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  1. #include <iostream>
  2.  
  3. template<typename Tag, typename Tag::type M>
  4. struct Rob { 
  5.   friend typename Tag::type get(Tag) {
  6.     return M;
  7.   }
  8. };
  9.  
  10.  
  11. using namespace std;
  12. class Point
  13. {
  14. public:
  15.     Point( void ) : m_i(0) {}
  16.     void PrintPrivate( void ){cout << m_i << endl; }
  17. private:
  18.     int m_i;
  19. };
  20.  
  21. struct Point_f { 
  22.   typedef int Point::*type;
  23.   friend type get(Point_f);
  24. };
  25. template struct Rob<Point_f, &Point::m_i>;
  26.  
  27. void ChangePrivate ( Point &i ) 
  28. {  
  29.     i.*get(Point_f()) = 4;
  30. }
  31.  
  32. int main()
  33. {
  34.      Point sPoint;
  35.      sPoint.PrintPrivate();
  36.      ChangePrivate(sPoint);
  37.      sPoint.PrintPrivate();
  38. }
Success #stdin #stdout 0.02s 2680KB
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https://ideone.com/rpyuvp
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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