David Abrahams writes:
"Andy Little" <andy@servocomm.freeserve.co.uk> writes:
The std version doesnt specify the tag, nor does the boost type_traits version in its documentation. Without the tag, boost::integral_constant would not work with mpl types such as equal_to as demonstrated in another mail in this thread. Therefore changing from boost::integral_constant to std::integral_constant will break code that uses mpl. Maybe its not important, but the innocent std:: integral_constant will appear to be bug ridden.
I see no requirement that a `tag' type member be included in http://boost.org/libs/mpl/doc/refmanual/integral-constant.html. However, it does look like the current implementation of equal_to depends on the presence of `tag'. I'm not sure what the plan was here; Aleksey?
Please see http://article.gmane.org/gmane.comp.lib.boost.devel/146324. -- Aleksey Gurtovoy MetaCommunications Engineering