File: main.cpp

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class I
{
  int i;
  public:
  int get() {return i;}
  void set(int i) {this->i=i;}
  I& operator<<=(const I& ref) {i <<= ref.i; return *this;}
  I& operator>>=(const I& ref) {i >>= ref.i; return *this;}
  I& operator+=(const I& ref) {i += ref.i; return *this;}
  I& operator-=(const I& ref){i -= ref.i; return *this;}
};

int main()
{
  I i1, i2;
  i1.set(1);
  i2.set(2);
  i2+=i1;
  assert(i2.get()==3);
  i2-=i1;
  assert(i2.get()==2);
  i2 <<= i1;
  assert(i2.get()==4);
  i2 >>= i1;
  assert(i2.get()==2);
  i2 = i1;
  assert(i2.get()== 1);
}