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+// LuaUtil: Various additional functions for working with lua
+// Copyright (C) 2011 Pavel Labath
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef FBTK_LUAUTIL_HH
+#define FBTK_LUAUTIL_HH
+
+#include <vector>
+
+#include "Luamm.hh"
+
+namespace FbTk {
+
+/*
+ * This class augments lua::state with additional functions/features. Every object automatically
+ * calls registered init functions, which can be used to initialize/create global variables in
+ * the lua state. Functions can be registered by calling registerInitFunction or by creating
+ * objects of type RegisterInitFunction.
+ */
+class Lua: public lua::state {
+public:
+    Lua();
+
+    /* 
+     * makeReadOnly() makes the table at the specified index "read only". This means that any
+     * attempt to modify a table entry will result in an error (if only_existing_fields is
+     * false). If only_existing_fields is true then only fields that were present at the time of
+     * the call will be protected - user can add new entries and modify them afterwards. You
+     * should avoid raw access to "read only" tables -- it might not do what you think it will.
+     */
+    void makeReadOnly(int index, bool only_existing_fields = false);
+
+    /* 
+     * readOnlySet() is the equivalent of settable, except that it works on "read only" tables.
+     * It can be used to modify protected entries or create new ones.
+     */
+    void readOnlySet(int index);
+
+    template<typename Functor>
+    static void registerInitFunction(const Functor &fn) {
+        s_init_functions.push_back(new SlotImpl<Functor, void, Lua &>(fn));
+    }
+
+    class RegisterInitFunction {
+    public:
+        template<typename Functor>
+        RegisterInitFunction(const Functor &fn) {
+            registerInitFunction(fn);
+        }
+    };
+
+private:
+    typedef Slot<void, Lua &> InitFunction;
+    typedef std::vector<InitFunction *> InitFunctions;
+
+    static InitFunctions s_init_functions;
+};
+
+} // namespace FbTk
+
+#endif // FBTK_LUAUTIL_HH