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  1. #include <iostream>
  2. #include <array>
  3. #include <utility>
  4.  
  5. template <std::size_t ... Is>
  6. constexpr std::array<std::uint16_t, sizeof...(Is)> mersenne_numbers(std::index_sequence<Is...>)
  7. {
  8.     return {{ ((1u << Is) - 1u)... }};
  9. }
  10.  
  11. template <std::uint8_t N>
  12. constexpr std::array<std::uint16_t, N> mersenne_numbers()
  13. {
  14.     return mersenne_numbers(std::make_index_sequence<N>{});
  15. }
  16.  
  17. int main()
  18. {
  19. 	constexpr auto ns = mersenne_numbers<5>();
  20.     for (auto e : ns) {
  21.         std::cout << e << " ";
  22.     }
  23.     std::cout << std::endl;
  24. }
  25.  
Success #stdin #stdout 0s 3412KB
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0 1 3 7 15
https://ideone.com/pdRcjO
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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