how to store a ref to a table without registry?

[joerg piringer <joerg@...>]

hallo all,
i am pretty new to lua so please forgive me if this question has been 
asked before:
i'd like to access a function (or rather a method) inside a specific 
table from c++. how can i do that without storing the reference to the 
table in the registry?
the problem is when i store the reference in the registry it won't get 
garbage collected, right?

i have the following code:

o = TestObject()
o.testFunc = function() print "test" end

TestObject() is a c++ function that returns a table with a userdata 
inside (the actual c++ object).
now i'd like to call my testFunc from the c++ object that's inside the 
table.
i did it with a reference (in the registry) to self (the table) until i 
tried to garbage collect the objects...

best
joerg

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