File: main.cpp

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class A
{
public:
  int ar[2];
  A &operator=(const A &ref)
  {
    ar[0] = ref.ar[1];
    ar[1] = ref.ar[0];
    return *this;
  }
};

int main()
{
  A a1;
  a1.ar[0] = 1;
  a1.ar[1] = 2;

  A a2;
  a2.ar[0] = 3;
  a2.ar[1] = 4;

  a2 = a1;
  assert(a2.ar[0] == a1.ar[1]);
  assert(a2.ar[1] == a1.ar[0]);
}