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
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
We could probably phase out TreeShared if we were really careful to avoid
refcount thrash during tree construction/manipulation. I believe this can be
done with careful use of PassRefPtr and swap() and it would likely be easier to
understand if Nodes normally had a refcount of 1 instead of 0.
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