And then everything became one

osu.Game/Beatmaps/BeatmapProcessor.cs

@@ -0,0 +1,24 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Rulesets.Objects;
+
+namespace osu.Game.Beatmaps
+{
+    /// <summary>
+    /// Processes a post-converted Beatmap.
+    /// </summary>
+    /// <typeparam name="TObject">The type of HitObject contained in the Beatmap.</typeparam>
+    public class BeatmapProcessor<TObject>
+        where TObject : HitObject
+    {
+        /// <summary>
+        /// Post-processes a Beatmap to add mode-specific components that aren't added during conversion.
+        /// <para>
+        /// An example of such a usage is for combo colours.
+        /// </para>
+        /// </summary>
+        /// <param name="beatmap">The Beatmap to process.</param>
+        public virtual void PostProcess(Beatmap<TObject> beatmap) { }
+    }
+}