocationManager.Reset();
+        }
+    }
+}

Misaki.HighPerformance.Test/HashCodeBenchmark.cs

@@ -0,0 +1,95 @@
+using BenchmarkDotNet.Attributes;
+using System.Numerics;
+
+namespace Misaki.HighPerformance.Test;
+
+public class HashCodeBenchmark
+{
+    private struct Component
+    {
+        public int Value;
+        public int Value2;
+        public float Value3;
+        public Guid Value4;
+        public Matrix4x4 Value5;
+        public Vector4 Value6;
+    }
+
+    [Params(100, 1000, 10000)]
+    public int count;
+
+    private Component _component = new Component()
+    {
+        Value = 0,
+        Value2 = 1,
+        Value3 = 2,
+        Value4 = Guid.NewGuid(),
+        Value5 = Matrix4x4.Identity,
+        Value6 = Vector4.One
+    };
+
+    private Dictionary<Type, int> _hashCache = new();
+    //private UnsafeHashMap<Guid, int> _hashMap = new(16);
+
+    private bool _disposed;
+
+    //~HashCodeBenchmark()
+    //{
+    //    Dispose();
+    //}
+
+    [Benchmark]
+    public void Hash()
+    {
+        for (var i = 0; i < count; i++)
+        {
+            _ = _component.GetHashCode();
+        }
+    }
+
+    [Benchmark]
+    public void HashWithCache()
+    {
+        for (var i = 0; i < count; i++)
+        {
+            var type = typeof(Component);
+            if (!_hashCache.TryGetValue(type, out var hash))
+            {
+                hash = type.GetHashCode();
+                _hashCache[type] = hash;
+            }
+
+            _ = hash;
+        }
+    }
+
+    //[Benchmark]
+    //public void HashWithUnsafeHashMap()
+    //{
+    //    for (var i = 0; i < count; i++)
+    //    {
+    //        var type = _component.GetType();
+    //        var guid = type.GUID;
+    //        if (!_hashMap.TryGetValue(guid, out var hash))
+    //        {
+    //            hash = type.GetHashCode();
+    //            _hashMap.Add(guid, hash);
+    //            _hashMap.Test(ref _hashMap._hashMap);
+    //        }
+
+    //        _ = hash;
+    //    }
+    //}
+
+    //public void Dispose()
+    //{
+    //    if (_disposed)
+    //    {
+    //        return;
+    //    }
+
+    //    _hashMap.Dispose();
+
+    //    GC.SuppressFinalize(this);
+    //}
+}

Misaki.HighPerformance.Test/Misaki.HighPerformance.Test.csproj

@@ -6,6 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <PublishAot>True</PublishAot>
+    <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
   </PropertyGroup>
 
   <ItemGroup>

Misaki.HighPerformance.Test/ParallelNoiseBenchmark.cs

@@ -21,12 +21,6 @@ public class ParallelNoiseBenchmark
             return x - MathF.Truncate(x);
         }
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        private static float Lerp(float a, float b, float t)
-        {
-            return a + t * (b - a);
-        }
-
         private static Vector2 GradientNoiseDirect(Vector2 uv)
         {
             uv.X %= 289;
@@ -48,7 +42,7 @@ public class ParallelNoiseBenchmark
             var d11 = Vector2.Dot(GradientNoiseDirect(ip + new Vector2(1, 1)), fp - new Vector2(1, 1));
 
             fp = fp * fp * fp * (fp * (fp * new Vector2(6.0f) - new Vector2(15.0f)) + new Vector2(10.0f));
-            return Lerp(Lerp(d00, d10, fp.Y), Lerp(d01, d11, fp.Y), fp.X);
+            return float.Lerp(float.Lerp(d00, d10, fp.Y), float.Lerp(d01, d11, fp.Y), fp.X);
         }
 
         public void Execute(int index)
@@ -65,9 +59,9 @@ public class ParallelNoiseBenchmark
     private const int _LENGTH = _WIDTH * _HEIGHT;
 
     [Benchmark]
-    public void JobSystem()
+    public static void JobSystem()
     {
-        using var buffers = new UnsafeArray<float>(_LENGTH, AllocationType.UnInitialized);
+        using var buffers = new UnsafeArray<float>(_LENGTH, Allocator.Persistent, AllocationType.UnInitialized);
         var job = new NoiseJob()
         {
             buffers = buffers,
@@ -80,9 +74,9 @@ public class ParallelNoiseBenchmark
     }
 
     [Benchmark]
-    public void ParallelFor()
+    public static void ParallelFor()
     {
-        using var buffers = new UnsafeArray<float>(_LENGTH, AllocationType.UnInitialized);
+        using var buffers = new UnsafeArray<float>(_LENGTH, Allocator.Persistent, AllocationType.UnInitialized);
 
         Parallel.For(0, _LENGTH, i =>
         {
@@ -94,9 +88,9 @@ public class ParallelNoiseBenchmark
     }
 
     [Benchmark]
-    public void For()
+    public static void For()
     {
-        using var buffers = new UnsafeArray<float>(_LENGTH, AllocationType.UnInitialized);
+        using var buffers = new UnsafeArray<float>(_LENGTH, Allocator.Persistent, AllocationType.UnInitialized);
         for (var i = 0; i < _LENGTH; i++)
         {
             var x = i % _WIDTH;

Misaki.HighPerformance.Test/Program.cs

@@ -1,37 +1,7 @@
-//using BenchmarkDotNet.Running;
+using Misaki.HighPerformance.Test;
-//using Misaki.HighPerformance.Test;
+using Misaki.HighPerformance.Unsafe.Collections.Services;
 
-//BenchmarkRunner.Run<ParallelNoiseBenchmark>();
+AllocationManager.Initialize(512_000);
-
+var test = new CollectionBenchmark();
-using Misaki.HighPerformance.Unsafe.Collections;
+test.UnsafeArray();
-
+AllocationManager.Dispose();
-using var test = new UnsafeArray<Test>(10, AllocationType.UnInitialized);
-
-for (var i = 0; i < 10; i++)
-{
-    var t = new Test();
-    t.buffers[0] = i;
-    test[i] = t;
-}
-
-test.ReAlloc(20);
-
-for (var i = 0; i < 10; i++)
-{
-    Console.WriteLine(test[i].buffers[0]);
-}
-
-struct Test : IDisposable
-{
-    public UnsafeArray<float> buffers;
-
-    public Test()
-    {
-        buffers = new UnsafeArray<float>(1, AllocationType.UnInitialized);
-    }
-
-    public void Dispose()
-    {
-        buffers.Dispose();
-    }
-}

Misaki.HighPerformance.Unsafe/Buffer/Arena .cs

@@ -8,7 +8,7 @@ namespace Misaki.HighPerformance.Unsafe.Buffer;
 /// </summary>
 public unsafe struct Arena : IDisposable
 {
-    private void* _buffer;
+    private byte* _buffer;
     private uint _size;
     private uint _offset;
 
@@ -16,7 +16,7 @@ public unsafe struct Arena : IDisposable
 
     public Arena(uint size)
     {
-        _buffer = NativeMemory.Alloc(size);
+        _buffer = (byte*)Malloc(size);
         _size = size;
         _offset = 0;
     }
@@ -70,7 +70,7 @@ public unsafe struct Arena : IDisposable
 
     public void Dispose()
     {
-        NativeMemory.Free(_buffer);
+        Free(_buffer);
 
         _buffer = null;
         _size = 0;

Misaki.HighPerformance.Unsafe/Buffer/DynamicArena.cs

@@ -1,5 +1,4 @@
 using Misaki.HighPerformance.Unsafe.Collections;
-using System.Runtime.InteropServices;
 
 namespace Misaki.HighPerformance.Unsafe.Buffer;
 
@@ -27,18 +26,17 @@ public unsafe struct DynamicArena : IDisposable
     public DynamicArena(uint initialSize)
     {
         _initialSize = initialSize;
-        _root = (ArenaNode*)NativeMemory.Alloc(SizeOf<ArenaNode>());
+        _root = (ArenaNode*)Malloc(SizeOf<ArenaNode>());
         _root->arena = new Arena(initialSize);
         _root->next = null;
         _current = _root;
-        _disposed = false;
     }
 
     private bool CreateNewNode(uint size)
     {
         try
         {
-            var newNode = (ArenaNode*)NativeMemory.Alloc(SizeOf<ArenaNode>());
+            var newNode = (ArenaNode*)Malloc(SizeOf<ArenaNode>());
             newNode->arena = new Arena(size);
             newNode->next = null;
 
@@ -70,10 +68,14 @@ public unsafe struct DynamicArena : IDisposable
         {
             result = current->arena.Allocate(size, alignSize, allocationType);
             if (result != null)
+            {
                 return result;
+            }
 
             if (current->next == null && !CreateNewNode(Math.Max(size, _initialSize)))
+            {
                 return null;
+            }
 
             current = current->next;
         }
@@ -107,14 +109,16 @@ public unsafe struct DynamicArena : IDisposable
     public void Dispose()
     {
         if (_disposed)
+        {
             return;
+        }
 
         var current = _root;
         while (current != null)
         {
             var next = current->next;
             current->arena.Dispose();
-            NativeMemory.Free(current);
+            Free(current);
             current = next;
         }
 

Misaki.HighPerformance.Unsafe/Collections/AllocationType.cs

@@ -4,4 +4,10 @@ public enum AllocationType
 {
     UnInitialized,
     Clear
+}
+
+public enum Allocator
+{
+    Temp,
+    Persistent
 }

Misaki.HighPerformance.Unsafe/Collections/Contracts/IUnsafeCollection.cs

@@ -1,21 +1,38 @@
 namespace Misaki.HighPerformance.Unsafe.Collections.Contracts;
 
-public unsafe interface IUnsafeCollection<T> : IDisposable
+public unsafe interface IUnsafeCollection<T> : IEnumerable<T>, IDisposable
     where T : unmanaged
 {
-    public T* Buffer
+    /// <summary>
+    /// Gets the number of elements in a collection. The value is read-only.
+    /// </summary>
+    public int Count
     {
         get;
     }
 
-    public int Size
+    /// <summary>
+    /// Indicates whether the object has been created. Returns true if the object is created, otherwise false.
+    /// </summary>
+    public bool IsCreated
     {
         get;
     }
 
-    public ref T this[int index] { get; }
+    /// <summary>
-
+    /// Removes all elements from the collection. The collection will be empty after this operation.
+    /// </summary>
     public void Clear();
-    public void ReAlloc(int newSize);
-}
 
+    /// <summary>
+    /// Changes the size of a collection or array to the specified value.
+    /// </summary>
+    /// <param name="newSize">Specifies the new size to which the collection or array should be adjusted.</param>
+    public void Resize(int newSize);
+
+    /// <summary>
+    /// Returns a pointer to an unmanaged memory location. This pointer can be used for low-level memory operations.
+    /// </summary>
+    /// <returns>The method returns a void pointer to the unsafe memory location.</returns>
+    public void* GetUnsafePtr();
+}

Misaki.HighPerformance.Unsafe/Collections/Services/AllocationManager.cs

@@ -0,0 +1,51 @@
+using Misaki.HighPerformance.Unsafe.Buffer;
+
+namespace Misaki.HighPerformance.Unsafe.Collections.Services;
+
+public static unsafe class AllocationManager
+{
+    private static DynamicArena _arena;
+    private static bool _initialized;
+
+    private static readonly Lock _lock = new();
+
+    public static void Initialize(uint initialSize)
+    {
+        _arena = new DynamicArena(initialSize);
+        _initialized = true;
+    }
+
+    public static T* Allocate<T>(uint size, uint alignSize, Allocator allocator, AllocationType allocationType)
+        where T : unmanaged
+    {
+        if (!_initialized)
+        {
+            throw new InvalidOperationException("The AllocationManager has not been initialized.");
+        }
+
+        lock (_lock)
+        {
+            return allocator switch
+            {
+                Allocator.Temp => (T*)_arena.Allocate(size * (uint)sizeof(T), alignSize, allocationType),
+                Allocator.Persistent => (T*)AlignedAlloc((nuint)(size * sizeof(T)), alignSize),
+                _ => throw new ArgumentOutOfRangeException(nameof(allocator), "Invalid allocator type."),
+            };
+        }
+    }
+
+    public static void Reset(bool clear = false)
+    {
+        if (!_initialized)
+        {
+            throw new InvalidOperationException("The AllocationManager has not been initialized.");
+        }
+
+        _arena.Reset(clear);
+    }
+
+    public static void Dispose()
+    {
+        _arena.Dispose();
+    }
+}

Misaki.HighPerformance.Unsafe/Collections/UnsafeArray.cs

@@ -1,21 +1,25 @@
 using Misaki.HighPerformance.Unsafe.Collections.Contracts;
+using Misaki.HighPerformance.Unsafe.Collections.Services;
 using Misaki.HighPerformance.Unsafe.Helpers;
 using System.Collections;
 using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
 
 namespace Misaki.HighPerformance.Unsafe.Collections;
 
-public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T>
+/// <summary>
+/// A structure for managing an array of unmanaged types with unsafe memory operations.
+/// </summary>
+/// <typeparam name="T">Represents a type that can be stored in an unmanaged memory context.</typeparam>
+public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>
     where T : unmanaged
 {
     private struct Enumerator : IEnumerator<T>
     {
-        private UnsafeArray<T> _collection;
+        private UnsafeArray<T>* _collection;
         private int _index;
         private T _value;
 
-        public Enumerator(ref UnsafeArray<T> collection)
+        public Enumerator(UnsafeArray<T>* collection)
         {
             _collection = collection;
             _index = -1;
@@ -26,9 +30,9 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T>
         public bool MoveNext()
         {
             _index++;
-            if (_index < _collection.Size)
+            if (_index < _collection->_count)
             {
-                _value = UnsafeUtilities.ReadArrayElement<T>(_collection.Buffer, _index);
+                _value = UnsafeUtilities.ReadArrayElement<T>(_collection->_buffer, _index);
                 return true;
             }
 
@@ -42,22 +46,16 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T>
         }
 
         // Let NativeArray indexer check for out of range.
-        public T Current
+        public readonly T Current
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get
+            get => _value;
-            {
-                return _value;
-            }
         }
 
-        object IEnumerator.Current
+        readonly object IEnumerator.Current
         {
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
-            get
+            get => Current;
-            {
-                return Current;
-            }
         }
 
         public void Dispose()
@@ -66,10 +64,9 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T>
     }
 
     private T* _buffer;
-    private int _size;
+    private int _count;
 
-    public readonly T* Buffer => _buffer;
+    public readonly int Count => _count;
-    public readonly int Size => _size;
 
     public readonly ref T this[int index]
     {
@@ -77,14 +74,31 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T>
         get => ref UnsafeUtilities.ReadArrayElementRef<T>(_buffer, index);
     }
 
-    public IEnumerator<T> GetEnumerator() => new Enumerator(ref this);
+    public readonly bool IsCreated
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => _buffer != null;
+    }
 
+    public IEnumerator<T> GetEnumerator() => new Enumerator((UnsafeArray<T>*)UnsafeUtilities.AddressOf(ref this));
     IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 
-    public UnsafeArray(int size, AllocationType allocationType)
+    /// <summary>
+    /// Initializes a new instance of UnsafeArray with a specified number of elements and an allocation type. It
+    /// allocates memory and optionally clears it.
+    /// </summary>
+    /// <param name="count">Specifies the number of elements to allocate in the array, which must be greater than zero.</param>
+    /// <param name="allocationType">Determines how the allocated memory should be initialized, either uninitialized or cleared.</param>
+    /// <exception cref="ArgumentOutOfRangeException">Thrown when the specified number of elements is less than or equal to zero.</exception>
+    public UnsafeArray(int count, Allocator allocator, AllocationType allocationType = AllocationType.UnInitialized)
     {
-        _size = size;
+        if (count <= 0)
-        _buffer = (T*)NativeMemory.AlignedAlloc((nuint)(size * sizeof(T)), AlignOf<T>());
+        {
+            throw new ArgumentOutOfRangeException(nameof(count), "Count must be greater than zero.");
+        }
+
+        _buffer = AllocationManager.Allocate<T>((uint)count, (uint)AlignOf<T>(), allocator, allocationType);
+        _count = count;
 
         if (allocationType == AllocationType.Clear)
         {
@@ -92,29 +106,47 @@ public unsafe struct UnsafeArray<T> : IUnsafeCollection<T>, IEnumerable<T>
         }
     }
 
-    public void ReAlloc(int newSize)
+    /// <summary>
+    /// Initializes an UnsafeArray with a pointer to a buffer and a count of elements. The count is adjusted based on
+    /// the size of the type T.
+    /// </summary>
+    /// <param name="buffer">A pointer to the memory location that holds the elements of the array.</param>
+    /// <param name="count">The total size of the data in bytes, which is divided by the size of type T to determine the number of elements.</param>
+    public UnsafeArray(void* buffer, int count)
     {
-        if (newSize == _size)
+        _buffer = (T*)buffer;
+        _count = count;
+    }
+
+    public void Resize(int newSize)
+    {
+        if (newSize == _count)
         {
             return;
         }
 
-        _buffer = (T*)NativeMemory.AlignedRealloc(_buffer, (nuint)(newSize * sizeof(T)), AlignOf<T>());
+        _buffer = (T*)AlignedRealloc(_buffer, (nuint)(newSize * sizeof(T)), AlignOf<T>());
-        _size = newSize;
+        _count = newSize;
     }
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public void Clear()
+    public readonly void Clear()
     {
-        MemClear(_buffer, (uint)(_size * sizeof(T)));
+        MemClear(_buffer, (uint)(_count * sizeof(T)));
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void* GetUnsafePtr()
+    {
+        return _buffer;
     }
 
     public void Dispose()
     {
-        NativeMemory.AlignedFree(_buffer);
+        AlignedFree(_buffer);
 
         _buffer = null;
-        _size = 0;
+        _count = 0;
     }
 }
 

Misaki.HighPerformance.Unsafe/Collections/UnsafeHashMap.cs

@@ -0,0 +1,205 @@
+using Misaki.HighPerformance.Unsafe.Collections.Contracts;
+using Misaki.HighPerformance.Unsafe.Helpers;
+using System.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Misaki.HighPerformance.Unsafe.Collections;
+
+public unsafe struct UnsafeHashMap<TKey, TValue> : IUnsafeCollection<KeyValuePair<TKey, TValue>> where TKey : unmanaged, IEquatable<TKey> where TValue : unmanaged
+{
+    private struct Enumerator : IEnumerator<KeyValuePair<TKey, TValue>>
+    {
+        internal HashMapHelper<TKey>.Enumerator _enumerator;
+
+        public Enumerator(HashMapHelper<TKey>* data)
+        {
+            _enumerator = new HashMapHelper<TKey>.Enumerator(data);
+        }
+
+        /// <summary>
+        /// The current key-value pair.
+        /// </summary>
+        /// <value>The current key-value pair.</value>
+        public KeyValuePair<TKey, TValue> Current
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => _enumerator.GetCurrent<TValue>();
+        }
+
+        /// <summary>
+        /// Gets the element at the current position of the enumerator in the container.
+        /// </summary>
+        object IEnumerator.Current => Current;
+
+        /// <summary>
+        /// Advances the enumerator to the next key-value pair.
+        /// </summary>
+        /// <returns>True if <see cref="Current"/> is valid to read after the call.</returns>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool MoveNext() => _enumerator.MoveNext();
+
+        /// <summary>
+        /// Resets the enumerator to its initial state.
+        /// </summary>
+        public void Reset() => _enumerator.Reset();
+
+        /// <summary>
+        /// Does nothing.
+        /// </summary>
+        public void Dispose()
+        {
+        }
+    }
+
+    private HashMapHelper<TKey> _hashMap;
+
+    public readonly int Count => _hashMap.Count;
+    public readonly int Capacity => _hashMap.Capacity;
+    public readonly bool IsCreated => _hashMap.IsCreated;
+
+    /// <summary>
+    /// Gets and sets values by key.
+    /// </summary>
+    /// <remarks>Getting a key that is not present will throw. Setting a key that is not already present will add the key.</remarks>
+    /// <param name="key">The key to look up.</param>
+    /// <value>The value associated with the key.</value>
+    /// <exception cref="ArgumentException">For getting, thrown if the key was not present.</exception>
+    public TValue this[TKey key]
+    {
+        get
+        {
+            if (!_hashMap.TryGetValue<TValue>(key, out var result))
+            {
+                throw new ArgumentException($"Key: {key} is not present.");
+            }
+
+            return result;
+        }
+
+        set
+        {
+            var idx = _hashMap.Find(key);
+            if (-1 != idx)
+            {
+                UnsafeUtilities.WriteArrayElement(_hashMap.Buffer, idx, value);
+                return;
+            }
+
+            TryAdd(key, value);
+        }
+    }
+
+    public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator() => new Enumerator((HashMapHelper<TKey>*)UnsafeUtilities.AddressOf(ref _hashMap));
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+    public UnsafeHashMap(int capacity)
+    {
+        _hashMap = new HashMapHelper<TKey>(capacity, sizeof(TValue), HashMapHelper<TKey>.MINIMAL_CAPACITY);
+    }
+
+    /// <summary>
+    /// Adds a new key-value pair.
+    /// </summary>
+    /// <remarks>If the key is already present, this method returns false without modifying the hash map.</remarks>
+    /// <param name="key">The key to add.</param>
+    /// <param name="item">The value to add.</param>
+    /// <returns>True if the key-value pair was added.</returns>
+    public bool TryAdd(TKey key, TValue item)
+    {
+        var idx = _hashMap.TryAdd(key);
+        if (idx != -1)
+        {
+            UnsafeUtilities.WriteArrayElement(_hashMap.Buffer, idx, item);
+            return true;
+        }
+
+        return false;
+    }
+
+    /// <summary>
+    /// Adds a new key-value pair.
+    /// </summary>
+    /// <remarks>If the key is already present, this method throws without modifying the hash map.</remarks>
+    /// <param name="key">The key to add.</param>
+    /// <param name="item">The value to add.</param>
+    /// <exception cref="ArgumentException">Thrown if the key was already present.</exception>
+    public void Add(TKey key, TValue item)
+    {
+        var result = TryAdd(key, item);
+        if (!result)
+        {
+            throw new ArgumentException($"An item with the same key has already been added: {key}");
+        }
+    }
+
+    /// <summary>
+    /// Returns the value associated with a key.
+    /// </summary>
+    /// <param name="key">The key to look up.</param>
+    /// <param name="item">Outputs the value associated with the key. Outputs default if the key was not present.</param>
+    /// <returns>True if the key was present.</returns>
+    public bool TryGetValue(TKey key, out TValue item)
+    {
+        return _hashMap.TryGetValue(key, out item);
+    }
+
+    /// <summary>
+    /// Returns true if a given key is present in this hash map.
+    /// </summary>
+    /// <param name="key">The key to look up.</param>
+    /// <returns>True if the key was present.</returns>
+    public bool ContainsKey(TKey key)
+    {
+        return -1 != _hashMap.Find(key);
+    }
+
+    /// <summary>
+    /// Sets the capacity to match what it would be if it had been originally initialized with all its entries.
+    /// </summary>
+    public void TrimExcess() => _hashMap.TrimExcess();
+
+    public void Resize(int newSize)
+    {
+        _hashMap.Resize(newSize);
+    }
+
+    public void Clear()
+    {
+        _hashMap.Clear();
+    }
+
+    /// <summary>
+    /// Retrieves an array of keys from the hash map.
+    /// </summary>
+    /// <returns>An array containing the keys stored in the hash map.</returns>
+    public UnsafeArray<TKey> GetKeyArray(Allocator allocator) => _hashMap.GetKeyArray(allocator);
+
+    /// <summary>
+    /// Retrieves an array of values from the underlying hash map.
+    /// </summary>
+    /// <returns>An UnsafeArray containing the values stored in the hash map.</returns>
+    public UnsafeArray<TValue> GetValueArray(Allocator allocator) => _hashMap.GetValueArray<TValue>(allocator);
+
+    /// <summary>
+    /// Retrieves an array of key-value pairs from the hash map. The keys are of type TKey and the values are of type
+    /// TValue.
+    /// </summary>
+    /// <returns>Returns an UnsafeArray containing KeyValuePair objects.</returns>
+    public UnsafeArray<KeyValuePair<TKey, TValue>> GetKeyValueArrays(Allocator allocator) => _hashMap.GetKeyValueArrays<TValue>(allocator);
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void* GetUnsafePtr()
+    {
+        return _hashMap.Buffer;
+    }
+
+    public void Dispose()
+    {
+        _hashMap.Dispose();
+    }
+
+    public void Test(ref HashMapHelper<TKey> t)
+    {
+        Console.WriteLine(t.Equals(_hashMap));
+    }
+}

Misaki.HighPerformance.Unsafe/Collections/UnsafeHashSet.cs

@@ -0,0 +1,122 @@
+using Misaki.HighPerformance.Unsafe.Collections.Contracts;
+using Misaki.HighPerformance.Unsafe.Helpers;
+using System.Collections;
+using System.Runtime.CompilerServices;
+
+namespace Misaki.HighPerformance.Unsafe.Collections;
+
+/// <summary>
+/// A collection that provides fast, unsafe operations for managing a set of unmanaged types. It supports adding,
+/// removing, and checking for values.
+/// </summary>
+/// <typeparam name="T">Represents an unmanaged type that can be compared for equality.</typeparam>
+public unsafe struct UnsafeHashSet<T> : IUnsafeCollection<T>, IEnumerable<T>
+    where T : unmanaged, IEquatable<T>
+{
+    private struct Enumerator : IEnumerator<T>
+    {
+        internal HashMapHelper<T>.Enumerator _enumerator;
+
+        public Enumerator(HashMapHelper<T>* hashMap)
+        {
+            _enumerator = new HashMapHelper<T>.Enumerator(hashMap);
+        }
+
+        public T Current
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => _enumerator.buffer->_keys[_enumerator.index];
+        }
+
+        object IEnumerator.Current => Current;
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool MoveNext() => _enumerator.MoveNext();
+
+        public void Reset() => _enumerator.Reset();
+
+        public readonly void Dispose()
+        {
+        }
+    }
+
+    private HashMapHelper<T> _hashMap;
+
+    public readonly int Count => _hashMap.Count;
+    public readonly int Capacity => _hashMap.Capacity;
+    public readonly bool IsCreated => _hashMap.IsCreated;
+
+    public IEnumerator<T> GetEnumerator() => new Enumerator((HashMapHelper<T>*)UnsafeUtilities.AddressOf(ref _hashMap));
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+    public UnsafeHashSet(int capacity)
+    {
+        _hashMap = new HashMapHelper<T>(capacity, 0, HashMapHelper<T>.MINIMAL_CAPACITY);
+    }
+
+    /// <summary>
+    /// Adds a new value (unless it is already present).
+    /// </summary>
+    /// <param name="item">The value to add.</param>
+    /// <returns>True if the value was not already present.</returns>
+    public bool Add(T item)
+    {
+        return -1 != _hashMap.TryAdd(item);
+    }
+
+    /// <summary>
+    /// Removes a particular value.
+    /// </summary>
+    /// <param name="item">The value to remove.</param>
+    /// <returns>True if the value was present.</returns>
+    public bool Remove(T item)
+    {
+        return -1 != _hashMap.TryRemove(item);
+    }
+
+    /// <summary>
+    /// Returns true if a particular value is present.
+    /// </summary>
+    /// <param name="item">The value to check for.</param>
+    /// <returns>True if the value was present.</returns>
+    public bool Contains(T item)
+    {
+        return -1 != _hashMap.Find(item);
+    }
+
+    /// <summary>
+    /// Sets the capacity to match what it would be if it had been originally initialized with all its entries.
+    /// </summary>
+    public void TrimExcess() => _hashMap.TrimExcess();
+
+    /// <summary>
+    /// Returns an array with a copy of this set's values (in no particular order).
+    /// </summary>
+    /// <param name="allocator">The allocator to use.</param>
+    /// <returns>An array with a copy of the set's values.</returns>
+    public UnsafeArray<T> ToNativeArray(Allocator allocator)
+    {
+        return _hashMap.GetKeyArray(allocator);
+    }
+
+    public void Resize(int newSize)
+    {
+        _hashMap.Resize(newSize);
+    }
+
+    public void Clear()
+    {
+        _hashMap.Clear();
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void* GetUnsafePtr()
+    {
+        return _hashMap.Buffer;
+    }
+
+    public void Dispose()
+    {
+        _hashMap.Dispose();
+    }
+}

Misaki.HighPerformance.Unsafe/Collections/UnsafeList.cs

@@ -5,16 +5,20 @@ using System.Runtime.CompilerServices;
 
 namespace Misaki.HighPerformance.Unsafe.Collections;
 
-public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
+/// <summary>
+/// A collection that allows for unsafe operations on a list of unmanaged types.
+/// </summary>
+/// <typeparam name="T">Represents a type that can be stored in the collection, constrained to unmanaged types for performance and safety.</typeparam>
+public unsafe struct UnsafeList<T> : IUnsafeCollection<T>
     where T : unmanaged
 {
     private struct Enumerator : IEnumerator<T>
     {
-        private UnsafeList<T> _collection;
+        private UnsafeList<T>* _collection;
         private int _index;
         private T _value;
 
-        public Enumerator(ref UnsafeList<T> collection)
+        public Enumerator(UnsafeList<T>* collection)
         {
             _collection = collection;
             _index = -1;
@@ -25,9 +29,9 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
         public bool MoveNext()
         {
             _index++;
-            if (_index < _collection.Size)
+            if (_index < _collection->_count)
             {
-                _value = UnsafeUtilities.ReadArrayElement<T>(_collection.Buffer, _index);
+                _value = UnsafeUtilities.ReadArrayElement<T>(_collection->_array.GetUnsafePtr(), _index);
                 return true;
             }
 
@@ -88,9 +92,9 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
         /// <param name="value">The value to be added to the collection.</param>
         public void AddNoResize(T value)
         {
-            var idx = Interlocked.Increment(ref listData->_size) - 1;
+            var idx = Interlocked.Increment(ref listData->_count) - 1;
             listData->CheckNoResizeCapacity(idx, 1);
-            UnsafeUtilities.WriteArrayElement(listData->Buffer, idx, value);
+            UnsafeUtilities.WriteArrayElement(listData->_array.GetUnsafePtr(), idx, value);
         }
 
         /// <summary>
@@ -100,19 +104,19 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
         /// <param name="count">Indicates the number of elements to be added from the source data.</param>
         public void AddRangeNoResize(T* ptr, int count)
         {
-            var idx = Interlocked.Add(ref listData->_size, count) - count;
+            var idx = Interlocked.Add(ref listData->_count, count) - count;
             listData->CheckNoResizeCapacity(idx, count);
-            MemCpy(listData->Buffer + idx, ptr, (uint)(count * sizeof(T)));
+            MemCpy(UnsafeUtilities.ReadArrayElementUnsafe<T>(listData->_array.GetUnsafePtr(), idx), ptr, (uint)(count * sizeof(T)));
         }
     }
 
     private UnsafeArray<T> _array;
 
-    private int _size;
+    private int _count;
 
-    public readonly T* Buffer => _array.Buffer;
+    public readonly int Count => _count;
-    public readonly int Size => _size;
+    public readonly int Capacity => _array.Count;
-    public readonly int Capacity => _array.Size;
+    public readonly bool IsCreated => _array.IsCreated;
 
     public readonly ref T this[int index]
     {
@@ -120,17 +124,15 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
         get => ref _array[index];
     }
 
-    public IEnumerator<T> GetEnumerator() => new Enumerator(ref this);
+    public IEnumerator<T> GetEnumerator() => new Enumerator((UnsafeList<T>*)UnsafeUtilities.AddressOf(ref this));
-
     IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 
-    public ParallelWriter AsParallelWriter() =>
+    public ParallelWriter AsParallelWriter() => new((UnsafeList<T>*)UnsafeUtilities.AddressOf(ref this));
-        new((UnsafeList<T>*)UnsafeUtilities.AddressOf(ref this));
 
-    public UnsafeList(int capacity, AllocationType allocationType)
+    public UnsafeList(int capacity, Allocator allocator, AllocationType allocationType = AllocationType.UnInitialized)
     {
-        _array = new UnsafeArray<T>(capacity, allocationType);
+        _array = new UnsafeArray<T>(capacity, allocator, allocationType);
-        _size = 0;
+        _count = 0;
 
         if (allocationType == AllocationType.Clear)
         {
@@ -140,7 +142,7 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
 
     private readonly void CheckNoResizeCapacity(int count)
     {
-        CheckNoResizeCapacity(count, Size);
+        CheckNoResizeCapacity(count, Count);
     }
 
     private readonly void CheckNoResizeCapacity(int index, int count)
@@ -148,7 +150,7 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
         if (index + count > Capacity)
         {
             throw new Exception(
-                $"AddNoResize assumes that list capacity is sufficient (Capacity {Capacity}, Size {Size}), requested count {count}!"
+                $"AddNoResize assumes that list capacity is sufficient (Capacity {Capacity}, Size {Count}), requested count {count}!"
             );
         }
     }
@@ -165,12 +167,12 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
             throw new ArgumentOutOfRangeException($"Value for index {index} must be positive.");
         }
 
-        if (index > Size)
+        if (index > Count)
         {
             throw new ArgumentOutOfRangeException($"Value for index {index} is out of bounds.");
         }
 
-        if (index + count > Size)
+        if (index + count > Count)
         {
             throw new ArgumentOutOfRangeException($"Value for count {count} is out of bounds.");
         }
@@ -178,37 +180,37 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
 
     public void Add(T value)
     {
-        if (_size >= Capacity)
+        if (_count >= Capacity)
         {
-            ReAlloc(Capacity + (int)(Capacity * 0.5f));
+            Resize(Capacity + (int)(Capacity * 0.5f));
         }
 
-        UnsafeUtilities.WriteArrayElement(Buffer, _size, value);
+        UnsafeUtilities.WriteArrayElement(_array.GetUnsafePtr(), _count, value);
-        _size++;
+        _count++;
     }
 
     public void AddNoResize(T value)
     {
         CheckNoResizeCapacity(1);
 
-        UnsafeUtilities.WriteArrayElement(Buffer, _size, value);
+        UnsafeUtilities.WriteArrayElement(_array.GetUnsafePtr(), _count, value);
-        _size++;
+        _count++;
     }
 
     public void AddRange(Span<T> values, int count)
     {
-        var newSize = _size + count;
+        var newSize = _count + count;
         if (newSize > Capacity)
         {
-            ReAlloc(Capacity + count);
+            Resize(Capacity + count);
         }
 
         fixed (T* ptr = values)
         {
-            MemCpy(_array.Buffer + _size, ptr, (uint)(count * sizeof(T)));
+            MemCpy(UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), _count), ptr, (uint)(count * sizeof(T)));
         }
 
-        _size += count;
+        _count += count;
     }
 
     public void AddRangeNoResize(ReadOnlySpan<T> values)
@@ -217,18 +219,18 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
 
         fixed (T* ptr = values)
         {
-            MemCpy(_array.Buffer + _size, ptr, (uint)(values.Length * sizeof(T)));
+            MemCpy(UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), _count), ptr, (uint)(values.Length * sizeof(T)));
         }
 
-        _size += values.Length;
+        _count += values.Length;
     }
 
     public void AddRangeNoResize(T* ptr, int count)
     {
         CheckNoResizeCapacity(count);
 
-        MemCpy(_array.Buffer + _size, ptr, (uint)(count * sizeof(T)));
+        MemCpy(UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), _count), ptr, (uint)(count * sizeof(T)));
-        _size += count;
+        _count += count;
     }
 
     public void RemoveRange(int start, int length)
@@ -240,13 +242,12 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
             return;
         }
 
-        var copyFrom = Math.Min(start + length, _size);
+        var copyFrom = Math.Min(start + length, _count);
-        MemCpy(
+        MemCpy(UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), start),
-            _array.Buffer + start,
+            UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), copyFrom),
-            _array.Buffer + copyFrom,
+            (uint)((_count - copyFrom) * sizeof(T))
-            (uint)((_size - copyFrom) * sizeof(T))
         );
-        _size -= length;
+        _count -= length;
     }
 
     public void RemoveAt(int index)
@@ -263,13 +264,12 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
             return;
         }
 
-        var copyFrom = Math.Min(_size - length, start + length);
+        var copyFrom = Math.Min(_count - length, start + length);
-        MemCpy(
+        MemCpy(UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), start),
-            _array.Buffer + start,
+            UnsafeUtilities.ReadArrayElementUnsafe<T>(_array.GetUnsafePtr(), copyFrom),
-            _array.Buffer + copyFrom,
+            (uint)((_count - copyFrom) * sizeof(T))
-            (uint)((_size - copyFrom) * sizeof(T))
         );
-        _size -= length;
+        _count -= length;
     }
 
     public void RemoveAtSwapBack(int index)
@@ -277,26 +277,47 @@ public unsafe struct UnsafeList<T> : IUnsafeCollection<T>, IEnumerable<T>
         RemoveRangeSwapBack(index, 1);
     }
 
-    public void ReAlloc(int newSize)
+    public void Resize(int newSize)
     {
-        _array.ReAlloc(newSize);
+        _array.Resize(newSize);
 
-        if (_size > newSize)
+        if (_count > newSize)
         {
-            _size = newSize;
+            _count = newSize;
         }
     }
 
     public void Clear()
     {
         _array.Clear();
-        _size = 0;
+        _count = 0;
+    }
+
+    /// <summary>
+    /// Returns a pointer to the underlying data of the array in an unsafe manner. This method is optimized for
+    /// performance.
+    /// </summary>
+    /// <returns>A pointer to the array's data.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void* GetUnsafePtr()
+    {
+        return _array.GetUnsafePtr();
+    }
+
+    /// <summary>
+    /// Converts the current array to an UnsafeArray representation using its pointer and count.
+    /// </summary>
+    /// <returns>Returns a new UnsafeArray instance initialized with the array's unsafe pointer and its count.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly UnsafeArray<T> AsUnsafeArray()
+    {
+        return new UnsafeArray<T>(_array.GetUnsafePtr(), _count);
     }
 
     public void Dispose()
     {
         _array.Dispose();
-        _size = 0;
+        _count = 0;
     }
 }
 

Misaki.HighPerformance.Unsafe/Collections/UnsafeQueue.cs

@@ -1,20 +1,75 @@
 using Misaki.HighPerformance.Unsafe.Collections.Contracts;
 using Misaki.HighPerformance.Unsafe.Helpers;
+using System.Collections;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
 
 namespace Misaki.HighPerformance.Unsafe.Collections;
 
+/// <summary>
+/// A structure that implements a queue using unmanaged types for efficient memory management.
+/// </summary>
+/// <typeparam name="T">Represents the type of elements stored in the queue, which must be an unmanaged type for performance and safety.</typeparam>
 public unsafe struct UnsafeQueue<T> : IUnsafeCollection<T>
     where T : unmanaged
 {
+    private struct Enumerator : IEnumerator<T>
+    {
+        private UnsafeQueue<T>* _collection;
+        private int _index;
+        private T _value;
+
+        public Enumerator(UnsafeQueue<T>* collection)
+        {
+            _collection = collection;
+            _index = -1;
+            _value = default;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool MoveNext()
+        {
+            _index++;
+            if (_index < _collection->_count)
+            {
+                _value = UnsafeUtilities.ReadArrayElement<T>(_collection->_array.GetUnsafePtr(), _index);
+                return true;
+            }
+
+            _value = default;
+            return false;
+        }
+
+        public void Reset()
+        {
+            _index = -1;
+        }
+
+        // Let NativeArray indexer check for out of range.
+        public readonly T Current
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => _value;
+        }
+
+        readonly object IEnumerator.Current
+        {
+            [MethodImpl(MethodImplOptions.AggressiveInlining)]
+            get => Current;
+        }
+
+        public readonly void Dispose()
+        {
+        }
+    }
+
     private UnsafeArray<T> _array;
-    private int _size;
+    private int _count;
     private int _offset;
 
-    public readonly T* Buffer => _array.Buffer;
+    public readonly int Count => _count;
-    public readonly int Size => _size;
+    public readonly int Capacity => _array.Count;
-    public readonly int Capacity => _array.Size;
+    public readonly bool IsCreated => _array.IsCreated;
 
     public readonly ref T this[int index]
     {
@@ -22,10 +77,13 @@ public unsafe struct UnsafeQueue<T> : IUnsafeCollection<T>
         get => ref _array[index];
     }
 
-    public UnsafeQueue(int capacity, AllocationType allocationType)
+    public IEnumerator<T> GetEnumerator() => new Enumerator((UnsafeQueue<T>*)UnsafeUtilities.AddressOf(ref this));
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+    public UnsafeQueue(int capacity, Allocator allocator, AllocationType allocationType = AllocationType.UnInitialized)
     {
-        _array = new UnsafeArray<T>(capacity, allocationType);
+        _array = new UnsafeArray<T>(capacity, allocator, allocationType);
-        _size = 0;
+        _count = 0;
         _offset = 0;
 
         if (allocationType == AllocationType.Clear)
@@ -34,34 +92,49 @@ public unsafe struct UnsafeQueue<T> : IUnsafeCollection<T>
         }
     }
 
+    /// <summary>
+    /// Adds an element to the end of a collection, resizing if the current capacity is reached. The new element is
+    /// stored in a circular buffer.
+    /// </summary>
+    /// <param name="value">The item to be added to the collection.</param>
     public void Enqueue(T value)
     {
-        if (_size >= Capacity)
+        if (_count >= Capacity)
         {
-            ReAlloc(Capacity + (int)(Capacity * 0.5f));
+            Resize(Capacity + (int)(Capacity * 0.5f));
         }
 
-        UnsafeUtilities.WriteArrayElement(Buffer, (_offset + _size) % Capacity, value);
+        UnsafeUtilities.WriteArrayElement(_array.GetUnsafePtr(), (_offset + _count) % Capacity, value);
-        _size++;
+        _count++;
     }
 
+    /// <summary>
+    /// Removes and returns the element at the front of the queue. If the queue is empty, an exception is thrown.
+    /// </summary>
+    /// <returns>The element that was removed from the front of the queue.</returns>
+    /// <exception cref="InvalidOperationException">Thrown when attempting to dequeue from an empty queue.</exception>
     public T Dequeue()
     {
-        if (_size == 0)
+        if (_count == 0)
         {
             throw new InvalidOperationException("Queue is empty.");
         }
 
-        var value = UnsafeUtilities.ReadArrayElement<T>(Buffer, _offset);
+        var value = UnsafeUtilities.ReadArrayElement<T>(_array.GetUnsafePtr(), _offset);
         _offset = (_offset + 1) % Capacity;
-        _size--;
+        _count--;
 
         return value;
     }
 
+    /// <summary>
+    /// Attempts to remove and return an item from a collection. Returns a boolean indicating success or failure.
+    /// </summary>
+    /// <param name="value">The output variable that will hold the dequeued item if the operation is successful.</param>
+    /// <returns>True if an item was successfully dequeued, otherwise false.</returns>
     public bool TryDequeue([MaybeNullWhen(false)] out T value)
     {
-        if (_size == 0)
+        if (_count == 0)
         {
             value = default;
             return false;
@@ -71,27 +144,33 @@ public unsafe struct UnsafeQueue<T> : IUnsafeCollection<T>
         return true;
     }
 
-    public void ReAlloc(int newSize)
+    public void Resize(int newSize)
     {
-        _array.ReAlloc(newSize);
+        _array.Resize(newSize);
 
-        if (_size > newSize)
+        if (_count > newSize)
         {
-            _size = newSize;
+            _count = newSize;
         }
     }
 
     public void Clear()
     {
         _array.Clear();
-        _size = 0;
+        _count = 0;
         _offset = 0;
     }
 
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public readonly void* GetUnsafePtr()
+    {
+        return _array.GetUnsafePtr();
+    }
+
     public void Dispose()
     {
         _array.Dispose();
-        _size = 0;
+        _count = 0;
         _offset = 0;
     }
 }

Misaki.HighPerformance.Unsafe/Helpers/HashMapHelper.cs

@@ -0,0 +1,491 @@
+using Misaki.HighPerformance.Mathematics;
+using Misaki.HighPerformance.Unsafe.Collections;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+
+namespace Misaki.HighPerformance.Unsafe.Helpers;
+
+public unsafe struct HashMapHelper<TKey> : IDisposable
+    where TKey : unmanaged, IEquatable<TKey>
+{
+    internal unsafe struct Enumerator
+    {
+        public HashMapHelper<TKey>* buffer;
+        public int index;
+        public int bucketIndex;
+        public int nextIndex;
+
+        public unsafe Enumerator(HashMapHelper<TKey>* data)
+        {
+            buffer = data;
+            index = -1;
+            bucketIndex = 0;
+            nextIndex = -1;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public bool MoveNext()
+        {
+            return buffer->MoveNext(ref bucketIndex, ref nextIndex, out index);
+        }
+
+        public void Reset()
+        {
+            index = -1;
+            bucketIndex = 0;
+            nextIndex = -1;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public KeyValuePair<TKey, TValue> GetCurrent<TValue>()
+            where TValue : unmanaged
+        {
+            return new KeyValuePair<TKey, TValue>(buffer->_keys[index], UnsafeUtilities.ReadArrayElement<TValue>(buffer->_buffer, index));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public TKey GetCurrentKey()
+        {
+            if (index != -1)
+            {
+                return buffer->_keys[index];
+            }
+
+            return default;
+        }
+
+        public void Dispose()
+        {
+        }
+    }
+
+    // This buffer has 4 parts: TValue, TKey, Next, Buckets.
+    private byte* _buffer;
+
+    internal TKey* _keys;
+    internal int* _next;
+    internal int* _buckets;
+
+    private int _count;
+    private int _capacity;
+    private int _bucketCapacity;
+    private int _allocatedIndex;
+    private int _firstFreeIndex;
+
+    private readonly int _sizeOfTValue;
+    private readonly int _log2MinGrowth;
+
+    public const int MINIMAL_CAPACITY = 64;
+
+    public readonly byte* Buffer
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => _buffer;
+    }
+
+    public readonly int Count
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => _count;
+    }
+
+    public readonly int Capacity
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => _capacity;
+    }
+
+    public readonly bool IsCreated
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => _buffer != null;
+    }
+
+    public readonly bool IsEmpty
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        get => !IsCreated || _count == 0;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private readonly int CalcCapacityCeilPow2(int capacity)
+    {
+        capacity = Math.Max(Math.Max(1, _count), capacity);
+        var newCapacity = Math.Max(capacity, 1 << _log2MinGrowth);
+        var result = MathUtilities.CeilPow2(newCapacity);
+
+        return result;
+    }
+
+    private static int CalculateDataSize(int capacity, int bucketCapacity, int sizeOfTValue, out int outKeyOffset, out int outNextOffset, out int outBucketOffset)
+    {
+        var sizeOfTKey = sizeof(TKey);
+        var sizeOfInt = sizeof(int);
+
+        var valuesSize = sizeOfTValue * capacity;
+        var keysSize = sizeOfTKey * capacity;
+        var nextSize = sizeOfInt * capacity;
+        var bucketSize = sizeOfInt * bucketCapacity;
+        var totalSize = valuesSize + keysSize + nextSize + bucketSize;
+
+        outKeyOffset = 0 + valuesSize;
+        outNextOffset = outKeyOffset + keysSize;
+        outBucketOffset = outNextOffset + nextSize;
+
+        return totalSize;
+    }
+
+    public HashMapHelper(int capacity, int sizeOfTValue, uint minGrowth)
+    {
+        if (capacity <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(capacity), "Capacity must be greater than zero.");
+        }
+
+        if (sizeOfTValue <= 0)
+        {
+            throw new ArgumentOutOfRangeException(nameof(sizeOfTValue), "Size of TValue must be greater than zero.");
+        }
+
+        _capacity = CalcCapacityCeilPow2(capacity);
+        _bucketCapacity = _capacity * 2;
+
+        var totalSize = CalculateDataSize(_capacity, _bucketCapacity, sizeOfTValue,
+            out var keyOffset, out var nextOffset, out var bucketOffset);
+
+        _buffer = (byte*)Malloc((nuint)totalSize);
+        _keys = (TKey*)(_buffer + keyOffset);
+        _next = (int*)(_buffer + nextOffset);
+        _buckets = (int*)(_buffer + bucketOffset);
+
+        Clear();
+
+        _sizeOfTValue = sizeOfTValue;
+        _log2MinGrowth = BitOperations.Log2(minGrowth);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private readonly int GetBucket(in TKey key)
+    {
+        return (int)((uint)key.GetHashCode() & _bucketCapacity - 1);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private readonly void CheckIndexOutOfBounds(int idx)
+    {
+        if ((uint)idx >= (uint)_capacity)
+        {
+            throw new InvalidOperationException($"Internal HashMap error. idx {idx}");
+        }
+    }
+
+    internal void ResizeExact(int newCapacity, int newBucketCapacity)
+    {
+        var totalSize = CalculateDataSize(newCapacity, newBucketCapacity, _sizeOfTValue,
+            out var keyOffset, out var nextOffset, out var bucketOffset);
+
+        var oldBuffer = _buffer;
+        var oldKeys = _keys;
+        var oldNext = _next;
+        var oldBuckets = _buckets;
+        var oldBucketCapacity = _bucketCapacity;
+
+        _buffer = (byte*)Malloc((nuint)totalSize);
+        _keys = (TKey*)(_buffer + keyOffset);
+        _next = (int*)(_buffer + nextOffset);
+        _buckets = (int*)(_buffer + bucketOffset);
+        _capacity = newCapacity;
+        _bucketCapacity = newBucketCapacity;
+
+        Clear();
+
+        for (int i = 0, num = oldBucketCapacity; i < num; ++i)
+        {
+            for (var idx = oldBuckets[i]; idx != -1; idx = oldNext[idx])
+            {
+                var newIdx = TryAdd(oldKeys[idx]);
+                MemCpy(_buffer + _sizeOfTValue * newIdx, oldBuffer + _sizeOfTValue * idx, (nuint)_sizeOfTValue);
+            }
+        }
+
+        Free(oldBuffer);
+    }
+
+    internal void Resize(int newCapacity)
+    {
+        newCapacity = Math.Max(newCapacity, _count);
+        var newBucketCapacity = MathUtilities.CeilPow2(newCapacity * 2);
+
+        if (_capacity == newCapacity && _bucketCapacity == newBucketCapacity)
+        {
+            return;
+        }
+
+        ResizeExact(newCapacity, newBucketCapacity);
+    }
+
+    public void TrimExcess()
+    {
+        var capacity = CalcCapacityCeilPow2(_count);
+        ResizeExact(capacity, capacity * 2);
+    }
+
+    public int Find(TKey key)
+    {
+        if (_allocatedIndex <= 0)
+        {
+            return -1;
+        }
+
+        // First find the slot based on the hash
+        var bucket = GetBucket(key);
+        var entryIdx = _buckets[bucket];
+
+        if ((uint)entryIdx < (uint)_capacity)
+        {
+            var nextPtrs = _next;
+            var test = UnsafeUtilities.ReadArrayElement<TKey>(_keys, entryIdx);
+            var test2 = UnsafeUtilities.ReadArrayElement<TKey>(_next, 0);
+            while (!UnsafeUtilities.ReadArrayElement<TKey>(_keys, entryIdx).Equals(key))
+            {
+                entryIdx = nextPtrs[entryIdx];
+                if ((uint)entryIdx >= (uint)_capacity)
+                {
+                    return -1;
+                }
+            }
+
+            return entryIdx;
+        }
+
+        return -1;
+    }
+
+    public int TryAdd(in TKey key)
+    {
+        if (Find(key) != -1)
+        {
+            return -1;
+        }
+
+        // Allocate an entry from the free list
+        int idx;
+        int* next;
+
+        if (_allocatedIndex >= _capacity && _firstFreeIndex < 0)
+        {
+            var newCap = Math.Min(MINIMAL_CAPACITY, CalcCapacityCeilPow2(_capacity + (1 << _log2MinGrowth)));
+            Resize(newCap);
+        }
+
+        idx = _firstFreeIndex;
+
+        if (idx >= 0)
+        {
+            _firstFreeIndex = _next[idx];
+        }
+        else
+        {
+            idx = _allocatedIndex++;
+        }
+
+        CheckIndexOutOfBounds(idx);
+
+        UnsafeUtilities.WriteArrayElement(_keys, idx, key);
+        var bucket = GetBucket(key);
+
+        // Add the index to the hash-map
+        next = _next;
+        next[idx] = _buckets[bucket];
+        _buckets[bucket] = idx;
+        _count++;
+
+        return idx;
+    }
+
+    public int TryRemove(TKey key)
+    {
+        if (_capacity == 0)
+        {
+            return -1;
+        }
+
+        var removed = 0;
+
+        // First find the slot based on the hash
+        var bucket = GetBucket(key);
+
+        var prevEntry = -1;
+        var entryIdx = _buckets[bucket];
+
+        while (entryIdx >= 0 && entryIdx < _capacity)
+        {
+            if (UnsafeUtilities.ReadArrayElement<TKey>(_keys, entryIdx).Equals(key))
+            {
+                ++removed;
+
+                // Found matching element, remove it
+                if (prevEntry < 0)
+                {
+                    _buckets[bucket] = _next[entryIdx];
+                }
+                else
+                {
+                    _next[prevEntry] = _next[entryIdx];
+                }
+
+                // And free the index
+                var nextIdx = _next[entryIdx];
+                _next[entryIdx] = _firstFreeIndex;
+                _firstFreeIndex = entryIdx;
+                entryIdx = nextIdx;
+
+                break;
+            }
+            else
+            {
+                prevEntry = entryIdx;
+                entryIdx = _next[entryIdx];
+            }
+        }
+
+        _count -= removed;
+        return 0 != removed ? removed : -1;
+    }
+
+    public bool TryGetValue<TValue>(TKey key, out TValue item)
+        where TValue : unmanaged
+    {
+        var idx = Find(key);
+
+        if (idx != -1)
+        {
+            item = UnsafeUtilities.ReadArrayElement<TValue>(_buffer, idx);
+            return true;
+        }
+
+        item = default;
+        return false;
+    }
+
+    public bool MoveNextSearch(ref int bucketIndex, ref int nextIndex, out int index)
+    {
+        for (int i = bucketIndex, num = _bucketCapacity; i < num; ++i)
+        {
+            var idx = _buckets[i];
+
+            if (idx != -1)
+            {
+                index = idx;
+                bucketIndex = i + 1;
+                nextIndex = _next[idx];
+
+                return true;
+            }
+        }
+
+        index = -1;
+        bucketIndex = _bucketCapacity;
+        nextIndex = -1;
+        return false;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool MoveNext(ref int bucketIndex, ref int nextIndex, out int index)
+    {
+        if (nextIndex != -1)
+        {
+            index = nextIndex;
+            nextIndex = _next[nextIndex];
+            return true;
+        }
+
+        return MoveNextSearch(ref bucketIndex, ref nextIndex, out index);
+    }
+
+    internal UnsafeArray<TKey> GetKeyArray(Allocator allocator)
+    {
+        var result = new UnsafeArray<TKey>(_count, allocator, AllocationType.UnInitialized);
+
+        for (int i = 0, count = 0, max = result.Count, capacity = _bucketCapacity; i < capacity && count < max; i++)
+        {
+            var bucket = _buckets[i];
+
+            while (bucket != -1)
+            {
+                result[count++] = UnsafeUtilities.ReadArrayElement<TKey>(_keys, bucket);
+                bucket = _next[bucket];
+            }
+        }
+
+        return result;
+    }
+
+    internal UnsafeArray<TValue> GetValueArray<TValue>(Allocator allocator)
+        where TValue : unmanaged
+    {
+        var result = new UnsafeArray<TValue>(_count, allocator, AllocationType.UnInitialized);
+
+        for (int i = 0, count = 0, max = result.Count, capacity = _bucketCapacity; i < capacity && count < max; ++i)
+        {
+            var bucket = _buckets[i];
+
+            while (bucket != -1)
+            {
+                result[count++] = UnsafeUtilities.ReadArrayElement<TValue>(_buffer, bucket);
+                bucket = _next[bucket];
+            }
+        }
+
+        return result;
+    }
+
+    public UnsafeArray<KeyValuePair<TKey, TValue>> GetKeyValueArrays<TValue>(Allocator allocator)
+        where TValue : unmanaged
+    {
+        var result = new UnsafeArray<KeyValuePair<TKey, TValue>>(_count, allocator, AllocationType.UnInitialized);
+
+        for (int i = 0, count = 0, max = result.Count, capacity = _bucketCapacity; i < capacity && count < max; i++)
+        {
+            var bucket = _buckets[i];
+
+            while (bucket != -1)
+            {
+                result[count] = new(UnsafeUtilities.ReadArrayElement<TKey>(_keys, bucket),
+                    UnsafeUtilities.ReadArrayElement<TValue>(_buffer, bucket));
+
+                count++;
+                bucket = _next[bucket];
+            }
+        }
+
+        return result;
+    }
+
+    public void Clear()
+    {
+        MemSet(_buckets, 0xff, (nuint)_bucketCapacity * sizeof(int));
+        MemSet(_next, 0xff, (nuint)_capacity * sizeof(int));
+
+        _count = 0;
+        _firstFreeIndex = -1;
+        _allocatedIndex = 0;
+    }
+
+    public void Dispose()
+    {
+        if (IsCreated)
+        {
+            Free(_buffer);
+
+            _buffer = null;
+            _keys = null;
+            _next = null;
+            _buckets = null;
+
+            _count = 0;
+            _capacity = 0;
+            _bucketCapacity = 0;
+        }
+    }
+}

Misaki.HighPerformance.Unsafe/Helpers/MemoryUtilities.cs

@@ -13,6 +13,76 @@ public static unsafe class MemoryUtilities
         public T data;
     }
 
+    /// <summary>
+    /// Allocates a block of memory of the specified size in bytes.
+    /// </summary>
+    /// <param name="size">Specifies the number of bytes to allocate in memory.</param>
+    /// <returns>Returns a pointer to the allocated memory block.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void* Malloc(nuint size)
+    {
+        return NativeMemory.Alloc(size);
+    }
+
+    /// <summary>
+    /// Allocates a block of memory with a specified size and alignment.
+    /// </summary>
+    /// <param name="size">Specifies the total number of bytes to allocate for the memory block.</param>
+    /// <param name="alignment">Defines the required alignment for the allocated memory address.</param>
+    /// <returns>Returns a pointer to the allocated memory block.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void* AlignedAlloc(nuint size, nuint alignment)
+    {
+        return NativeMemory.AlignedAlloc(size, alignment);
+    }
+
+    /// <summary>
+    /// Resizes a previously allocated memory block to a new size. It returns a pointer to the reallocated memory.
+    /// </summary>
+    /// <param name="ptr">The pointer to the memory block that needs to be resized.</param>
+    /// <param name="size">The new size for the memory block after resizing.</param>
+    /// <returns>A pointer to the reallocated memory block, or null if the operation fails.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void* Realloc(void* ptr, nuint size)
+    {
+        return NativeMemory.Realloc(ptr, size);
+    }
+
+    /// <summary>
+    /// Reallocates memory to a specified size with a given alignment. It returns a pointer to the newly allocated
+    /// memory.
+    /// </summary>
+    /// <param name="ptr">The pointer to the existing memory block that needs to be reallocated.</param>
+    /// <param name="size">The new size for the memory allocation.</param>
+    /// <param name="alignment">The required alignment for the new memory allocation.</param>
+    /// <returns>A pointer to the reallocated memory block, or null if the allocation fails.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void* AlignedRealloc(void* ptr, nuint size, nuint alignment)
+    {
+        return NativeMemory.AlignedRealloc(ptr, size, alignment);
+    }
+
+    /// <summary>
+    /// Releases the allocated memory pointed to by the given pointer. This helps in managing memory usage effectively.
+    /// </summary>
+    /// <param name="ptr">The pointer to the memory block that needs to be freed.</param>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void Free(void* ptr)
+    {
+        NativeMemory.Free(ptr);
+    }
+
+    /// <summary>
+    /// Releases memory that was allocated with alignment requirements. It ensures proper deallocation of aligned memory
+    /// blocks.
+    /// </summary>
+    /// <param name="ptr">The pointer to the memory block that needs to be freed.</param>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static void AlignedFree(void* ptr)
+    {
+        NativeMemory.AlignedFree(ptr);
+    }
+
     /// <summary>
     /// Clears a block of memory by setting it to zero. It initializes a specified number of bytes at a given memory
     /// address.
@@ -32,7 +102,7 @@ public static unsafe class MemoryUtilities
     /// <param name="size">The number of bytes to set to the specified value.</param>
     /// <param name="value">The byte value to which the memory block will be initialized.</param>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    public static void MemSet(void* ptr, nuint size, byte value)
+    public static void MemSet(void* ptr, byte value, nuint size)
     {
         NativeMemory.Fill(ptr, size, value);
     }

Misaki.HighPerformance.Unsafe/Helpers/UnsafeCollectionExtensions.cs

@@ -2,6 +2,10 @@
 
 namespace Misaki.HighPerformance.Unsafe.Helpers;
 
+/// <summary>
+/// Provides extension methods for copying elements between unsafe collections and spans, converting collections to
+/// arrays or lists, and searching for values.
+/// </summary>
 public unsafe static class UnsafeCollectionExtensions
 {
     /// <summary>
@@ -13,14 +17,37 @@ public unsafe static class UnsafeCollectionExtensions
     /// <exception cref="ArgumentException">Thrown when the sizes of the source collection and destination span do not match.</exception>
     public static void CopyTo<T>(this IUnsafeCollection<T> source, Span<T> destination) where T : unmanaged
     {
-        if (source.Size > destination.Length)
+        if (source.Count > destination.Length)
         {
             throw new ArgumentException("Source collection is larger than the destination span.");
         }
 
         fixed (T* ptr = destination)
         {
-            SystemUnsfae.CopyBlock(ptr, source.Buffer, (uint)(source.Size * sizeof(T)));
+            SystemUnsfae.CopyBlock(ptr, source.GetUnsafePtr(), (uint)(source.Count * sizeof(T)));
+        }
+    }
+
+    /// <summary>
+    /// Copies a range of elements from a source collection to a destination span, ensuring both are adequately sized.
+    /// </summary>
+    /// <typeparam name="T">Specifies the type of elements being copied, which must be a value type.</typeparam>
+    /// <param name="source">The collection from which elements are copied.</param>
+    /// <param name="destination">The span where the elements will be copied to.</param>
+    /// <param name="sourceIndex">The starting index in the source collection for the copy operation.</param>
+    /// <param name="destinationIndex">The starting index in the destination span where the elements will be placed.</param>
+    /// <param name="length">The number of elements to copy from the source to the destination.</param>
+    /// <exception cref="ArgumentException">Thrown when the specified range exceeds the bounds of the source collection or destination span.</exception>
+    public static void CopyTo<T>(this IUnsafeCollection<T> source, Span<T> destination, int sourceIndex, int destinationIndex, int length) where T : unmanaged
+    {
+        if (sourceIndex + length > source.Count || destinationIndex + length > destination.Length)
+        {
+            throw new ArgumentException("Source collection or destination span is too small for the specified range.");
+        }
+
+        fixed (T* ptr = destination)
+        {
+            SystemUnsfae.CopyBlock(ptr + destinationIndex, (byte*)source.GetUnsafePtr() + (sourceIndex * sizeof(T)), (uint)(length * sizeof(T)));
         }
     }
 
@@ -33,14 +60,37 @@ public unsafe static class UnsafeCollectionExtensions
     /// <exception cref="ArgumentException">Thrown when the source span and destination collection have different sizes.</exception>
     public static void CopyFrom<T>(this IUnsafeCollection<T> destination, Span<T> source) where T : unmanaged
     {
-        if (destination.Size > source.Length)
+        if (destination.Count > source.Length)
         {
             throw new ArgumentException("Destination collection is larger than the source span.");
         }
 
         fixed (T* ptr = source)
         {
-            SystemUnsfae.CopyBlock(destination.Buffer, ptr, (uint)(source.Length * sizeof(T)));
+            SystemUnsfae.CopyBlock(destination.GetUnsafePtr(), ptr, (uint)(source.Length * sizeof(T)));
+        }
+    }
+
+    /// <summary>
+    /// Copies a specified range of elements from a source span to a destination collection.
+    /// </summary>
+    /// <typeparam name="T">Represents the type of elements being copied, which must be unmanaged.</typeparam>
+    /// <param name="destination">The collection where elements will be copied to.</param>
+    /// <param name="source">The span containing the elements to be copied.</param>
+    /// <param name="sourceIndex">The starting index in the source span from which to begin copying.</param>
+    /// <param name="destinationIndex">The starting index in the destination collection where the elements will be placed.</param>
+    /// <param name="length">The number of elements to copy from the source span to the destination collection.</param>
+    /// <exception cref="ArgumentException">Thrown when the specified range exceeds the bounds of the source span or destination collection.</exception>
+    public static void CopyFrom<T>(this IUnsafeCollection<T> destination, Span<T> source, int sourceIndex, int destinationIndex, int length) where T : unmanaged
+    {
+        if (sourceIndex + length > source.Length || destinationIndex + length > destination.Count)
+        {
+            throw new ArgumentException("Source span or destination collection is too small for the specified range.");
+        }
+
+        fixed (T* ptr = source)
+        {
+            SystemUnsfae.CopyBlock((byte*)destination.GetUnsafePtr() + (destinationIndex * sizeof(T)), ptr + sourceIndex, (uint)(length * sizeof(T)));
         }
     }
 
@@ -52,10 +102,10 @@ public unsafe static class UnsafeCollectionExtensions
     /// <returns>A new collection containing the elements from the UnsafeCollection.</returns>
     public static T[] ToArray<T>(this IUnsafeCollection<T> source) where T : unmanaged
     {
-        var array = new T[source.Size];
+        var array = new T[source.Count];
         fixed (T* ptr = array)
         {
-            SystemUnsfae.CopyBlock(ptr, source.Buffer, (uint)(source.Size * sizeof(T)));
+            SystemUnsfae.CopyBlock(ptr, source.GetUnsafePtr(), (uint)(source.Count * sizeof(T)));
         }
 
         return array;
@@ -69,10 +119,10 @@ public unsafe static class UnsafeCollectionExtensions
     /// <returns>A list containing the elements from the specified unmanaged collection.</returns>
     public static List<T> ToList<T>(this IUnsafeCollection<T> source) where T : unmanaged
     {
-        var list = new List<T>(source.Size);
+        var list = new List<T>(source.Count);
         fixed (T* ptr = list.ToArray())
         {
-            SystemUnsfae.CopyBlock(ptr, source.Buffer, (uint)(source.Size * sizeof(T)));
+            SystemUnsfae.CopyBlock(ptr, source.GetUnsafePtr(), (uint)(source.Count * sizeof(T)));
         }
         return list;
     }
@@ -85,6 +135,39 @@ public unsafe static class UnsafeCollectionExtensions
     /// <returns>A Span that provides a view over the elements of the UnsafeCollection.</returns>
     public static Span<T> AsSpan<T>(this IUnsafeCollection<T> source) where T : unmanaged
     {
-        return new(source.Buffer, source.Size);
+        return new(source.GetUnsafePtr(), source.Count);
+    }
+
+    /// <summary>
+    /// Finds the index of a specified value in a collection. Returns -1 if the value is not found.
+    /// </summary>
+    /// <typeparam name="T">The type of elements in the collection, which must support equality comparison.</typeparam>
+    /// <param name="source">The collection to search for the specified value.</param>
+    /// <param name="value">The value to locate within the collection.</param>
+    /// <param name="index">Outputs the index of the found value or -1 if not found.</param>
+    public static void IndexOf<T>(this IUnsafeCollection<T> source, T value, out int index) where T : unmanaged, IEquatable<T>
+    {
+        for (var i = 0; i < source.Count; i++)
+        {
+            if (UnsafeUtilities.ReadArrayElement<T>(source.GetUnsafePtr(), i).Equals(value))
+            {
+                index = i;
+                return;
+            }
+        }
+        index = -1;
+    }
+
+    /// <summary>
+    /// Checks if a specified value exists within an unsafe collection of unmanaged types.
+    /// </summary>
+    /// <typeparam name="T">Represents a type that is unmanaged and supports equality comparison.</typeparam>
+    /// <param name="source">The collection being searched for the specified value.</param>
+    /// <param name="value">The value being searched for within the collection.</param>
+    /// <returns>Returns true if the value is found; otherwise, returns false.</returns>
+    public static bool Conations<T>(this IUnsafeCollection<T> source, T value) where T : unmanaged, IEquatable<T>
+    {
+        source.IndexOf(value, out var index);
+        return index != -1;
     }
 }

Misaki.HighPerformance.Unsafe/Helpers/UnsafeUtilities.cs

@@ -1,4 +1,5 @@
-using System.Runtime.CompilerServices;
+using Misaki.HighPerformance.Unsafe.Collections;
+using System.Runtime.CompilerServices;
 
 namespace Misaki.HighPerformance.Unsafe.Helpers;
 
@@ -79,4 +80,18 @@ public static unsafe class UnsafeUtilities
     {
         *ReadArrayElementUnsafe<T>(ptr, index) = value;
     }
+
+    /// <summary>
+    /// Converts an UnsafeArray of one unmanaged type to another unmanaged type without copying the elements.
+    /// </summary>
+    /// <typeparam name="TIn">Represents the type of elements in the input array.</typeparam>
+    /// <typeparam name="TOut">Represents the type of elements in the output array.</typeparam>
+    /// <param name="array">The input array containing elements of the specified input type.</param>
+    /// <returns>An UnsafeArray containing elements of the specified output type.</returns>
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static UnsafeArray<TOut> CastArray<TIn, TOut>(UnsafeArray<TIn> array)
+        where TIn : unmanaged where TOut : unmanaged
+    {
+        return new UnsafeArray<TOut>(array.GetUnsafePtr(), array.Count * sizeof(TIn) / sizeof(TOut));
+    }
 }

Misaki.HighPerformance.Unsafe/Misaki.HighPerformance.Unsafe.csproj

@@ -15,4 +15,8 @@
     <IsAotCompatible>True</IsAotCompatible>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\Misaki.HighPerformance.Math\Misaki.HighPerformance.Mathematics.csproj" />
+  </ItemGroup>
+
 </Project>

Misaki.HighPerformance.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Misaki.HighPerformance.Unsa
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Misaki.HighPerformance.Test", "Misaki.HighPerformance.Test\Misaki.HighPerformance.Test.csproj", "{90EFF5B8-22CD-4B6A-83AB-48E0E97610EA}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Misaki.HighPerformance.Mathematics", "Misaki.HighPerformance.Math\Misaki.HighPerformance.Mathematics.csproj", "{861F9574-2063-4B54-8D6A-AA32B26B6583}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{90EFF5B8-22CD-4B6A-83AB-48E0E97610EA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{90EFF5B8-22CD-4B6A-83AB-48E0E97610EA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{90EFF5B8-22CD-4B6A-83AB-48E0E97610EA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{861F9574-2063-4B54-8D6A-AA32B26B6583}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{861F9574-2063-4B54-8D6A-AA32B26B6583}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{861F9574-2063-4B54-8D6A-AA32B26B6583}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{861F9574-2063-4B54-8D6A-AA32B26B6583}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Misaki.HighPerformance/Buffer/ObjectPool.cs

@@ -8,9 +8,6 @@ namespace Misaki.HighPerformance.Buffer
         private readonly Func<T> _factory;
         private readonly ConcurrentQueue<T> _objects = new();
 
-        private readonly bool _autoCleanup;
-        private readonly int _autoCleanupInterval;
-
         private bool _disposed;
 
         public uint InitialSize
@@ -24,13 +21,10 @@ namespace Misaki.HighPerformance.Buffer
             private set;
         }
 
-        public ObjectPool(Func<T> factory, uint initialSize = uint.MinValue, uint maxSize = uint.MaxValue, bool autoCleanup = false, int autoCleanupInterval = 1000 * 60 * 5)
+        public ObjectPool(Func<T> factory, uint initialSize = uint.MinValue, uint maxSize = uint.MaxValue)
         {
             _factory = factory;
 
-            _autoCleanup = autoCleanup;
-            _autoCleanupInterval = autoCleanupInterval;
-
             InitialSize = initialSize;
             MaxSize = maxSize;
 
@@ -41,40 +35,11 @@ namespace Misaki.HighPerformance.Buffer
                     _objects.Enqueue(_factory());
                 }
             }
-
-            SetupAutoCleanup();
         }
 
-        private void PoolCleanup()
+        ~ObjectPool()
         {
-            foreach (var obj in _objects)
+            Dispose();
-            {
-                if (obj is IDisposable disposable)
-                {
-                    disposable.Dispose();
-                }
-            }
-
-            _objects.Clear();
-
-            GC.Collect();
-        }
-
-        private void SetupAutoCleanup()
-        {
-            if (!_autoCleanup)
-            {
-                return;
-            }
-
-            Task.Run(async () =>
-            {
-                while (true)
-                {
-                    await Task.Delay(_autoCleanupInterval);
-                    PoolCleanup();
-                }
-            });
         }
 
         public bool TryRent([MaybeNullWhen(false)] out T obj)
@@ -100,11 +65,32 @@ namespace Misaki.HighPerformance.Buffer
             }
         }
 
+        public void Reset()
+        {
+            foreach (var obj in _objects)
+            {
+                if (obj is IDisposable disposable)
+                {
+                    disposable.Dispose();
+                }
+            }
+
+            _objects.Clear();
+            GC.Collect();
+        }
+
         public void Dispose()
         {
-            PoolCleanup();
+            if (_disposed)
+            {
+                return;
+            }
+
+            Reset();
 
             _disposed = true;
+
+            GC.SuppressFinalize(this);
         }
     }
 }

Misaki.HighPerformance/Jobs/JobExtensions.cs

@@ -2,7 +2,8 @@
 
 public static class JobExtensions
 {
-    public static JobHandle Schedule<T>(this T job, bool preferLocal = false) where T : struct, IJob
+    public static JobHandle Schedule<T>(this T job, bool preferLocal = false)
+        where T : struct, IJob
     {
         var handle = new JobHandle(1);
         var worker = new JobWorker<T>(job, handle);
@@ -11,7 +12,8 @@ public static class JobExtensions
         return handle;
     }
 
-    public static JobHandle Schedule<T>(this T job, ReadOnlySpan<JobHandle> dependencies, bool preferLocal = false) where T : struct, IJob
+    public static JobHandle Schedule<T>(this T job, ReadOnlySpan<JobHandle> dependencies, bool preferLocal = false)
+        where T : struct, IJob
     {
         foreach (var dependency in dependencies)
         {
@@ -21,7 +23,8 @@ public static class JobExtensions
         return job.Schedule(preferLocal);
     }
 
-    public static JobHandle Schedule<T>(this T job, int length, int batchCount, bool preferLocal = false) where T : struct, IJobParallelFor
+    public static JobHandle Schedule<T>(this T job, int length, int batchCount, bool preferLocal = false)
+        where T : struct, IJobParallelFor
     {
         var batchSize = (length + batchCount - 1) / batchCount;
         var handle = new JobHandle(batchCount);
@@ -37,7 +40,8 @@ public static class JobExtensions
         return handle;
     }
 
-    public static JobHandle Schedule<T>(this T job, int length, int batchCount, ReadOnlySpan<JobHandle> dependencies, bool preferLocal = false) where T : struct, IJobParallelFor
+    public static JobHandle Schedule<T>(this T job, int length, int batchCount, ReadOnlySpan<JobHandle> dependencies, bool preferLocal = false)
+        where T : struct, IJobParallelFor
     {
         foreach (var dependency in dependencies)
         {

Misaki.HighPerformance/Jobs/JobWorker.cs

@@ -1,6 +1,7 @@
 namespace Misaki.HighPerformance.Jobs;
 
-internal readonly struct JobWorker<T>(T job, JobHandle handle) : IThreadPoolWorkItem where T : struct, IJob
+internal readonly struct JobWorker<T>(T job, JobHandle handle) : IThreadPoolWorkItem
+    where T : struct, IJob
 {
     public void Execute()
     {
@@ -9,7 +10,8 @@ internal readonly struct JobWorker<T>(T job, JobHandle handle) : IThreadPoolWork
     }
 }
 
-internal readonly struct ParallelJobWorker<T>(T job, JobHandle handle, int start, int end) : IThreadPoolWorkItem where T : struct, IJobParallelFor
+internal readonly struct ParallelJobWorker<T>(T job, JobHandle handle, int start, int end) : IThreadPoolWorkItem
+    where T : struct, IJobParallelFor
 {
     public void Execute()
     {