SudokuBoard-Initial.cpp

using cellQueue = queue<shared_ptr<SudokuCell>>;

class SudokuBoard {
    cellQueue cells;

public:
    // initialize board
    SudokuBoard(){/* ... */}
    // fill the board with valid solution
    void fillCells(){/* ... */}

    // take index and return 2d coord
    coord resolveIndex(int index) {
        return coord{
                index / SIZE,
                index % SIZE
        };
    }

    //Take coord and return index
    int resolvePosition(const coord &position) {
        return position.i * SIZE + position.j;
    }

    // get cell by index
    shared_ptr<SudokuCell> at(int index) {/* ... */}
    // get cell by coord
    shared_ptr<SudokuCell> at(coord position) {/* ... */}
};