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The isCollision() function

The second section of code contains logic to detect collisions:

bool Board::isCollision(const Piece &piece) const {    for (int column = 0; column < PieceSize; ++column) {        for (int row = 0; row < PieceSize; ++row) {            if (piece.isBlock(column, row)) {                int columnTarget = piece.getColumn() + column;                int rowTarget = piece.getRow() + row;                if (                    columnTarget < 0                    || columnTarget >= BoardColumns                    || rowTarget < 0                    || rowTarget >= BoardRows                ) {                    return true;                }                if (cells_[columnTarget][rowTarget]) return true;            }        }    }    return false;}

The isCollision() function loops through each cell on the board until it reaches one populated by the &piece passed as an argument. If the piece is about to collide with either side of the board or it has ...