enhance Cache to allow specializing the key comparer

Author: chrisforbes

OpenRA.FileFormats/Primitives/Cache.cs

@@ -15,17 +15,21 @@
 namespace OpenRA.FileFormats
 {
 	public class Cache<T, U> : IEnumerable<KeyValuePair<T, U>>
-	{
-		Dictionary<T, U> hax = new Dictionary<T, U>();
+	{
+		Dictionary<T, U> hax;
 		Func<T,U> loader;
 
-		public Cache(Func<T,U> loader)
+		public Cache(Func<T,U> loader, IEqualityComparer<T> c)
 		{
+			hax = new Dictionary<T, U>(c);
 			if (loader == null)
 				throw new ArgumentNullException();
 
 			this.loader = loader;
-		}
+		}
+
+		public Cache(Func<T, U> loader)
+			: this(loader, EqualityComparer<T>.Default) { }
 
 		public U this[T key]
 		{