Working with table from C++

[Eugen-Andrei Gavriloaie <shiretu@...>]

Hi,

It might sound stupid, but it seems that I can't find a way to iterate  
through a table in c++. Suppose we have a table pushed onto the stack  
(lua calls a c++ function and passes all the parameters using a table:  
key/value pairs). How do I iterate on that table (present on the top  
of stack) in c++? I need both elements (key and value).

Please don't make fun of me now because I think I'll try to scratch  
with my left on the right side of my head .... :)

One approach would be to globalize the table from the stack by giving  
it a name using lua_setglobal and after that evaluate a generated lua  
script like this:

for k,v in pairs(_some_random_name) do
	call_another_cpp_function_that_handles_only_one_row_in_the_table(k,v)
end

evaluation is made using lua_loadstring()/lua_pcall()

After this, we can use lua_setglobal again to set `_some_random_name`  
to nil and make the table available for GC.

But this is a huuuuge implementation overhead IMHO, because you must  
keep a state in c++ outside the function  
call_another_cpp_function_that_handles_only_one_row_in_the_table  
(store the key/value pair (now present on the stack like 2 distinct  
elements, easy to pick up) into a more c++ manageable form like a  
vector or a map). Is there another better solution to this problem?

Thank you