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  1. class Base  {
  2. private:
  3.     friend class Locker;
  4.     virtual ~Base() = 0;
  5. };
  6.  
  7. Base::~Base() {}
  8.  
  9. class Locker: protected virtual Base
  10. {
  11. };
  12.  
  13. class DerLocker : public Locker
  14. {
  15.     //DerLocker() : Locker() {}
  16. } ;
  17.  
  18.  
  19. int main()
  20. {
  21.    Locker l;
  22.    //DerLocker d;
  23. }
  24.  
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https://ideone.com/hbq90L
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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