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();
}