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Assets/UniRx.Async/Internal/StatePool.cs

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+using System;
+using System.Collections.Concurrent;
+using System.Runtime.CompilerServices;
+
+namespace UniRx.Async.Internal
+{
+    internal static class StateTuple
+    {
+        public static StateTuple<T1, T2> Create<T1, T2>(T1 item1, T2 item2)
+        {
+            return StatePool<T1, T2>.Create(item1, item2);
+        }
+    }
+
+    internal class StateTuple<T1, T2> : IDisposable
+    {
+        public T1 Item1;
+        public T2 Item2;
+
+        public void Deconstruct(out T1 item1, out T2 item2)
+        {
+            item1 = this.Item1;
+            item2 = this.Item2;
+        }
+
+        public void Dispose()
+        {
+            StatePool<T1, T2>.Return(this);
+        }
+    }
+
+    internal static class StatePool<T1, T2>
+    {
+        static readonly ConcurrentQueue<StateTuple<T1, T2>> queue = new ConcurrentQueue<StateTuple<T1, T2>>();
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static StateTuple<T1, T2> Create(T1 item1, T2 item2)
+        {
+            if (queue.TryDequeue(out var value))
+            {
+                value.Item1 = item1;
+                value.Item2 = item2;
+                return value;
+            }
+
+            return new StateTuple<T1, T2> { Item1 = item1, Item2 = item2 };
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void Return(StateTuple<T1, T2> tuple)
+        {
+            tuple.Item1 = default;
+            tuple.Item2 = default;
+            queue.Enqueue(tuple);
+        }
+    }
+}