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  1. #include <iostream>
  2. #include <vector>
  3. #include <utility>
  4. using namespace std;
  5.  
  6. template <class T>
  7. class Matrix {
  8. 	vector<vector<T>> m; 
  9. public: 
  10.     Matrix (int r, int c) : m(r, vector<int>(c, T())) { }
  11.     void show() {
  12.     	cout << "Matrix("<<m.size()<<","<<m[0].size()<<")"<<endl;
  13.     	for (int i=0; i<m.size(); i++) {
  14.     		cout <<"  ";
  15.     		for (int j=0; j<m[i].size(); j++)
  16.     		    cout << m[i][j]<<" ";
  17.     		cout<<endl; 
  18.     	}
  19.     }
  20.     vector<T>& operator[] (int r) { return m[r]; }
  21.     T& operator[] (pair<int, int> p) { return m[p.first][p.second]; }
  22.     T& operator() (int r, int c) { return m[r][c]; }
  23. };
  24.  
  25.  
  26. int main() {
  27. 	Matrix<int> a(2,2);
  28. 	a.show(); 
  29.  
  30. 	a[{0,0}] = 3;
  31. 	int b = a[{1,0}];
  32. 	a.show(); 
  33.  
  34. 	a[0][1] = 4;
  35. 	int c = a[0][1];
  36. 	a.show(); 
  37.  
  38. 	a(1,0) = 5;
  39. 	int e = a(1,0);
  40. 	a.show(); 
  41.  
  42.  
  43. 	return 0;
  44. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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Matrix(2,2)
  0 0 
  0 0 
Matrix(2,2)
  3 0 
  0 0 
Matrix(2,2)
  3 4 
  0 0 
Matrix(2,2)
  3 4 
  5 0
https://ideone.com/fgWG2T
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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