fork download
copy 
  1. #include <iostream>
  2. #include <memory>
  3. using namespace std;
  4.  
  5. class T;
  6.  
  7. std::weak_ptr<T> wptr;
  8.  
  9. class T
  10. {
  11. public:
  12. 	T() {  }
  13. 	~T() {
  14. 		std::cout << "in dtor" << std::endl;
  15. 		std::cout << (wptr.expired() ? "expired" : "not expired") << std::endl;
  16. 	}
  17. };
  18.  
  19. int main() {
  20. 	{
  21. 		auto ptr = std::make_shared<T>();
  22. 		wptr = ptr;
  23. 		std::cout << (wptr.expired() ? "expired" : "not expired") << std::endl;
  24. 	}
  25. 	return 0;
  26. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
not expired
in dtor
expired
https://ideone.com/ZSKXC2
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!