Added pool

Author: Thundernerd

Editor/ConstrainedRectPool.cs

@@ -0,0 +1,34 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace TNRD.Constraints
+{
+    internal static class ConstrainedRectPool
+    {
+        private static List<ConstrainedRect> available = new List<ConstrainedRect>();
+
+        public static ConstrainedRect Create(Rect to)
+        {
+            if (available.Count == 0)
+            {
+                return CreateNew(to);
+            }
+
+            var constrainedRect = available[0];
+            available.Remove(constrainedRect);
+            constrainedRect.Reset(to);
+            return constrainedRect;
+        }
+
+        private static ConstrainedRect CreateNew(Rect to)
+        {
+            var constrainedRect = new ConstrainedRect(to);
+            return constrainedRect;
+        }
+
+        public static void Return(ConstrainedRect constrainedRect)
+        {
+            available.Add(constrainedRect);
+        }
+    }
+}