Hi, There is a thread on comp.lang.c++.moderated where the problem of manipulating with "heavy" data in STL containers was raised. The name of the thread is "Messign with expensive objects in containers". I have posted a solution with the help of a simple view adaptor class that I wrote a while ago. The code with examples and documentation is here: http://www.msobczak.com/prog/bin/view.zip (11kB) Alberto Barbati suggested to post it here for review. It is different from boost::multi_index in that view operates on already existing objects or sequences. Note: the view class itself is very simple and as a concept is only a fraction of what is available in the View Template Library: http://www.zib.de/weiser/vtl/ I would like to know your opinion about the view as a concept, and its simple implementation that I referenced above. It might fit into the Containers category of Boost libraries. Regards, -- Maciej Sobczak http://www.msobczak.com