C++20 - or not
summary
C++20 ships a huge set of features and many small fixes; notable arrivals include std::source_location and finally better enum typedefs for naming enum members, while promised items like stacktrace and several low‑level object‑creation proposals miss the cut and are postponed. Committee paper submissions grow faster than attendance, which contributes to delays and staggered rollouts; check compiler support pages for which compilers actually implement each feature.
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