#include <iostream>
#include <string>

class BaseClass {
 public:
  virtual std::string get_class_name() const {
    return "BaseClass";
  };

  virtual ~BaseClass() {
   std::cout << "Destructing base class\n";
 }
};

class SubClass: public BaseClass {
 public:
  std::string get_class_name() const override {
    return "SubClass";
  }

 ~SubClass() {
   std::cout << "Destructing subclass\n";
 }
};

void print_stuff(const BaseClass& base_class) {
  std::cout << base_class.get_class_name() << '\n';
}

int main() {
  auto subclass = static_cast<std::unique_ptr<BaseClass>>(
    std::make_unique<SubClass>());
  std::cout << subclass->get_class_name();
}