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  1. #include <iostream>
  2. #include <utility>
  3. #include <array>
  4. #include <cstddef>
  5.  
  6.  
  7. template <typename F, std::size_t... I>
  8. constexpr auto generate (F&& f, std::index_sequence<I...>) -> std::array<decltype(std::forward<F> (f) (0)), sizeof...(I)> {
  9. 	return {{ std::forward<F> (f) (I) ... }};
  10. }
  11.  
  12. template <std::size_t S, typename F>
  13. constexpr auto generate (F&& f) -> std::array<decltype(std::forward<F> (f) (0)), S> {
  14. 	return generate (std::forward<F> (f), std::make_index_sequence<S> {});
  15. }
  16.  
  17. constexpr int myLutCalc (std::size_t index) {
  18. 	return index * 2;
  19. }
  20.  
  21. constexpr auto myLUT = generate<10> (myLutCalc);
  22.  
  23. int main() {
  24. 	for (auto& x : myLUT) {
  25. 		std::cout << x << ", ";
  26. 	}
  27. 	std::cout << std::endl;
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin 
Standard input is empty
stdout 
0, 2, 4, 6, 8, 10, 12, 14, 16, 18,
https://ideone.com/G3KuxT
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
secret

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