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  1. #include <utility>
  2. #include <iostream>
  3.  
  4.  
  5. struct H {
  6. 	template<std::size_t ... Idxs, class ... Ts>
  7. 	static decltype(auto) get_desired (
  8. 		std::index_sequence<Idxs ...>,
  9. 		Ts && ... ts
  10. 	) {
  11. 		struct Ignore { Ignore (...) {} };
  12.  
  13. 		return
  14. 			([] (decltype(Idxs, Ignore{}) ..., auto && t, auto ...)
  15. 			-> decltype(auto) {
  16. 				return std::forward<decltype(t)> (t); 
  17. 			}) (std::forward<Ts> (ts) ...);
  18. 	}
  19. };
  20.  
  21. template<std::size_t N, class ... Ts>
  22. decltype(auto) get_nth_param (Ts && ... ts) {
  23. 	return H::get_desired (
  24. 		std::make_index_sequence<N> {},
  25. 		std::forward<Ts> (ts) ...
  26. 	);
  27. }
  28.  
  29. int main() {
  30. 	// your code goes here
  31. 	std::cout << get_nth_param<3> (10, 20, 30, "Testme") << std::endl;
  32. 	return 0;
  33. }
Success #stdin #stdout 0s 4576KB
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stdin
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Standard input is empty
stdout
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Testme
https://ideone.com/Xm4LrI
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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