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  1. #include <iostream>
  2.  
  3. struct X
  4. {
  5. 	int a;
  6. 	friend bool operator<(const X& left, const X& right) { return left.a < right.a; }
  7. private:
  8. 	struct safe_zero_idiom;
  9. public:
  10. 	friend bool operator<(const X& left, safe_zero_idiom*) { return left.a < 0; }
  11. };
  12.  
  13. int main()
  14. {
  15. 	X x{1}, y{-2};
  16. 	//if (x < 3)
  17. 	std::cout << (y < x) << "\n";
  18. 	std::cout << (y < 0) << "\n";
  19. }
Success #stdin #stdout 0s 3340KB
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https://ideone.com/vUxmxi
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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