Actually it seems MSVC doesn't like "not", "or" and "and" : replacing them with "!", "||" and "&&" makes the error (and the warning) go away.
It may be related to this page: http://www.boost.org/development/int_const_guidelines.html I will try to comply with all these recommendations which will be difficult! Hope it will solve this type of issues.
Can you try the following version and tell me if it compiles fine? http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_traits-dos.tar.bz2&directory=Extension& I have removed any call to logical operators in constant expressions and replaced them by ice constructs (not done yet for all operators but should be ok for <<). I still have to remove reference to numeric_limits which seems to be an issue with some compilers. Frédéric