File: main.cpp

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struct A
{
  int i;
};

struct B:  A
{
};

int get_i1(A& a)
{
  return static_cast<B*>(&a)->i;
}

int get_i2(A* pa)
{
  return static_cast<B*>(pa)->i;
}

int main()
{
  B b;
  b.i = 10;
  int tmp1 = get_i1(b);
        assert(tmp1 == 10);

  int tmp2 = get_i2(&b);
        assert(tmp2 == 10);
}