File: main.cpp

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#include <cassert>
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);
}