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  1. #include <iostream>
  2. #include <memory>
  3. #include <string>
  4.  
  5. class Foo : public std::enable_shared_from_this<Foo> {
  6. public:
  7. 	Foo(const std::string& i_name) : name(i_name) {}
  8.  
  9. 	std::function<void()> GetPrinter() {
  10. 		std::weak_ptr<Foo> weak_this = shared_from_this();
  11.  
  12. 		return [weak_this]() {
  13. 			auto that = weak_this.lock();
  14. 			if (!that) {
  15. 				std::cout << "The object is already dead" << std::endl;
  16. 				return;
  17. 			}
  18.  
  19. 			std::cout << that->name << std::endl;
  20. 		};
  21. 	}
  22.  
  23. 	std::string name;
  24. };
  25.  
  26. int main() {
  27. 	std::function<void()> f;
  28.  
  29. 	{
  30. 		auto foo = std::make_shared<Foo>("OK");
  31. 		f = foo->GetPrinter();
  32. 	}
  33.  
  34. 	auto foo = std::make_shared<Foo>("WRONG");
  35.  
  36. 	f();
  37.  
  38. 	return 0;
  39. }
  40.  
Success #stdin #stdout 0s 3480KB
comments (?)
stdin 
Standard input is empty
stdout 
The object is already dead
https://ideone.com/Wi6O11
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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