1 files changed, 59 insertions, 0 deletions
diff --git a/V3/Objects/IdGenerator.cs b/V3/Objects/IdGenerator.cs
new file mode 100644
index 0000000..08976ca
--- /dev/null
+++ b/V3/Objects/IdGenerator.cs
@@ -0,0 +1,59 @@
+using System;
+
+namespace V3.Objects
+{
+    /// <summary>
+    /// Static helper class that generates unique IDs for game objects.
+    /// </summary>
+    // ReSharper disable once ClassNeverInstantiated.Global
+    public sealed class IdGenerator
+    {
+        private static int sCurrentId;
+
+        private static int? sIdOnce;
+
+        private IdGenerator()
+        {
+            throw new NotImplementedException();
+        }
+
+        /// <summary>
+        /// Get an ID for a new game object.
+        /// </summary>
+        /// <returns>the ID to use for a new game object</returns>
+        public static int GetNextId()
+        {
+            int id;
+            if (sIdOnce.HasValue)
+            {
+                id = sIdOnce.Value;
+                ClearIdOnce();
+            }
+            else
+            {
+                id = sCurrentId;
+                sCurrentId++;
+            }
+
+            return id;
+        }
+
+        /// <summary>
+        /// Sets the ID to use only for the next object that is created.
+        /// </summary>
+        /// <param name="id">the id for the next object</param>
+        public static void SetIdOnce(int id)
+        {
+            sIdOnce = id;
+        }
+
+        /// <summary>
+        /// Clear the ID stored by SetIdOnce that is used only for the
+        /// next object.
+        /// </summary>
+        public static void ClearIdOnce()
+        {
+            sIdOnce = null;
+        }
+    }
+}