On Sat, 2009-01-10 at 13:07 -0500, Yu Feng wrote:
> On Sat, 2009-01-10 at 18:35 +0100, Jürg Billeter wrote:
> > Right, but I'm not sure that you need to change anything in the unref
> > function to get dispose functionality working. Can you explain more
> > specifically what you can't get working with the current possibilities?
> >
>
> Yes I can do this:
>
> class Object {
> Object ref_to_there;
> Object ref_to_here;
> private disposed = false;
> public virtual void dispose() {
> /*release references here*/
> ref_to_there = null;
> ref_to_here = null;
> }
> private void run_dispose() {
> if(disposed) return;
> disposed = true;
> dispose();
> }
> public void destroy() {
> Object holder = this;
> /*needed if invoked from a weak reference of this*/
> run_dispose();
> holder = null;
> }
> }
>
> Then Object.destroy can be used to manifestly break any cycle
> references.
>
> I was thinking about auto-cycle-breaking but it is unfortunately beyond
> my knowledge.
Unfortunately, there is no magic trick to break reference cycles
automatically in a simple way. In general, this requires an additional
garbage or cycle collector which scans stack and heap.
Jürg
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