Mostly using collection classes such as std::string, std::vector, std::map and so on, but also using smart pointers such as std::unique_ptr for lower-level st

Mostly using collection classes such as std::string, std::vector, std::map and so on, but also using smart pointers such as std::unique_ptr for lower-level stuff. And of course, the Standard Library is built on those "core features" - it just makes them easier and safer to use.