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I do a similar thing by using the globals table.  I load all the
functionality I want and then save a reference in C to the globals.  then I
install a empty globals table (making the old one inaccessible from Lua) and
do a *shallow* copy of all the entries from the saved state to the new
globals.  Then after running scripts that could corrupt the state I reset by
installing a new globals table and doing a shallow copy to it.

Doesn't solve the general problem of course but it works for all non-table
globals.  And is faster than recreating the original state.


> From: Ignacio Castaño <>
> Reply-To:
> Date: Tue, 12 Feb 2002 18:46:20 +0100
> To: Multiple recipients of list <>
> Subject: Re: Clone a Lua State
> Jean Claude Morlier wrote:
>> I'm interesting by the way that you resolve it.
>> I would appreciate that you tell me how. You can contact me in a private
>> thread If you want.
>> I have also a do it in a different way. But I have some difficulties to
>> propagate function and tag to cloned state.
> I just kept all the modifications in a table so that after running the
> script I could clean the results with ease (table=nil). I know it's not
> completely safe, but it was ok for me.
> Ignacio Castaño
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