incompatible types in assignment?

[kardon33]

I am getting a "error: incompatible types in assignment" error and cant figure out why? I am trying to set lastRow to row at the end of the code snippet.

    int row[height][3];
    int lastRow[height][3];
 
    size_t rowIdx, idx = 0;
    int cRow = startX;
    for (idx = startX ; idx < height*width; idx += width)
    {
      cRow = (idx/width);
 
      row[cRow][0] = redImg.data[idx]; 
      row[cRow][1] = greenImg.data[idx] ;    
      row[cRow][2] = blueImg.data[idx]; 
 
    }
 
    lastRow = row;
 

[Banfa]

C/C++ does not support arithmetic operations on arrays including copying.

If this is C then use memcpy.

If this is C++ you should be using vectors not arrays (which do support copying).

[donbock]

Another approach would be to have two generically named arrays plus two pointer-to-array variables called row and lastRow. Instead of copying the row array you could swap the pointer values.

However, working with a pointer to a two-dimensional array can be quite tricky. If you're interested in this approach you should first read Arrays Revealed.