chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
@@ -0,0 +1,59 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+using System.Collections.Generic;
+
+namespace QuantConnect.Util 
+{
+    /// <summary>
+    /// Helper method for a limited length queue which self-removes the extra elements.
+    /// http://stackoverflow.com/questions/5852863/fixed-size-queue-which-automatically-dequeues-old-values-upon-new-enques
+    /// </summary>
+    /// <typeparam name="T">The type of item the queue holds</typeparam>
+    public class FixedSizeQueue<T> : Queue<T>
+    {
+        private int _limit = -1;
+
+        /// <summary>
+        /// Max Length 
+        /// </summary>
+        public int Limit
+        {
+            get { return _limit; }
+            set { _limit = value; }
+        }
+
+        /// <summary>
+        /// Create a new fixed length queue:
+        /// </summary>
+        public FixedSizeQueue(int limit)
+            : base(limit)
+        {
+            Limit = limit;
+        }
+
+        /// <summary>
+        /// Enqueue a new item int the generic fixed length queue:
+        /// </summary>
+        public new void Enqueue(T item)
+        {
+            while (Count >= Limit)
+            {
+                Dequeue();
+            }
+            base.Enqueue(item);
+        }
+    }
+}