It turns out that class member function definitions that take in named parameters will not compile with BOOST_NAMED_PARAMS_FUN. The first two lines of this macro, meant to generate the function prototype so that free function overloads can call it, cause a "duplicate definition" error when the macro is used in a class body. Fortunately, removing those two lines to create the BOOST_NAMED_PARAMS_MEMBER_FUN macro was all that was needed to eliminate the error. Sooo...here's yet another patch, along with a two-file program illustrating both macros in action. Cromwell D. Enage P.S. I better start adding my middle initial, to match with the name I use in my licensing info. __________________________________ Do you Yahoo!? Yahoo! Mail - Helps protect you from nasty viruses. http://promotions.yahoo.com/new_mail