What's the highest C++ standard you can use with Boost.Graph today?

During our Boost Graph Modernization Workshop in Paris, one of the most frequent discussion points was the C++ standard version the Boost Graph Library should require. Modernization is intuitively in tension with C++14 😉

Some context worth knowing:

BGL currently supports C++14.
A lot of API modernization can be done without bumping the minimum.
Some modernization changes would land cleaner on a newer standard
We don't yet have a clear enough picture of our users' constraint space to inform our discussion about a potential baseline bump


We would deeply appreciate if you could find time to either answer this simple Github survey ( https://github.com/boostorg/graph/discussions/490 ), or to just drop a comment with your answer (C++14/17/20/23) in this reddit discussion !

Thank you for your time !



https://redd.it/1tc1v6x
@r_cpp