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On Wed, Jun 22, 2011 at 9:41 AM, Xavier Wang <> wrote:
> I know I can make a table in registry to record the dependence of A and B,
> but it wastes memory, and you can't collect the memory in a table has
> dead-key, even it's a weak table!

If you are really so worried about this you could periodically call
something that copies the current contents of the dependence table to
a new table and replaces it in the registry.

> So is there any other way to tell lua this
> dependence?

No, since you rule out environment tables I don't believe there is any
other way than using a weak table.