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  1. #include <iostream>
  2. #include <utility>
  3. #include <tuple>
  4.  
  5.  
  6. template <typename ... Args>
  7. void f(Args... args)
  8. {
  9. 	int dummy[] = {0, (std::cout << " " << std::forward<Args>(args), 0)...};
  10. }
  11.  
  12. namespace detail
  13. {
  14.  
  15. 	template<std::size_t I>
  16. 	struct impl
  17. 	{
  18. 		template <typename TUPLE>
  19. 		auto operator() (TUPLE&& t) { return std::get<I>(t); }
  20. 	};
  21.  
  22. 	template<>
  23. 	struct impl<2>
  24. 	{
  25. 		template <typename TUPLE>
  26. 		auto operator() (TUPLE&& t) { return std::get<2>(t) + 40; }
  27. 	};
  28.  
  29. 	template <std::size_t... Is, typename TUPLE>
  30. 	void bar(std::index_sequence<Is...>, TUPLE&& Tuple) {
  31. 		return f(impl<Is>{}(std::forward<TUPLE>(Tuple))...);
  32. 	}
  33.  
  34. }
  35.  
  36. template<typename... Args>
  37. void bar(Args... args) {
  38.     detail::bar(std::index_sequence_for<Args...>(), std::forward_as_tuple(args...));
  39. }
  40.  
  41. int main() {
  42. 	bar(0, 1, 2, 3, 4, 5, 6);
  43.  
  44. }
Success #stdin #stdout 0s 3096KB
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 0 1 42 3 4 5 6
https://ideone.com/HkLiKM
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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