Heck I'm still using gsl::span, though that's mainly for compatibility with a C++17 compiler. It's great that std::span was standardized, maybe it was overdue,

Heck I'm still using gsl::span, though that's mainly for compatibility with a C++17 compiler. It's great that std::span was standardized, maybe it was overdue, but it's just a drop-in replacement for stuff that already existed and worked fine.