Time for action – implementing the game board class

Now we will focus on our data structure. Add a new private member to ChessBoard, a vector of characters that will contain information about pieces on the board:

QVector<char> m_boardData;

Consider the following table that shows the piece type and the letters used for it:

Piece type		White	Black
	King	K	k
	Queen	Q	q
	Rook	R	r
	Bishop	B	b
	Knight	N	n
	Pawn	P	P

You can see that white pieces use upper-case letters and black pieces use lower-case variants of the same letters. In addition to that, we will use a space character (0x20 ASCII value) to denote that a field is empty. We will add a protected method for setting up an empty board based on the number of ranks and columns on the board and a boardReset() signal to inform that the position on the board has changed:

void ChessBoard::initBoard()
{
  m_boardData.fill(' ', ranks()*columns());
  emit boardReset();
}

We can update our methods for setting...