File: main.cpp

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#include <cassert>
struct A
{
  int a;
  A operator++(int zero)
  {
    A obj(*this);
    a++;
    return obj;
  }

  A &operator++()
  {
    a++;
    return *this;
  }

  A operator--(int zero)
  {
    A obj(*this);
    a--;
    return obj;
  }

  A &operator--()
  {
    a--;
    return *this;
  }
};

int main()
{
  A obj;
  obj.a = 0;
  A obj2 = obj++;
  assert(obj2.a == 0 && obj.a == 1);
  obj2 = ++obj;
  assert(obj2.a == 2 && obj.a == 2);
  obj2 = obj--;
  assert(obj2.a == 2 && obj.a == 1);
  obj2 = --obj;
  assert(obj2.a == 0 && obj.a == 0);
}