[webkit-dev] Ref counting questions

Antti Koivisto koivisto at iki.fi
Wed May 22 10:41:30 PDT 2013

TreeShared is essentially an implementation detail of the DOM tree (the
only other client besides Node is SVGElementInstance).  It shouldn't be
used for anything else.

TreeShared keeps Nodes alive when they are part of a tree (have a parent
node) even when they have zero refcount. This way nodes don't need to
explicitly ref and deref their children.


On Wed, May 22, 2013 at 7:26 PM, Bem Jones-Bey <bjonesbe at adobe.com> wrote:

> Hey all,
> I've read the document at http://www.webkit.org/coding/RefPtr.html, but I
> still have some questions about using RefPtrs.
> The first one is listed in the "Improving this document" section of the
> aforementioned documentation:
>         • Perils of programming with TreeShared.
> What does that mean? What gotchas should I be aware of? (Heck, more
> details on any of the things in "improving this document" would be helpful,
> and I'll do my best to update the document with anything I learn if that's
> desired.)
> Also, I've noticed that there's both TreeShared and RefCounted, and they
> seem fairly similar to my uninitiated eye. What's the difference between
> the two and when should one use one or the other? Also, are there other
> templates/classes that I should be aware of?
> Thanks,
> Bem
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> webkit-dev mailing list
> webkit-dev at lists.webkit.org
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