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Question #18 Difficulty: 1

According to the C++17 standard, what is the output of this program? 

    #include <iostream>

class A {
public:
  virtual void f() { std::cout << "A"; }
};

class B : public A {
private:
  void f() { std::cout << "B"; }
};

void g(A &a) { a.f(); }

int main() {
  B b;
  g(b);
}

Hint:

What is the type of the expression a?
What is the dynamic type of a?
Which of these is used for access checking, and which is used to select which f() to call?

Answer:

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