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  1. #include <iostream>
  2. #include <array>
  3.  
  4.     template<unsigned...>struct indexes{typedef indexes type;};
  5.     template<unsigned Max, unsigned...Is> struct make_indexes:make_indexes<Max-1, Max-1, Is...>{};
  6.     template<unsigned...Is> struct make_indexes<0, Is...>:indexes<Is...>{};
  7.     template<unsigned Max> using make_indexes_t = typename make_indexes<Max>::type;
  8.  
  9.     template<typename T, unsigned N, unsigned M, unsigned... Is>
  10.     std::array<T*, M> as_array_of_pointers( indexes<Is...>, T(&arr)[M][N] ) {
  11.       return { arr[Is]... };
  12.     };
  13.     template<typename T, unsigned N, unsigned M>
  14.     std::array<T*, M> as_array_of_pointers( T(&arr)[M][N] ) {
  15.       return as_array_of_pointers( make_indexes_t<M>{}, arr );
  16.     }
  17.  
  18. int main() {
  19. 	int test[2][3] = {1,2,3,4,5,6};
  20. 	for (auto&& level1:test) {
  21. 		for (auto&& level2:level1) {
  22. 			std::cout << level2 << ",";
  23. 		}
  24. 		std::cout << "\n";
  25. 	}
  26. 	for (auto&& level1:as_array_of_pointers(test)) {
  27. 		std::cout << level1[0] << ",";
  28. 		std::cout << level1[1] << ",";
  29. 		std::cout << level1[2] << "\n";
  30. 	}
  31. 	return 0;
  32. 	// your code goes here
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
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Standard input is empty
stdout
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1,2,3,
4,5,6,
1,2,3
4,5,6
https://ideone.com/snpTtH
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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