q16.4_incomplete.cpp

#include <cassert>
#include <iostream>

using namespace std;

enum BoxState { EMPTY = 0, STATE1 = 1, STATE2 = 2 };

class TicTacBoard {
  const int n;

public:
  BoxState *board;

  TicTacBoard();
  TicTacBoard(int);
  int getBoardSize();
  void createBoard();
  void checkInputValid(int, int);
  BoxState getState(int, int);
  BoxState modifyState(int, int, BoxState);

  ~TicTacBoard();
};

TicTacBoard::TicTacBoard() : n(3), board(new BoxState[n * n]) {}
// TicTacBoard::TicTacBoard(int n) : n(n), board{new BoxState[n][n]} {}
TicTacBoard::TicTacBoard(int n) : n(n), board(new BoxState[n * n]) {}
TicTacBoard::~TicTacBoard() { delete[] board; }

int TicTacBoard::getBoardSize() { return n; }

void checkInputValid(int row, int col) {
  assert((row >= n, "row exceeded the range of n", col >= n,
          "col exceeded range of n"));
  return;
}

BoxState TicTacBoard::getState(int row, int col) {
  checkInputValid(row, col);
  return board[row * n + col];
}

BoxState modifyState(int row, int col, BoxState newState) {
  checkInputValid(row, col);
  int index = row * n + col;
  BoxState ret_val = board[index];
  board[index] = newState;

  return ret_val;
}

int main([[maybe_unused]] int argc, [[maybe_unused]] char **argv) {

  TicTacBoard board; // array indexing from zero

  cout << board.getBoardSize() << '\n';
  cout << board.board[0] << '\n';

  return 0;
}