File: main.cpp

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class  A
{
  public:
  int&  i;
  A(int &i):i(i) {}
  private:
  A& operator=(const A&);
};

int main()
{
  int var;
  int& ref =var;
  var = 10;
  A a(var);
  a.i = 20;
  assert(var==20);
}