Non-member function cannot have access to private data of class - Functions

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• Nihal   -Posted on 08 Oct 15
  If a function is defined as a friend function then, it can access the private and protected data of that class.
  To declare a friend function, declare its prototype within the class, preceding it with the keyword friend.
  Example:
  class Add {
  int a, b;
  public:
  friend int sum(Add x);
  void setValue(int i, int j)
  {
  a = i;
  b = j;
  }
  };
  // Note: sum() function is not a member function of any class.
  int sum(Add x)
  {
  /* Because sum() is a friend function of myclass, it can
  directly access private data a and b. */
  return x.a + x.b;
  }
  int main()
  {
  Add addObj;
  addObj.setValue(10, 20);
  cout <<"Summation =:"<< sum(addObj);
  return 0;
  }
  

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