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  1. #include <iostream>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. template<typename Item>
  6. class matrix
  7. {
  8. public:
  9. 	matrix(size_t sx, size_t sy)
  10. 		: _sx(sx), _sy(sy), items(nullptr)
  11. 	{
  12. 		items = new Item[sx * sy];
  13. 		fill(items, items + sx * sy, 0);
  14. 		for (size_t xy = 0; xy < min(sx, sy); xy++) (*this)(xy, xy) = 1;
  15. 	}
  16.  
  17. 	~matrix() { delete[] items; }
  18. 	size_t sx() const { return _sx; }
  19. 	size_t sy() const { return _sy; }
  20.  
  21. 	const Item& operator()(size_t x, size_t y) const { return items[y * _sx + x]; }
  22. 	Item& operator()(size_t x, size_t y) { return items[y * _sx + x]; }
  23.  
  24. private:
  25. 	size_t _sx, _sy;
  26. 	Item* items;
  27. };
  28.  
  29. template<typename Item>
  30. ostream& operator <<(ostream& strm, const matrix<Item>& m)
  31. {
  32. 	for (size_t y = 0; y < m.sy(); y++)
  33. 		for (size_t x = 0; x < m.sx(); x++)
  34. 			(x > 0 ? strm << " " : (y > 0 ? strm << endl : strm)) << m(x, y);
  35. 	return strm;
  36. }
  37.  
  38. int main()
  39. {
  40. 	matrix<double> m(5, 5);
  41. 	m(3, 1) = 7;
  42. 	cout << m << endl;
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 4752KB
comments (?)
stdin
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Standard input is empty
stdout
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1 0 0 0 0
0 1 0 7 0
0 0 1 0 0
0 0 0 1 0
0 0 0 0 1
https://ideone.com/9WqOaZ
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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