Tuesday, February 9, 2010, 6:42:08 PM, you wrote: > Try Boost.Bimap? > http://www.boost.org/doc/libs/1_42_0/libs/bimap/doc/html/index.html > Hope this helps! > Ben Boost.MultiIndex is also worth looking at in this regard. http://www.boost.org/doc/libs/1_41_0/libs/multi_index/doc/index.html