inline void Positioner::updateX(XYIterator iter,int x) { // note the get<1>() bit m_c.get<1>().modify( iter,(&ll::_1)->*&Positioner::entry::m_x=x); } Yes, this work fine, thanks!
PS: I posted an answer to some previous question of yours that you haven't confirmed yet: http://lists.boost.org/boost-users/2007/09/30804.php Is it all solved?
I've got two multi_index containers working fine now. I had a bit of trouble with the first one, which was involved in a fairly complex algorithm that was trouble-some to debug. My impressions from that experience is that: A. The iterator returned from erase was pointed somewhere that was obviously not right. I was erasing the 3rd element of a container holding 5 elements and the std::distance reported the correct results, but everything in the referenced element was zero. B. The iterators of the multi_index container become invalid after any modifications to the container. This was my biggest source of trouble... In general, I really like your container. The fact that it allows the swapping of key values was particularly useful.