As I know C++ now allows multiple dispatch for std::variant: https://en.cppreference.com/w/cpp/utility/variant/visit2.htm....

And std::variant is now a better choice for cases like in the article above, where previously inheritance was used to represent a closed set of possible subtypes.

Where "now" means C++17 or C++20 depending on whether or not you understand what INVOKE<R> semantics are?

TIL that std::visit supports multiple variants. How new is that ?