Lua - Reflection - Get list of functions/fields on an object?

Question

I'm new to Lua and dealing with Lua as a scripting language in an alpha release of a program. The developer is unresponsive and I need to get a list of functions provided by some C++ objects which are accessible from the Lua code.

Is there any easy way to see what fields and functions these objects expose?

Answer 1

In Lua, to view the members of a object, you can use:

for key,value in pairs(o) do
    print("found member " .. key);
end

Unfortunately I don't know if this will work for objects imported from C++.

Answer 2

If allowed in the environment, looking at the metatable of the exported C++ object can help:

for key,value in pairs(getmetatable(o)) do
    print(key, value)
end