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  1. #include <iostream>
  2. class A;
  3.  
  4. class B
  5. {
  6. private:
  7. public:
  8.     void bfun (A* Aref);
  9. };
  10.  
  11. class A{
  12. private:
  13.     int x;
  14.     B b_obj;
  15. public:
  16.     void afun();
  17.     friend void B::bfun(A*);
  18. };
  19.  
  20. void B::bfun(A* Aref)
  21. {
  22.     Aref->x = 1;
  23.     std::cout<< Aref->x << '\n' ;
  24. }
  25.  
  26. void A::afun()
  27. {
  28.     x=0;
  29.     b_obj.bfun(this);
  30. }
  31.  
  32. int main()
  33. {
  34.     A aobj;
  35.     aobj.afun();
  36.     return 0;
  37. }
  38.  
Success #stdin #stdout 0s 4380KB
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stdin 
Standard input is empty
stdout 
1
https://ideone.com/zNWBye
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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