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basic on stephen dewhurst work.
https://www.stevedewhurst.com/once_weakly.html
15 February 2017: Template Trees for Modern C++ Interfaces
https://www.stevedewhurst.com/once_weakly/once-weakly20170215/once-weakly20170215.pdf
CppCon 2017: Stephen Dewhurst “Modern C++ Interfaces..."
https://www.youtube.com/watch?v=PFdWqa68LmA