Add a base interface for applicable mods

osu.Game/Rulesets/Mods/IApplicableMod.cs

@@ -0,0 +1,10 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+namespace osu.Game.Rulesets.Mods
+{
+    // The base interface for a mod which can be applied in some way.
+    public interface IApplicableMod
+    {
+    }
+}

osu.Game/Rulesets/Mods/IApplicableToClock.cs

@@ -8,8 +8,8 @@ namespace osu.Game.Rulesets.Mods
     /// <summary>
     /// An interface for mods that make adjustments to the track.
     /// </summary>
-    public interface IApplicableToClock
+    public interface IApplicableToClock : IApplicableMod
     {
         void ApplyToClock(IAdjustableClock clock);
     }
-}
+}

osu.Game/Rulesets/Mods/IApplicableToDifficulty.cs

@@ -8,8 +8,8 @@ namespace osu.Game.Rulesets.Mods
     /// <summary>
     /// An interface for mods that make general adjustments to difficulty.
     /// </summary>
-    public interface IApplicableToDifficulty
+    public interface IApplicableToDifficulty : IApplicableMod
     {
         void ApplyToDifficulty(BeatmapDifficulty difficulty);
     }
-}
+}

osu.Game/Rulesets/Mods/IApplicableToDrawableHitObject.cs

@@ -9,7 +9,7 @@ namespace osu.Game.Rulesets.Mods
     /// <summary>
     /// An interface for <see cref="Mod"/>s that can be applied to <see cref="DrawableHitObject"/>s.
     /// </summary>
-    public interface IApplicableToDrawableHitObjects
+    public interface IApplicableToDrawableHitObjects : IApplicableMod
     {
         /// <summary>
         /// Applies this <see cref="IApplicableToDrawableHitObjects"/> to a list of <see cref="DrawableHitObject"/>s.

osu.Game/Rulesets/Mods/IApplicableToHitObject.cs

@@ -8,7 +8,7 @@ namespace osu.Game.Rulesets.Mods
     /// <summary>
     /// An interface for <see cref="Mod"/>s that can be applied to <see cref="HitObject"/>s.
     /// </summary>
-    public interface IApplicableToHitObject<in TObject>
+    public interface IApplicableToHitObject<in TObject> : IApplicableMod
         where TObject : HitObject
     {
         /// <summary>

osu.Game/Rulesets/Mods/IApplicableToRulesetContainer.cs

@@ -9,7 +9,7 @@ namespace osu.Game.Rulesets.Mods
     /// <summary>
     /// An interface for <see cref="Mod"/>s that can be applied to <see cref="RulesetContainer"/>s.
     /// </summary>
-    public interface IApplicableToRulesetContainer<TObject>
+    public interface IApplicableToRulesetContainer<TObject> : IApplicableMod
         where TObject : HitObject
     {
         /// <summary>

osu.Game/Rulesets/Mods/IApplicableToScoreProcessor.cs

@@ -8,7 +8,7 @@ namespace osu.Game.Rulesets.Mods
     /// <summary>
     /// An interface for mods that make general adjustments to score processor.
     /// </summary>
-    public interface IApplicableToScoreProcessor
+    public interface IApplicableToScoreProcessor : IApplicableMod
     {
         void ApplyToScoreProcessor(ScoreProcessor scoreProcessor);
     }

osu.Game/Rulesets/Mods/Mod.cs

@@ -41,6 +41,11 @@ namespace osu.Game.Rulesets.Mods
         /// </summary>
         public abstract double ScoreMultiplier { get; }
 
+        /// <summary>
+        /// Returns true if this mod is implemented (and playable).
+        /// </summary>
+        public virtual bool HasImplementation => this is IApplicableMod;
+
         /// <summary>
         /// Returns if this mod is ranked.
         /// </summary>

osu.Game/osu.Game.csproj

@@ -310,6 +310,7 @@
     <Compile Include="Overlays\Profile\Sections\Ranks\DrawableTotalScore.cs" />
     <Compile Include="Overlays\Profile\Sections\Ranks\ScoreModsContainer.cs" />
     <Compile Include="Overlays\Settings\Sections\Maintenance\DeleteAllBeatmapsDialog.cs" />
+    <Compile Include="Rulesets\Mods\IApplicableMod.cs" />
     <Compile Include="Rulesets\Mods\IApplicableToDrawableHitObject.cs" />
     <Compile Include="Screens\Select\ImportFromStablePopup.cs" />
     <Compile Include="Overlays\Settings\SettingsButton.cs" />