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  1. #include <iostream>
  2. #include <list>
  3. using namespace std;
  4.  
  5. class A;
  6. class B;
  7. class C;
  8. class D;
  9.  
  10. class A
  11. {
  12.  
  13. };
  14.  
  15. class B : public A
  16. {
  17.    friend class C;
  18.    friend class D;
  19. private:
  20.    class BB
  21.    {
  22.       list<C> c;
  23.       list<D> d;
  24.    };
  25. };
  26.  
  27. class C : public B::BB
  28. {
  29.  
  30. };
  31.  
  32. class D : public B::BB
  33. {
  34.  
  35. };
  36.  
  37. int main() {
  38. 	// your code goes here
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 4368KB
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https://ideone.com/G4OOj7
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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