67 lines
1.5 KiB
C#
67 lines
1.5 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
|
|
namespace ZXL
|
|
{
|
|
|
|
public static class ListPool<T>
|
|
{
|
|
private static readonly object @lock = new object();
|
|
private static readonly Stack<List<T>> free = new Stack<List<T>>();
|
|
private static readonly HashSet<List<T>> busy = new HashSet<List<T>>();
|
|
|
|
public static List<T> New()
|
|
{
|
|
lock (@lock)
|
|
{
|
|
if (free.Count == 0)
|
|
{
|
|
free.Push(new List<T>());
|
|
}
|
|
|
|
var array = free.Pop();
|
|
|
|
busy.Add(array);
|
|
|
|
return array;
|
|
}
|
|
}
|
|
|
|
public static void Free(List<T> list)
|
|
{
|
|
lock (@lock)
|
|
{
|
|
if (!busy.Contains(list))
|
|
{
|
|
throw new ArgumentException("The list to free is not in use by the pool.", nameof(list));
|
|
}
|
|
|
|
list.Clear();
|
|
|
|
busy.Remove(list);
|
|
|
|
free.Push(list);
|
|
}
|
|
}
|
|
}
|
|
|
|
public static class XListPool
|
|
{
|
|
public static List<T> ToListPooled<T>(this IEnumerable<T> source)
|
|
{
|
|
var list = ListPool<T>.New();
|
|
|
|
foreach (var item in source)
|
|
{
|
|
list.Add(item);
|
|
}
|
|
|
|
return list;
|
|
}
|
|
|
|
public static void Free<T>(this List<T> list)
|
|
{
|
|
ListPool<T>.Free(list);
|
|
}
|
|
}
|
|
} |