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  1. #include <iostream>
  2. #include <cstring>
  3. #include <sstream>
  4. using namespace std;
  5.  
  6. template<typename T>
  7. class Array {
  8. public:
  9.     Array(int rs, int cs)
  10.          :rows( rs ), cols( cs )
  11.     {
  12.         const int Length = rows * cols;
  13.  
  14.         v = new T[ Length ];
  15.         memset( v, 0, Length * sizeof( T ) );
  16.     }
  17.  
  18.     ~Array()
  19.     {
  20.        delete[] v;
  21.     }
  22.  
  23.     T &cell(int row, int col)
  24.     {
  25.         return v[ ( row * cols ) + col ];
  26.     }
  27.  
  28.     void setRow(int r, T * data)
  29.     {
  30.     	memcpy( v + ( cols * r ), data, cols * sizeof( T ) );
  31.     }
  32.  
  33.     string toString()
  34. 	{
  35. 		const int Length = rows * cols;
  36. 		ostringstream cnvt;
  37.  
  38. 		for(int i = 0; i < Length; ++i) {
  39. 			cnvt << v[ i ];
  40. 			if ( ( i + 1 ) % cols == 0 ) {
  41. 				cnvt << '\n';
  42. 			}
  43. 		}
  44.  
  45. 		return cnvt.str();
  46. 	}    
  47.  
  48. private:
  49.     T * v;
  50.     int rows;
  51.     int cols;
  52. };
  53.  
  54. int main() {
  55. 	int data[][4] = {{2,1,2,1},
  56. 				{1,2,2,2},
  57. 				{1,1,1,1},
  58. 				{2,1,1,2}};
  59. 	Array<int> array( 4, 4 );
  60.  
  61. 	array.setRow( 0, data[ 0 ] );
  62. 	array.setRow( 1, data[ 1 ] );
  63. 	array.setRow( 2, data[ 2 ] );
  64. 	array.setRow( 3, data[ 3 ] );
  65.  
  66. 	cout << array.toString() << endl;
  67. 	return 0;
  68. }
  69.  
Success #stdin #stdout 0s 3432KB
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2121
1222
1111
2112
https://ideone.com/VC6prB
Matrix using contiguous memory.
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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