My entry for the agenda at the CppCon meeting is...

"Member Layout Control"
<https://raw.githack.com/grafikrobot/papers/master/wg21/member_layout/member_layout_D1605R0.html>

It's "rough" first attempt at this. But it's good enough for discussion.

--
-- Rene Rivera
-- Grafik - Don't Assume Anything
-- Robot Dreams - http://robot-dreams.net