[Boost-users] multi_index_comtainer questions

Hi, All, I just have started using boost and have some questions, answers on that i couldn’t find in the documentation. My interest is in using multi_index_container as combination of advantages of standard bidirectional list as well as fast lookup (insertion) of standard associative container (particularly set). Let’s say we have the following definitions: typedef boost::multi_index_container< UserInfo, boost::multi_index::indexed_by< boost::multi_index::sequenced<>, boost::multi_index::ordered_unique< boost::multi_index::identity<UserInfo>, UserInfoLess> > > UsersContainer; typedef UsersContainer::nth_index<0>::type UsersList; typedef UsersContainer::nth_index<1>::type UsersSet; Now we want to insert some value into this container the following way: UsersSet& setIndex = m_Users.get<1>(); std::pair insRet = setIndex.insert(someVal); The question is how can i acquire iterator of m_Users having the iterator UsersSet::iterator ? Do iterators keep the property of set’s iterators that they remain valid after insertion of an element? Thanks for the answers, Vladimir Voronkov.