optional and variant are new in C++17, actually. They were experimental in 14. But - in a sense, C++ still doesn't "have" them, since basically nothing in the

optional and variant are new in C++17, actually. They were experimental in 14. But - in a sense, C++ still doesn't "have" them, since basically nothing in the standard library relies on the availability of any of these. (And - I also try to avoid std::any)