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  1. #include <iostream>
  2. #include <optional>
  3.  
  4. void fn(const std::optional<std::string> s)
  5. {
  6. 	if (s)
  7. 		std::cout << *s << '\n';
  8. 	else
  9. 		std::cout << "Empty" << '\n';
  10. }
  11.  
  12. int main()
  13. {
  14. 	fn("Hello");
  15. 	fn("Goodbye");
  16. 	fn(std::optional<std::string>());
  17. }
  18.  
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https://ideone.com/yquNLG
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Text (text 6.10)
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