Re: Garbage collection of userdata inside userdata

It was thus said that the Great 'Stefano Cossu' via lua-l once stated:
> Hello,

  Hello.

> Which approach shall I use? I guess I'd want to prevent the independent 
> term set from ever being garbage collected. I can't use a light userdata 
> pointer because the access function must return a full usable Lua 
> object. I also shouldn't duplicate the term set because it's expensive 
> and the two copies could fall out of sync, which is undesirable.

  You might want to add a reference to the TermSet to the DataSet using
LUA_REGISTRYINDEX with the luaL_ref() and luaL_unref() functions.  Using
luaL_ref() will anchor the TermSet until luaL_unref() is called which will
then allow the TermSet to be GCed.

  -spc

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