Get table from c++ lua reference index in lua

Question

first sorry for the weired title:( I am using lua as a scripting languge for my game and I have a problem: I am creating lua table instances and storing them in indices "ref_idx " like this:

lua_newtable(L);
lua_getglobal(L, "TestTable"); // create instance of table "TestTable"
lua_pcall(L, 0, 1, 0);
ref_idx = luaL_ref(L, LUA_REGISTRYINDEX);

and when i want to call a method of one of them I use:

lua_rawgeti(L, LUA_REGISTRYINDEX, ref_idx);
lua_getfield(L, -1, "testMethod");
lua_pushvalue(L, -2);
lua_pcall(L, 1, 0, 0));
lua_pop(L, 0);

when I am done with the reference:

luaL_unref(L, LUA_REGISTRYINDEX, ref_idx);

Every thing works fine, the problem is I want to use these reference in lua directly something like:

function onUpdate()
   local ref = GetReferenceFromC++() -- returns ref_idx 
   ref:testMethod()
end

Any help or a way to do it? (sorry for my english, I am working on it)

Answer 1

I used debug.getregistry()[ref]:testMethod() and it works, Thank you @EgorSkriptunoff for your quick response.