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  1. #include <vector>
  2. #include <array>
  3. #include <numeric>
  4. #include <iostream>
  5.  
  6. template<int ... I>
  7. struct IndexSeq
  8. {
  9. };
  10.  
  11. template<int T, typename T> struct MakeIndexSeqImpl;
  12. template<int T, int ... H>
  13. struct MakeIndexSeqImpl<T, IndexSeq<H ...>>
  14. {
  15. 	typedef IndexSeq<H..., T> type;
  16. };
  17.  
  18. template<int N, int Init, int Step>
  19. struct MakeIndexSeq
  20. {
  21. 	typedef typename MakeIndexSeqImpl<(N - 1) * Step + Init, typename MakeIndexSeq<N - 1, Init, Step>::type>::type type;
  22. };
  23.  
  24. template<int Init, int Step>
  25. struct MakeIndexSeq<1, Init, Step>
  26. {
  27. 	typedef IndexSeq<Init> type;
  28. };
  29.  
  30. template<int ... I>
  31. constexpr std::array<int, sizeof ... (I)> MakeSeqImpl(IndexSeq<I ...> seq)
  32. {
  33. 	return std::array<int, sizeof ... (I)>{I ...};
  34. }
  35.  
  36. template<int I, int Step = 1, int Init = 0>
  37. constexpr std::array<int, I> MakeSeq()
  38. {
  39. 	return MakeSeqImpl(typename MakeIndexSeq<I, Init, Step>::type());
  40. }
  41.  
  42. int main()
  43. {
  44.    for (auto i : MakeSeq<20, 10, 10>())
  45.    {
  46.       std::cout << i << ' ';
  47.    }
  48. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200
https://ideone.com/qS87jN
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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