3 ms·

Afaik it is just some (quite a few) type traits, like std::is_class and such that you could not write yourself without compiler intrinsics.

• zabzonk 4y ago
  dunno - far beyond my pay level. but: https://en.cppreference.com/w/cpp/types/is_class https://en.cppreference.com/w/cpp/types/is_class
  • gpderetta 4y ago
    Sure, but now you have to implement is_union (I guess 'not is_class' is not going to work :) )