Subject: Re: [mpl] Integral Constant is over specified
Newsgroups: gmane.comp.lib.boost.devel
Date: 2006-07-31 23:45:32 GMT (2 years, 48 weeks, 1 day, 19 hours and 37 minutes ago)
Andy Little writes: > The boost type_traits integral constant is derived from > mpl::integral_c which has a tag type member, without which > boost:::integral_constant wouldnt work with mpl types such as > equal_to. 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. Ideally, I'd like to link the '::tag' requirement with the mixed-type arithmetic operations (for which the tag was introduced) and move it out of the Integral Constant requirements into a corresponding concept. Either way, making the above work is not a major issue. -- Aleksey Gurtovoy MetaCommunications Engineering _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost