Hi: I have the following defines: typedef boost::bimaps::bimap>, int> SignsList_type; SignsList_type SignsList; I need to compare each std::bitset in the left-hand side of the map i.e in the vector with an std::vector I am fillingin a boost::foreach loop. What is the best way of doing this? Any help apreciated. Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3417 (20080905) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com