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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. using namespace std;
  5.  
  6. struct Test
  7. {
  8. };
  9.  
  10. int main() {
  11. 	auto ptr = make_shared<Test>();
  12. 	auto ptr2 = ptr;
  13.     weak_ptr<Test> wp = ptr;
  14.  
  15. 	std::cout << "Use count #1: " << ptr2.use_count() << std::endl;
  16. 	std::cout << "Use count #1_wp: " << wp.use_count() << std::endl;
  17. 	ptr.reset();
  18. 	std::cout << "Use count #2: " << ptr2.use_count() << std::endl;
  19. 	std::cout << "Use count #2_wp: " << wp.use_count() << std::endl;
  20. 	std::cout << "Use count #2_lock: " << wp.lock().use_count() << std::endl;
  21. 	ptr2.reset();
  22. 	std::cout << "Use count #3_wp: " << wp.use_count() << std::endl;
  23.  
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Use count #1: 2
Use count #1_wp: 2
Use count #2: 1
Use count #2_wp: 1
Use count #2_lock: 2
Use count #3_wp: 0
https://ideone.com/LzYlYZ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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