Re: Lua Technical Note #6 & "chaining" a function to the GC cycle

[roberto@... (Roberto Ierusalimschy)]

> The Lua Technical Note #6 says:
> "Instead of calling CheckDestructors() manually at some interval, the
> natural thing to do is chain it to Lua's garbage collection cycle. The
> Lua virtual machine supports this by calling the gc tag method for the
> nil type at the end of a cycle."
> 
> I realise that this document was written for a much older version of
> Lua and a lot of it is probably out of date, but is there still any
> equivalent way to have Lua run a particular function after each
> garbage collection in the current version?

You can try something like this:

mt = {__gc = function ()
               <do whatever you want here>
               create_new_userdata_with_metatable(mt)
             end
     }

create_new_userdata_with_metatable(mt)

-- Roberto