Added Entityx to project

external/entityx-1.1.2/entityx/help/Timer.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2013 Antony Woods <antony@teamwoods.org>
+ * All rights reserved.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution.
+ *
+ * Author: Antony Woods <antony@teamwoods.org>
+ */
+#pragma once
+
+#include <chrono>
+
+namespace entityx {
+namespace help {
+
+class Timer {
+public:
+  Timer();
+  ~Timer();
+
+  void restart();
+  double elapsed();
+private:
+  std::chrono::time_point<std::chrono::system_clock> _start;
+};
+
+}  // namespace help
+}  // namespace entityx