I have tried to comply with the coding guidelines for integral constant expressions (http://www.boost.org/development/int_const_guidelines.html).
I personally ignore this page. It was originally written for VC 6 and Borland 5.5 which are both pretty much irrelevant at this point. Unless someone can confirm that these problems still exist in recent versions of Codegear, I vote that we remove this page.
I now comply with all the rules. It seems that VC++ has still some issues with having logical operators in default values of bool template parameters. VC++ yields compile time error with: template < T, bool B= expr1 and expr2 > struct foo; When replacing 'and' by '&&' the error disappears. When replacing 'expr1 and exp2' by 'ice_and<expr1, expr2>::value' it also works and removes some warnings in g++. So it seems that this coding requirements are still useful. New version of the type_traits extension available here: - vault unix: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_traits.tar.bz2&directory=Extension& - vault dos: http://www.boostpro.com/vault/index.php?action=downloadfile&filename=type_traits-dos.tar.bz2&directory=Extension& - sandbox: http://svn.boost.org/svn/boost/sandbox/type_traits/ Frédéric