Hi, to use boost::noncopyable I have to include boost/utility.hpp, i.e. _all_ utilities consisting of several template classes and functions. I expected to have a separate header in favour of compilation speed (as for boost/utility/base_from_member.hpp or boost/checked_delete.hpp which are included from utility.hpp). OK, at the end the preprocessed output is only ~100 lines (empty lines stripped) instead of 10 but what speaks against a separate header? Regards, Volker -- Volker Boerchers System Engineer TECON Systems AG, Perlengraben 2, 50676 Köln, http://www.tecon.de Tel: +49-221-92007-55, Fax: +49-221-92007-77