Contravariance or whatever

#include <iostream>

class A
{
  public:
    int bob;
    A()
    {
      bob = 4;
    }
};

class B : public A
{
  public:
    int magic;
    B()
    {
      bob = 5;
      magic = 42;
    }
};

void evilFunc(A as[])
{
  A a;
  as[0] = a;
  as[1] = a;
}

int main(void)
{
  B bs[2];
  evilFunc(bs);
  std::cout << bs[0].magic << " " << bs[0].bob << std::endl;
  std::cout << bs[1].magic << " " << bs[1].bob << std::endl;
}