id summary reporter owner description type status milestone component version severity resolution keywords cc 12703 BOOST_MPL_ASSERT_MSG cannot be used in constexpr functions socgerlia@… Aleksey Gurtovoy The current implementation of BOOST_MPL_ASSERT_MSG use a static const std::size_t varieble that cannot be used in constexpr functions. I think this can be replaced by an enum declare. why use static const varieble? Bugs new To Be Determined mpl Boost 1.62.0 Problem constexpr mpl socgerlia@…