Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono/Empty.cs

@@ -0,0 +1,54 @@
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2015 Jb Evain
+// Copyright (c) 2008 - 2011 Novell, Inc.
+//
+// Licensed under the MIT/X11 license.
+//
+
+using System;
+using Mono.Collections.Generic;
+
+namespace Mono {
+
+	static class Empty<T> {
+
+		public static readonly T [] Array = new T [0];
+	}
+}
+
+namespace Mono.Cecil {
+
+	static partial class Mixin {
+
+		public static bool IsNullOrEmpty<T> (this T [] self)
+		{
+			return self == null || self.Length == 0;
+		}
+
+		public static bool IsNullOrEmpty<T> (this Collection<T> self)
+		{
+			return self == null || self.size == 0;
+		}
+
+		public static T [] Resize<T> (this T [] self, int length)
+		{
+			Array.Resize (ref self, length);
+			return self;
+		}
+
+		public static T [] Add<T> (this T [] self, T item)
+		{
+			if (self == null) {
+				self = new [] { item };
+				return self;
+			}
+
+			self = self.Resize (self.Length + 1);
+			self [self.Length - 1] = item;
+			return self;
+		}
+	}
+}