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  1. #include <iostream>
  2. #include <memory>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7. 	struct Parent;
  8. 	struct Child
  9. 	{
  10. 		shared_ptr<Parent> ptr;
  11.  
  12. 		Child(shared_ptr<Parent> a) :
  13. 			ptr(a)
  14. 		{}
  15. 	};
  16.  
  17. 	struct Parent : public enable_shared_from_this<Parent>
  18. 	{
  19. 		Child myChild;
  20.  
  21. 		Parent() : 
  22. 			myChild(shared_ptr<Parent>(this))
  23. 		{}
  24.  
  25.  
  26. 		shared_ptr<Parent> getptr()
  27. 		{
  28. 			return shared_from_this();
  29. 		}
  30. 	};
  31.  
  32.  
  33. 	shared_ptr<Parent> p(new Parent);
  34. 	cout << "UC of parent: " << p.use_count() << endl;
  35. 	cout << "UC of child ptr: " << p->myChild.ptr.use_count() << endl;
  36.  
  37. 	shared_ptr<Parent> p2(p);
  38. 	cout << "UC of parent: " << p2.use_count() << endl;
  39. 	cout << "UC of child ptr: " << p2->myChild.ptr.use_count() << endl;
  40.  
  41. 	return 0;
  42. }
Success #stdin #stdout 0s 3416KB
comments (?)
stdin 
Standard input is empty
stdout 
UC of parent: 1
UC of child ptr: 1
UC of parent: 2
UC of child ptr: 1
https://ideone.com/oejzAb
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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