must have done something very silly, but code that used compiled fine now gives me: g++ -gfull -Wall -Werror -fexceptions -DDEBUG_TP -Ddarwin86 -I./ -Itp_datastruct/ -Iutil/ -I/usr/local/include -I/Users/frank/Sandbox/work -c -o objs/Profile.o tp_datastruct/Profile.cpp In file included from /usr/local/include/boost/type_traits/is_class.hpp:16, from /usr/local/include/boost/type_traits/is_abstract.hpp:55, from /usr/local/include/boost/type_traits/is_convertible.hpp:25, from /usr/local/include/boost/type_traits/is_enum.hpp:19, from /usr/local/include/boost/type_traits/is_signed.hpp:15, from /usr/local/include/boost/type_traits/make_unsigned.hpp:14, from /usr/local/include/boost/lexical_cast.hpp:33, from tp_datastruct/AttributeValue.h:13, from tp_datastruct/Profile.h:10, from tp_datastruct/Profile.cpp:3: /usr/local/include/boost/type_traits/is_union.hpp:38: error: expected primary-expression before ')' token /usr/local/include/boost/type_traits/is_union.hpp:38: error: a function call cannot appear in a constant-expression Any idea?? fastier@yahoo.com Frank fastier@yahoo.com