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  1. template<unsigned int...>
  2. struct IndexList{
  3. };
  4.  
  5. template<class IndexList, unsigned int LAST> struct Append;
  6.  
  7. template<unsigned int... FIRST, unsigned int LAST>
  8. struct Append<IndexList<FIRST...>, LAST> {
  9.   typedef IndexList<FIRST..., LAST> Result;
  10. };
  11.  
  12. template<unsigned int N>
  13. struct Indices {
  14.   typedef typename Append<typename Indices<N - 1U>::Result, N - 1U>::Result Result;
  15. };
  16.  
  17. template<>
  18. struct Indices<0U> {
  19.   typedef IndexList<> Result;
  20. };
  21.  
  22. template<unsigned int N>
  23. struct PowerOfTen {
  24.   static_assert(N < 20U, "Too large");
  25.   static const unsigned long long value = 10ULL * PowerOfTen<N - 1>::value;
  26. };
  27.  
  28. template<>
  29. struct PowerOfTen<0U> {
  30.   static const unsigned long long value = 1ULL;
  31. };
  32.  
  33. template<class IndexList> struct Values;
  34.  
  35. template<unsigned int... N>
  36. struct Values<IndexList<N...>> {
  37.   static const unsigned long long values[sizeof...(N)];
  38. };
  39.  
  40. template<unsigned int... N>
  41. const unsigned long long Values<IndexList<N...>>::values[sizeof...(N)] = {
  42.   PowerOfTen<N>::value...
  43. };
  44.  
  45. template<unsigned int N>
  46. using PowerOfTenTable = Values<typename Indices<N>::Result>;
  47.  
  48. #include <iostream>
  49.  
  50. int main() {
  51.   for (unsigned int i = 0; i < 10U; ++i) {
  52.     std::cout << PowerOfTenTable<10U>::values[i] << std::endl;
  53.   }
  54.   return 0;
  55. }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin 
Standard input is empty
stdout 
1
10
100
1000
10000
100000
1000000
10000000
100000000
1000000000
https://ideone.com/sAlBJg
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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