I am making a TicTacToe game (fairly easy I know but I am a beginner) and I am almost done, my problem now is I am trying to have it check if a row, a column or a diagonal of the table have the same value, and recursively keep playing if it is not. My board looks like this :

char xToken = 'x';
char oToken = 'o';
char vertical = '|';
char horizontal = '-';

class Board {
public:
    const static int rows = 6;
    const static int cols = 6;
    char grid[rows][cols]{};

    Board() {
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                grid[i][0] = '0' + i;
                grid[0][j] = '0' + j;

                if (j == 2 || j == 4) {
                    grid[i][j] = vertical;
                }

                if (i == 2 || i == 4) {
                    grid[i][j] = horizontal;
                }
            }
        }
    }

    void printBoard() {
        for (auto & i : grid) {
            for (char j : i) {
                cout << j << "t";
            }
            cout << endl;
        }
    }
}

This is my play() function:

void play() {
        int i = 0;
        int j = 0;

        cout << "choose index you want to play in" << endl;
        cout << "Player 1" << endl;
        cout << "Row: " << endl;
        cin >> i;
        cout << "Column: " << endl;
        cin >> j;
        cout << i << ", " << j << endl;
        if (Board().grid[i][j] != vertical && Board().grid[i][j] != horizontal) {
            grid[i][j] = xToken;
            printBoard();
        }

        cout << "choose index you want to play in" << endl;
        cout << "Player 2" << endl;
        cout << "Row: " << endl;
        cin >> i;
        cout << "Column: " << endl;
        cin >> j;
        cout << i << ", " << j << endl;
        if (Board().grid[i][j] != vertical && Board().grid[i][j] != horizontal) {
            grid[i][j] = oToken;
            printBoard();
        }

        if(grid[i][j] == xToken) {
            cout << "You Win!" << endl;
        } else
            play();
    }

The idea is I am trying to recursively keep playing if we don’t have 3 elements in a row, column or diagonal that are the same value. The very problem now is to find how to read the board so it can find the 3 in a row so the game stops