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  1. #include <iostream>
  2. #include <array>
  3. #include <cstdint>
  4.  
  5. struct Matrix
  6. {
  7. 	template<typename T, const uint32_t X, const uint32_t Y>
  8. 	static const std::array<std::array<T, Y>, X> IDENTITY()
  9. 	{
  10. 		//const int X = 5, Y = 5;
  11. 		std::array<std::array<int, Y>, X> mat{};
  12. 		for (int x = 0; x < X; ++x)
  13. 			mat[x][x] = 1;
  14.  
  15. 		return mat;
  16. 	}
  17. };
  18. int main()
  19. {
  20. 	std::array<std::array<int, 5>, 5> id = Matrix::IDENTITY<int, 5, 5>();
  21.  
  22.  
  23. 	for (auto& a : id)
  24. 	{
  25. 		for (auto i : a)
  26. 		{
  27. 			std::cout << "[" << i << "]";
  28. 		}
  29. 		std::cout << std::endl;
  30. 	}
  31. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin
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Standard input is empty
stdout
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[1][0][0][0][0]
[0][1][0][0][0]
[0][0][1][0][0]
[0][0][0][1][0]
[0][0][0][0][1]
https://ideone.com/bvkIx8
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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