Made Valued optional for traits who do not require it.

OpenRA.Mods.Common/Activities/Repair.cs

@@ -98,7 +98,8 @@ namespace OpenRA.Mods.Common.Activities
 
 			if (remainingTicks == 0)
 			{
-				var unitCost = self.Info.TraitInfo<ValuedInfo>().Cost;
+				var valued = self.Info.TraitInfoOrDefault<ValuedInfo>();
+				var unitCost = valued != null ? valued.Cost : 0;
 				var hpToRepair = repairable != null && repairable.Info.HpPerStep > 0 ? repairable.Info.HpPerStep : repairsUnits.Info.HpPerStep;
 
 				// Cast to long to avoid overflow when multiplying by the health

OpenRA.Mods.Common/Traits/GainsExperience.cs

@@ -19,7 +19,7 @@ using OpenRA.Traits;
 namespace OpenRA.Mods.Common.Traits
 {
 	[Desc("This actor's experience increases when it has killed a GivesExperience actor.")]
-	public class GainsExperienceInfo : ITraitInfo, Requires<ValuedInfo>
+	public class GainsExperienceInfo : ITraitInfo
 	{
 		[FieldLoader.Require]
 		[Desc("Condition to grant at each level.",
@@ -33,6 +33,9 @@ namespace OpenRA.Mods.Common.Traits
 		[Desc("Palette for the level up sprite.")]
 		[PaletteReference] public readonly string LevelUpPalette = "effect";
 
+		[Desc("Multiplier to apply to the Conditions keys. Defaults to the actor's value.")]
+		public readonly int ExperienceModifier = -1;
+
 		[Desc("Should the level-up animation be suppressed when actor is created?")]
 		public readonly bool SuppressLevelupAnimation = true;
 
@@ -63,9 +66,6 @@ namespace OpenRA.Mods.Common.Traits
 			this.info = info;
 
 			MaxLevel = info.Conditions.Count;
-			var cost = self.Info.TraitInfo<ValuedInfo>().Cost;
-			foreach (var kv in info.Conditions)
-				nextLevel.Add(Pair.New(kv.Key * cost, kv.Value));
 
 			if (init.Contains<ExperienceInit>())
 				initialExperience = init.Get<ExperienceInit, int>();
@@ -73,6 +73,11 @@ namespace OpenRA.Mods.Common.Traits
 
 		void INotifyCreated.Created(Actor self)
 		{
+			var valued = self.Info.TraitInfoOrDefault<ValuedInfo>();
+			var requiredExperience = info.ExperienceModifier < 0 ? (valued != null ? valued.Cost : 1) : info.ExperienceModifier;
+			foreach (var kv in info.Conditions)
+				nextLevel.Add(Pair.New(kv.Key * requiredExperience, kv.Value));
+
 			conditionManager = self.TraitOrDefault<ConditionManager>();
 			if (initialExperience > 0)
 				GiveExperience(initialExperience, info.SuppressLevelupAnimation);

OpenRA.Mods.Common/Traits/SpawnActorsOnSell.cs

@@ -69,7 +69,15 @@ namespace OpenRA.Mods.Common.Traits
 			var buildingInfo = self.Info.TraitInfoOrDefault<BuildingInfo>();
 
 			var eligibleLocations = buildingInfo != null ? buildingInfo.Tiles(self.Location).ToList() : new List<CPos>();
-			var actorTypes = Info.ActorTypes.Select(a => new { Name = a, Cost = self.World.Map.Rules.Actors[a].TraitInfo<ValuedInfo>().Cost }).ToList();
+			var actorTypes = Info.ActorTypes.Select(a =>
+			{
+				var av = self.World.Map.Rules.Actors[a].TraitInfoOrDefault<ValuedInfo>();
+				return new
+				{
+					Name = a,
+					Cost = av != null ? av.Cost : 0
+				};
+			}).ToList();
 
 			while (eligibleLocations.Count > 0 && actorTypes.Any(a => a.Cost <= dudesValue))
 			{

OpenRA.Mods.Common/Widgets/Logic/Ingame/ProductionTooltipLogic.cs

@@ -70,7 +70,8 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 				var tooltip = actor.TraitInfos<TooltipInfo>().FirstOrDefault(info => info.EnabledByDefault);
 				var name = tooltip != null ? tooltip.Name : actor.Name;
 				var buildable = actor.TraitInfo<BuildableInfo>();
-				var cost = actor.TraitInfo<ValuedInfo>().Cost;
+				var valued = actor.TraitInfoOrDefault<ValuedInfo>();
+				var cost = valued != null ? valued.Cost : 0;
 
 				nameLabel.Text = name;