[lenkite]

You have std::variant and std::visit. https://www.bfilipek.com/2018/09/visit-variants.html Or you can use a library: https://github.com/mpark/patterns

[lmm]

> You have std::variant and std::visit. https://www.bfilipek.com/2018/09/visit-variants.html

Which isn't a true sum type because it doesn't nest properly.

> Or you can use a library: https://github.com/mpark/patterns

Interesting; proper pattern-matching is nice, but the lack of type safety is still a major issue.