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