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yyl

2025-05-15 aac116baba3b0c43808e05458c2d4793a0729730

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#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
 
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
 
namespace Cysharp.Threading.Tasks.Internal
{
    internal static class ArrayPoolUtil
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        internal static void EnsureCapacity<T>(ref T[] array, int index, ArrayPool<T> pool)
        {
            if (array.Length <= index)
            {
                EnsureCapacityCore(ref array, index, pool);
            }
        }
 
        [MethodImpl(MethodImplOptions.NoInlining)]
        static void EnsureCapacityCore<T>(ref T[] array, int index, ArrayPool<T> pool)
        {
            if (array.Length <= index)
            {
                var newSize = array.Length * 2;
                var newArray = pool.Rent((index < newSize) ? newSize : (index * 2));
                Array.Copy(array, 0, newArray, 0, array.Length);
 
                pool.Return(array, clearArray: !RuntimeHelpersAbstraction.IsWellKnownNoReferenceContainsType<T>());
 
                array = newArray;
            }
        }
 
        public static RentArray<T> Materialize<T>(IEnumerable<T> source)
        {
            if (source is T[] array)
            {
                return new RentArray<T>(array, array.Length, null);
            }
 
            var defaultCount = 32;
            if (source is ICollection<T> coll)
            {
                if (coll.Count == 0)
                {
                    return new RentArray<T>(Array.Empty<T>(), 0, null);
                }
 
                defaultCount = coll.Count;
                var pool = ArrayPool<T>.Shared;
                var buffer = pool.Rent(defaultCount);
                coll.CopyTo(buffer, 0);
                return new RentArray<T>(buffer, coll.Count, pool);
            }
            else if (source is IReadOnlyCollection<T> rcoll)
            {
                defaultCount = rcoll.Count;
            }
 
            if (defaultCount == 0)
            {
                return new RentArray<T>(Array.Empty<T>(), 0, null);
            }
 
            {
                var pool = ArrayPool<T>.Shared;
 
                var index = 0;
                var buffer = pool.Rent(defaultCount);
                foreach (var item in source)
                {
                    EnsureCapacity(ref buffer, index, pool);
                    buffer[index++] = item;
                }
 
                return new RentArray<T>(buffer, index, pool);
            }
        }
 
        public struct RentArray<T> : IDisposable
        {
            public readonly T[] Array;
            public readonly int Length;
            ArrayPool<T> pool;
 
            public RentArray(T[] array, int length, ArrayPool<T> pool)
            {
                this.Array = array;
                this.Length = length;
                this.pool = pool;
            }
 
            public void Dispose()
            {
                DisposeManually(!RuntimeHelpersAbstraction.IsWellKnownNoReferenceContainsType<T>());
            }
 
            public void DisposeManually(bool clearArray)
            {
                if (pool != null)
                {
                    if (clearArray)
                    {
                        System.Array.Clear(Array, 0, Length);
                    }
 
                    pool.Return(Array, clearArray: false);
                    pool = null;
                }
            }
        }
    }
}