zzz.cpp

// clang main.cpp -lstdc++ -std=c++14 -o main
#include <iostream>
#include <string>

class A {
public:
  std::string name() {
    return "A";
  }
};

class B: public A {
public:
  std::string name() {
    return "B";
  }
};

int main(int argc, const char *argv[]) {
  A a;
  B b;
  std::cout << "A: " << a.name() << std::endl;
  std::cout << "B: " << b.name() << std::endl;
  std::cout << "B (as A): " << static_cast<A>(b).name() << std::endl;
  return 0;
}