Question

How would I pass a table of unknown length from Lua into a bound C++ function?

I want to be able to call the Lua function like this:

call_C_Func({1,1,2,3,5,8,13,21})

And copy the table contents into an array (preferably STL vector)?

Answer 1

If you use LuaBind it’s as simple as one registered call. As for rolling up your own, you need to take a look at lua_next function.

Basically the code is as follows:

lua_pushnil(state); // first key
index = lua_gettop(state);
while ( lua_next(state,index) ) { // traverse keys
  something = lua_tosomething(state,-1); // tonumber for example
  results.push_back(something);
  lua_pop(state,1); // stack restore
}