Dynamic languages do it at runtime too, JUST LIKE rust and C++ do. What's the difference?
C++ and Rust let you have compile-time safety, until you choose to give it up and have runtime checks instead. Dynamic languages only allow the latter. Static languages let you choose, dynamic languages chose the latter for you in all cases. Both can have dynamic dispatch.
Besides, static languages can have compile-time type safe dynamic dispatch, if you constrain the dispatch to compile-time-known types (eg std::variant). You only lose that if you want fully unconstrained dynamism, in which case you defer type checking to runtime. Which is what dynamic languages always have.
So both C++ and Rust DO have dynamic dispatch and the programmer gets to choose what level of the dynamism/safety trade off they want. And yes, these features ARE first class features of the languages.
C++ and Rust let you have compile-time safety, until you choose to give it up and have runtime checks instead. Dynamic languages only allow the latter. Static languages let you choose, dynamic languages chose the latter for you in all cases. Both can have dynamic dispatch.
Besides, static languages can have compile-time type safe dynamic dispatch, if you constrain the dispatch to compile-time-known types (eg std::variant). You only lose that if you want fully unconstrained dynamism, in which case you defer type checking to runtime. Which is what dynamic languages always have.
So both C++ and Rust DO have dynamic dispatch and the programmer gets to choose what level of the dynamism/safety trade off they want. And yes, these features ARE first class features of the languages.