File: main.cpp

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// #include <assert.h>
// #include <iostream>
struct A
{
  virtual int f()
  {
    return 1;
  }
  virtual int g()
  {
    return 1;
  }
};

struct B : A
{
  int f()
  {
    return 2;
  }
};

struct C : B
{
};

struct D : C
{
  int g()
  {
    return 3;
  }
};

int main()
{
  D d;

  assert(d.f() == 2);
  assert(d.g() == 3);
  assert(((C *)(&d))->f() == 2);
  assert(((B *)(&d))->g() == 3);
  assert(((B *)(&d))->f() == 2);
  assert(((B *)(&d))->g() == 3);
  assert(((A *)(&d))->f() == 2);
  assert(((A *)(&d))->g() == 3);
}