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  1. #include <iostream>
  2. #include <boost/optional.hpp>
  3.  
  4. struct X
  5. {
  6. 	int x;
  7. 	boost::optional<X&> parent;
  8. };
  9.  
  10. int main()
  11. {
  12. 	X a, b;
  13. 	a.x = 1; b.x = 2;
  14. 	b.parent = a;
  15. 	std::cout << b.parent->x << "\n";
  16.  
  17. 	a.x = 42;
  18. 	std::cout << b.parent->x << "\n";
  19. }
  20.  
Success #stdin #stdout 0.01s 2724KB
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Standard input is empty
stdout
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1
42
https://ideone.com/IBziN
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
secret

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