No, you only need to implement the addref/release functions for the base class. See libs/smart_ptr/test/intrusive_ptr_test.cpp for an example.
A future boost release will probably contain such a base class. I didn't want to introduce one at this time since it may have created confusion, as 1.29 had boost::counted_base that was automatically recognized by shared_ptr. In 1.30 shared_ptr no longer supports intrusive counting.
Hmm, sounds like that is essentially what my shared_ptr_count turned out to be. How about just renaming shared_ptr_count to intrusive_ptr_count_base or something like that and including it in the intrusive_ptr.hpp file. That way people can roll their own if they like or just use the included mechanism if that is more convenient. Seems better than leaving it as an exercise for the user.
Also, I added a 'release' method to my version of intrusive_ptr. I needed this to get out of a circular reference situation.
Scott Maxwell
PocketPurchase, Inc.
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