/// <summary> <!-- {{{1 --> Constructor
/// </summary>
/// <param name="idx"></param>
public Cell(SudokuCellIndex idx)
{
idx.AssertWhenInvalid();
this.index = idx;
this.candidate = new Candidates();
this.value = SudokuValue.NA;
}
/// <summary> <!-- {{{1 --> Get cell from cell index
/// </summary>
/// <param name="idx"></param>
/// <returns></returns>
public Cell CellFromIndex(SudokuCellIndex idx)
{
idx.AssertWhenInvalid();
return(this.board.ElementAt(idx.ToInt()));
}