Jon Kalb's talk at the New York C++ Developer meetup based on Anthony Williams' article in Overload is now online:

Using enum structs as bitfields (slides)

by Jon Kalb

From the description:

Jon Kalb gave a talk on Enum Bitfields at the New York C++ Developers group 2016-07-12. The talk was based on an article by Anthony Williams that is a gentle introduction to SFINAE. It includes a few nice library development pointers.