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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. template <class T>
  6. class matrix {
  7. protected:
  8. 	unsigned long width;
  9. 	unsigned long height;
  10. 	vector<vector<T>> v;
  11. public:
  12. 	matrix(unsigned long val_height, unsigned long val_width) :
  13. 		height(val_height),
  14. 		width(val_width),
  15. 		v(vector<vector<T>>(height, vector<T>(width, 0))) // так
  16. 	{
  17. 		//или вместо инициализации
  18. 		//v.resize(height, vector<T>(width, 0));
  19. 	}
  20.  
  21. 	~matrix() {
  22. 		// у vector свой деструктор, который автоматически освободит память
  23. 	}
  24.  
  25. 	template <class U>
  26. 	friend ostream &operator << (ostream &s, const matrix<U> &m);
  27. };
  28.  
  29. template <class T>
  30. ostream &operator << (ostream &s, const matrix<T> &m) {
  31. 	for (int i = 0; i < m.height; i++) {
  32. 		for (int j = 0; j < m.width; j++) {
  33. 			s << m.v[i][j];
  34. 		}
  35. 		s << endl;
  36. 	}
  37. 	return s;
  38. }
  39.  
  40. int main() {
  41. 	matrix<int> a(2, 2);
  42. 	cout << a;
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/Nkd8j9
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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