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  1. #include <iostream>
  2. #include <typeinfo>
  3.  
  4. //template<typename T>
  5. //void tester(T&)
  6. //{
  7. //	std::cout << "tester(" << typeid(T).name() << "&):\n\tlvalue reference - " << std::boolalpha <<
  8. //		std::is_lvalue_reference<T>::value << "\n\trvalue reference - " << std::is_rvalue_reference<T>::value << '\n';
  9. //}
  10.  
  11. template<typename T>
  12. void tester(T&&)
  13. {
  14. 	std::cout << "tester(" << typeid(T).name() << "&&):\n\tlvalue reference - "  << std::boolalpha << std::is_lvalue_reference<T>::value
  15. 		<< "\n\trvalue reference - " << std::is_rvalue_reference<T>::value << '\n';
  16. }
  17.  
  18. int main()
  19. {
  20. 	std::cout << "How on Earth that is_rvalue_reference and is_lvalue_reference work?!\n";
  21. 	int intval{ 123 };	int& intref{ intval };	int const&& intrref{ 123 };
  22.  
  23. 	tester(intval);		// lvalue reference	
  24. 	tester(intref);		// lvalue reference		
  25. 	tester(intrref);		// lvalue reference									// not a single true, thats wrong somehow
  26. 	tester(std::move(intval));	// false
  27. 	tester(std::move(intref));	// false
  28. 	tester(std::move(intrref));	// false
  29.  
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 4372KB
comments (?)
stdin 
Standard input is empty
stdout 
How on Earth that is_rvalue_reference and is_lvalue_reference work?!
tester(i&&):
	lvalue reference - true
	rvalue reference - false
tester(i&&):
	lvalue reference - true
	rvalue reference - false
tester(i&&):
	lvalue reference - true
	rvalue reference - false
tester(i&&):
	lvalue reference - false
	rvalue reference - false
tester(i&&):
	lvalue reference - false
	rvalue reference - false
tester(i&&):
	lvalue reference - false
	rvalue reference - false
https://ideone.com/iTkkjK
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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