id summary reporter owner description type status milestone component version severity resolution keywords cc 3035 non-standard integral types not fully supported Maxim.Yanchenko@… John Maddock It looks only integral_promotion.hpp and is_integral.hpp are aware of non-standard integral types like !__int64, while make_unsigned, is_unsigned, make_signed, and is_signed are not. Bugs closed Boost 1.40.0 type_traits Boost 1.39.0 Problem invalid