File: main.cpp

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struct A
{
  int i;
  A() : i(1)
  {
  }

  int &operator*()
  {
    return i;
  }
  int operator+(int j)
  {
    return i + j;
  }
  int operator~()
  {
    return ~i;
  }
  int operator[](int k)
  {
    return i;
  }
  int operator==(int k)
  {
    return i = i;
  }

  void func1()
  {
    A a;
    assert(*a == 1);
    assert(*a + 1 == 2);
    assert(~a == ~1);
    assert(a[2] == *a);
    assert(a == 1);
  }

  void func2()
  {
    A a;
    assert((*this) == 1);
    assert((*this) + 1 == 2);
    assert(~(*this) == ~1);
    assert((*this)[2] == *(*this));
    assert((*this) == 1);
  }
};

int main()
{
  A o;
  assert(*o == 1);
  assert(*o + 1 == 2);
  assert(~o == ~1);
  assert(o[2] == *o);
  assert(o == 1);

  o.func1();
  o.func2();
}