112 lines
3.4 KiB
C#
112 lines
3.4 KiB
C#
#if CSHARP_7_OR_LATER || (UNITY_2018_3_OR_NEWER && (NET_STANDARD_2_0 || NET_4_6))
|
|
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
|
|
|
|
using System;
|
|
using System.Collections.Generic;
|
|
using System.Runtime.CompilerServices;
|
|
|
|
namespace UniRx.Async.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 = 4;
|
|
if (source is ICollection<T> coll)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif |