[boost] [interprocess] atomic<offset_ptr>

hi ion, i was wondering, what would be the best way to provide an atomic<offset_ptr>? it cannot be used out of the box, as offset_ptr does not conform to the std/boost::atomic<> requirements. afaict, one would have to pre-compute the offset for a specific memory location when performing a compare_exchange or store and fix up the offset after an atomic load. to do that, it will probably be required to access some internals of the offset_ptr. also, if i'm going to work on it (not sure if i will have time), where shall the implementation go? in a way, i'd rather put it into interprocess than into atomic. thoughts? cheers, tim