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  1. #include <array>
  2. #include <iostream>
  3. #include <utility>
  4.  
  5. template<int VRange, int VRepCount, int VValueRIndex = VRepCount> class
  6. t_Looper
  7. {
  8. 	public: template<typename TAction> static void
  9. 	process(::std::array<int, VRepCount> & values, TAction && action)
  10. 	{
  11. 		for(;;)
  12. 		{
  13. 			t_Looper<VRange, VRepCount, VValueRIndex - 1>::process(values, ::std::forward<TAction>(action));
  14. 			auto & value{values[VRepCount - VValueRIndex]};
  15. 			if((VRange - 1) != value)
  16. 			{
  17. 				++value;
  18. 			}
  19. 			else
  20. 			{
  21. 				value = 0;
  22. 				break;
  23. 			}
  24. 		}
  25. 	}
  26. };
  27.  
  28. template<int VRange, int VRepCount> class
  29. t_Looper<VRange, VRepCount, 0>
  30. {
  31. 	private: template<int... VIndexes, typename TAction> static void
  32. 	invoke(::std::integer_sequence<int, VIndexes...>, ::std::array<int, VRepCount> const & values, TAction && action)
  33. 	{
  34. 		action(values[VIndexes]...);
  35. 	}
  36.  
  37. 	public: template<typename TAction> static void
  38. 	process(::std::array<int, VRepCount> & values, TAction && action)
  39. 	{
  40. 		invoke(::std::make_integer_sequence<int, VRepCount>(), values, ::std::forward<TAction>(action));
  41. 	}
  42. };
  43.  
  44. template<int VRange, int VRepCount, typename TAction> void
  45. multiloop(TAction && action)
  46. {
  47. 	::std::array<int, VRepCount> values{};
  48. 	t_Looper<VRange, VRepCount>::process(values, ::std::forward<TAction>(action));
  49. }
  50.  
  51. int main()
  52. {
  53. 	multiloop<3, 2>([](int i, int j){::std::cout << i << " " << j << ::std::endl;});
  54. 	multiloop<3, 4>([](int i, int j, int k, int l){::std::cout << i << " " << j << " " << k << " " << l << ::std::endl;});
  55. 	return(0);
  56. }
  57.  
Success #stdin #stdout 0s 16064KB
comments ()
stdin
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Standard input is empty
stdout
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0 0
0 1
0 2
1 0
1 1
1 2
2 0
2 1
2 2
0 0 0 0
0 0 0 1
0 0 0 2
0 0 1 0
0 0 1 1
0 0 1 2
0 0 2 0
0 0 2 1
0 0 2 2
0 1 0 0
0 1 0 1
0 1 0 2
0 1 1 0
0 1 1 1
0 1 1 2
0 1 2 0
0 1 2 1
0 1 2 2
0 2 0 0
0 2 0 1
0 2 0 2
0 2 1 0
0 2 1 1
0 2 1 2
0 2 2 0
0 2 2 1
0 2 2 2
1 0 0 0
1 0 0 1
1 0 0 2
1 0 1 0
1 0 1 1
1 0 1 2
1 0 2 0
1 0 2 1
1 0 2 2
1 1 0 0
1 1 0 1
1 1 0 2
1 1 1 0
1 1 1 1
1 1 1 2
1 1 2 0
1 1 2 1
1 1 2 2
1 2 0 0
1 2 0 1
1 2 0 2
1 2 1 0
1 2 1 1
1 2 1 2
1 2 2 0
1 2 2 1
1 2 2 2
2 0 0 0
2 0 0 1
2 0 0 2
2 0 1 0
2 0 1 1
2 0 1 2
2 0 2 0
2 0 2 1
2 0 2 2
2 1 0 0
2 1 0 1
2 1 0 2
2 1 1 0
2 1 1 1
2 1 1 2
2 1 2 0
2 1 2 1
2 1 2 2
2 2 0 0
2 2 0 1
2 2 0 2
2 2 1 0
2 2 1 1
2 2 1 2
2 2 2 0
2 2 2 1
2 2 2 2
https://ideone.com/vVaPEX
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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