Downcasting shared_ptr to shared_ptr?

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You can use dynamic_pointer_cast. It is supported by std::shared_ptr.

std::shared_ptr<Base> base (new Derived());
std::shared_ptr<Derived> derived =
               std::dynamic_pointer_cast<Derived> (base);

Documentation: https://en.cppreference.com/w/cpp/memory/shared_ptr/pointer_cast

Also, I don’t recommend using cast operator in the base class. Implicit casting like this may become the source of bugs and errors.

-Update: If the type is not polymorphic, std::static_pointer_cast may be used.

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