Now have more fancy rooms with different floors to play with.

scratchpad/luatest.cpp

@@ -1,17 +1,26 @@
 #define SOL_ALL_SAFETIES_ON 1
 #include <sol/sol.hpp>
-
+#include <cassert>
 #include <iostream>
+#include <fmt/core.h>
+#include "components.hpp"
+
+using namespace fmt;
+using namespace components;
 
 int main(int, char*[]) {
   std::cout << "=== opening a state ===" << std::endl;
 
   sol::state lua;
-  // open some common libraries
-  lua.open_libraries(sol::lib::base, sol::lib::package);
-  lua.script("print('bark bark bark!')");
+  lua.open_libraries(sol::lib::base);
+  auto motion = Motion{1, -1};
+  lua.new_usertype<Motion>("Motion",
+      "dx", &Motion::dx,
+      "dy", &Motion::dy
+  );
 
-  std::cout << std::endl;
+  lua["motion"] = &motion;
 
+  lua.script("print('dx', motion.dx, 'dy', motion.dy)");
   return 0;
 }