Re: Another collectgarbage question. (Inherited class)

Taesoo Kwon wrote:
> Hello,
>
> I am using luabind 0.8.1, lua5.1.4, MSVC2005.
> I have an example where garbage collection doesn't work for a derived 
> lua class.
> Is this a normal behavior? What should I modify?
>
> class 'VVV'
>
> function VVV:__init()
>    print("ctor VVV")
> end
>
> function VVV:__finalize()
>    print("dtor VVV")
> end
>
>
> class 'GCtest'
>
> function GCtest:__init()
>    self.skel=VVV()
> end
>  
> class 'GCtest2'(GCtest) -- derived class
> function GCtest2:__init()
>    GCtest.__init(self)
> end
>
> function gctest()
>    do
>       local test=GCtest()  
>    end
>    collectgarbage() -- dtor of VVV is called.
>    collectgarbage()
>    collectgarbage()
>
>    do
>       local test=GCtest2()
>    end
>    collectgarbage()
>    collectgarbage()
>    collectgarbage() -- dtor of VVV is not called.
>
> end
>
> Thank you.
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>
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>   
It is Lua that decides when the finalize method of a table will be 
called. It will do it eventually, but it does not guarantee that it will 
be called at any particular time. And if Lua's garbage collection 
functions don't want to do a full CG on everything in memory when you 
call the function, then there's nothing you can do.

This is the price you pay for having a fast garbage collector.

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