(Sorry, Outlook webmail forces crappy indendation) ________________________________ From: boost-bounces@lists.boost.org on behalf of Niels Dekker - mail address until 2008-12-31 Sent: Tue 25/03/2008 20:44 To: boost@lists.boost.org Subject: Re: [boost] 1704 [any] 4512 warning from VC8/9 on warning level 4 FWIW, yes, I also build my applications at MSVC warning level 4. But in this particular case, I don't think that this specific warning needs to be pragma'd off! The warning reported by ticket #1704 says: "boost/any.hpp(130) : warning C4512: 'boost::any::holder<ValueType>' : assignment operator could not be generated" <http://svn.boost.org/trac/boost/ticket/1704> MJB>> This is one of the warning that I tend to pragma off globally. Wouldn't it be preferable to explicitly disallow the assignment of any::holder? MJB>> I bet it already is Just by adding a private and unimplemented copy assignment operator? When doing so, we'll get rid of the warning automatically. MJB>> But that's not the way to explicitly disallow assignment. Instead you derive from boost::non_copyable (sp?). And that causes the warning -- Martin Bonner