lua user data objects and interfacing c++

["Robert Sadedin" <trinitychaos50@...>]

I am storing a c++ object in a lua user data, and binding a meta table to it 
for lookup on method calls.
The user data stores the pointer for the c++ object instance, and some other 
information such as whether lua will handle the freeing of the object or 
not, and the meta table, of course.

What I would like to do is allow a user to add lua variables to these c++ 
objects wrapped by a user data and accessed through the meta table.

Currently a user can call, for instance:
obj = createSomeObject()
print(obj:getCVariable1())

I'd like the user to be able to say:
obj.x = 6
print(obj.x)

I'm not sure if this can be achieved, though, since obj is simply a user 
data, and a lookup in the meta table will reveal nothing regarding x.
I could, on an unfound interface, modify the metatable, I guess ...  I'm not 
really sure though, and was wondering what others  though of as a good 
solution, if they have one.

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