fork download
copy 
  1. #include <iostream>
  2. #include <vector>
  3.  
  4. class My_vec {
  5. 	enum { ROWS = 0, COLS = 1};
  6. 	std::vector<int> v;
  7. 	int sz[2];
  8.  
  9. public:
  10. 	My_vec(int rows, int cols)
  11. 	:v(rows*cols)
  12. 	{
  13. 		sz[ROWS] = rows;
  14. 		sz[COLS] = cols;
  15. 	}
  16.  
  17. 	inline int* operator[](int n) {
  18. 		return &v[n*sz[ROWS]];
  19. 	}
  20. };
  21.  
  22. int main() {
  23. 	My_vec v {2, 2};
  24. 	for (auto i = 0; i < 2; ++i)
  25. 		for (auto j = 0; j < 2; ++j)
  26. 			v[i][j] = i * 2 + j;
  27.  
  28. 	for (auto i = 0; i < 2; ++i) {
  29. 		for (auto j = 0; j < 2; ++j)
  30. 			std::cout << v[i][j] << ' ';
  31. 		std::cout << '\n';
  32. 	}
  33. 	return 0;
  34. }
Success #stdin #stdout 0s 3468KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
0 1 
2 3
https://ideone.com/SM3Jer
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!