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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. int main() {
  5. 	std::weak_ptr<int> q;
  6.  
  7. 	{
  8. 		std::shared_ptr<int> p = std::make_shared<int>(666);
  9. 		std::cout << p.get() << " = " << *p << " (" << p.use_count() << ", expect 1)\n";
  10. 		q = p;
  11. 		std::cout << p.get() << " = " << *p << " (" << p.use_count() << ", expect 1)\n";
  12. 		{
  13. 			std::shared_ptr<int> r = p;
  14. 			std::cout << p.get() << " = " << *p << " (" << p.use_count() << ", expect 2)\n";
  15. 		}
  16. 		std::cout << p.get() << " = " << *p << " (" << p.use_count() << ", expect 1)\n";
  17. 	}
  18. 	std::cout << "q is " << (q.expired() ? "expired, which is expected" : "NOT expired, which is unexpected\n");
  19.  
  20. 	return 0;
  21. }
Success #stdin #stdout 0.01s 5548KB
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stdin
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Standard input is empty
stdout
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0x56350fd09e80 = 666 (1, expect 1)
0x56350fd09e80 = 666 (1, expect 1)
0x56350fd09e80 = 666 (2, expect 2)
0x56350fd09e80 = 666 (1, expect 1)
q is expired, which is expected
https://ideone.com/7qfCwq
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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