Reorganise FileFormats

OpenRA.FileFormats/Primitives/Lazy.cs

@@ -0,0 +1,56 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+
+namespace OpenRA.FileFormats
+{
+	public class Lazy<T>
+	{
+		Func<T> p;
+		T value;
+
+		public Lazy(Func<T> p)
+		{
+			if (p == null)
+				throw new ArgumentNullException();
+
+			this.p = p;
+		}
+
+		public T Value
+		{
+			get
+			{
+				if (p == null)
+					return value;
+
+				value = p();
+				p = null;
+				return value;
+			}
+		}
+	}
+
+	public static class Lazy
+	{
+		public static Lazy<T> New<T>(Func<T> p) { return new Lazy<T>(p); }
+	}
+}