Initial Commit

Library/PackageCache/com.unity.multiplayer.mlapi@3e3aef6aa0/Runtime/Collections/FixedQueue.cs

@@ -0,0 +1,73 @@
+using System;
+
+namespace MLAPI.Collections
+{
+    /// <summary>
+    /// Queue with a fixed size
+    /// </summary>
+    /// <typeparam name="T">The type of the queue</typeparam>
+    public sealed class FixedQueue<T>
+    {
+        private readonly T[] m_Queue;
+        private int m_QueueCount = 0;
+        private int m_QueueStart;
+
+        /// <summary>
+        /// The amount of enqueued objects
+        /// </summary>
+        public int Count => m_QueueCount;
+
+        /// <summary>
+        /// Gets the element at a given virtual index
+        /// </summary>
+        /// <param name="index">The virtual index to get the item from</param>
+        /// <returns>The element at the virtual index</returns>
+        public T this[int index] => m_Queue[(m_QueueStart + index) % m_Queue.Length];
+
+        /// <summary>
+        /// Creates a new FixedQueue with a given size
+        /// </summary>
+        /// <param name="maxSize">The size of the queue</param>
+        public FixedQueue(int maxSize)
+        {
+            m_Queue = new T[maxSize];
+            m_QueueStart = 0;
+        }
+
+        /// <summary>
+        /// Enqueues an object
+        /// </summary>
+        /// <param name="t"></param>
+        /// <returns></returns>
+        public bool Enqueue(T t)
+        {
+            m_Queue[(m_QueueStart + m_QueueCount) % m_Queue.Length] = t;
+            if (++m_QueueCount > m_Queue.Length)
+            {
+                --m_QueueCount;
+                return true;
+            }
+
+            return false;
+        }
+
+        /// <summary>
+        /// Dequeues an object
+        /// </summary>
+        /// <returns></returns>
+        public T Dequeue()
+        {
+            if (--m_QueueCount == -1) throw new IndexOutOfRangeException("Cannot dequeue empty queue!");
+            T res = m_Queue[m_QueueStart];
+            m_QueueStart = (m_QueueStart + 1) % m_Queue.Length;
+            return res;
+        }
+
+        /// <summary>
+        /// Gets the element at a given virtual index
+        /// </summary>
+        /// <param name="index">The virtual index to get the item from</param>
+        /// <returns>The element at the virtual index</returns>
+        public T ElementAt(int index) => m_Queue[(m_QueueStart + index) % m_Queue.Length];
+    }
+}