[Boost-users] [multiindex] hashed index, modify() and traversal

Hello, I'm modifying the elements of a multiindex container by accessing them through an hashed index (I suppose that this is faster than accessing them through the other index, which is ordered). I would like to know if I can keep going ++ on the hashed iterator as the elements of the container get changed, without modifying the same elements more than once or reaching the end() prematurely. In other words, does the re-hash change the relative positions of the elements or are they unaltered as the elements are modified? Thanks very much, Francesco