userdata metatable is loaded smoothly

server/userdata.cpp

@@ -23,7 +23,30 @@
 
 #include <iostream>
 
-int userdataIndex(lua_State* L) {
+static int index(lua_State* L) {
 	std::cout << "WARNING: userdataIndex called" << std::endl;
+	return 0;
+}
+
+static luaL_Reg metatable[] = {
+	{"__index", index},
+	{nullptr, nullptr}
+};
+
+int createUserdataMetatable(lua_State* L) {
+	//create the userdata metatable
+	lua_pushlightuserdata(L, nullptr); //anon userdata
+	lua_createtable(L, 0, 0); //table
+
+	for (luaL_Reg* it = metatable; it->name; it++) {
+		lua_pushstring(L, it->name);
+		lua_pushcfunction(L, it->func);
+		lua_settable(L, -3);
+	}
+
+	//set in the object & pop the anon userdata
+	lua_setmetatable(L, -2); //set the metatable for userdata
+	lua_pop(L, 1); //pop the anon userdata
+
 	return 0;
 }