C++ Dynamic Memory Allocation (2D and 3D)
This snipped of code is for allocating memory when using a multidimensional array. The following examples are for 2D ([][]) and 3D ([][][]) structures.
First:
to allocate memory for a two dimensional structure: (i.e. int[][] array)
1 2 3 4 5 6 7 8 9 | int** array; // 2D array definition; // begin memory allocation array = new int*[dimX]; for(int x = 0; x < dimX; ++x) { array[x] = new int[dimY]; for(int y = 0; y < dimY; ++y) { // initialize the values, this is optional, but recommended array[x][y] = 0; } } |
Next, to allocate memory for a three dimensional structure: (i.e. int[][][] array)
1 2 3 4 5 6 7 8 9 10 11 12 | int*** array; // 3D array definition; // begin memory allocation array = new int**[dimX]; for(int x = 0; x < dimX; ++x) { array[x] = new int*[dimY]; for(int y = 0; y < dimY; ++y) { array[x][y] = new int[dimZ]; for(int z = 0; z < dimZ; ++z) { // initialize the values, again, not necessary, but recommended array[x][y][z] = 0; } } } |