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C++ you either use templates or classes and virtuals. In either case the caller doesn't get to decide.

• Seattle3503 9mo ago
  Interesting, there isn't some way to have a template that is polymorphic over virtuals?
  • Maxatar 9mo ago
    In C++ you do it the other way around, have a single class that is polymorphic over templates. The name of this technique within C++ is type-erasure (that term means something else outside of C++). Examples of type erasure in C++ are classes like std::function and std::any, and normally you need to implement the type erasure manually, but there are some library that can automate it to a degree, such as [1], but it's fairly clumsy. [1] https://www.boost.org/doc/libs/latest/doc/html/boost_typeerasure.html https://www.boost.org/doc/libs/latest/doc/html/boost_typeera...
    • bfrog 9mo ago
      It's neat this is a thing I guess, but I agree it looks fairly clumsy compared to the Rust answer.