下面是一個簡單的C++實現五子棋的示例代碼：

#include <iostream>
#include <vector>

const int BOARD_SIZE = 15;
enum class Player { None, Black, White };

class FiveChess {
private:
    std::vector<std::vector<Player>> board;

public:
    FiveChess() : board(BOARD_SIZE, std::vector<Player>(BOARD_SIZE, Player::None)) {}

    void printBoard() {
        for (int i = 0; i < BOARD_SIZE; i++) {
            for (int j = 0; j < BOARD_SIZE; j++) {
                switch (board[i][j]) {
                    case Player::None:
                        std::cout << ".";
                        break;
                    case Player::Black:
                        std::cout << "X";
                        break;
                    case Player::White:
                        std::cout << "O";
                        break;
                }
                std::cout << " ";
            }
            std::cout << std::endl;
        }
    }

    bool checkWin(Player player) {
        // TODO: 實現判斷player是否獲勝的邏輯
        return false;
    }

    void play(int row, int col, Player player) {
        board[row][col] = player;
        printBoard();
        if (checkWin(player)) {
            std::cout << (player == Player::Black ? "Black" : "White") << " wins!" << std::endl;
        }
    }
};

int main() {
    FiveChess game;
    game.play(7, 7, Player::Black); // 黑棋下在(7, 7)位置
    game.play(8, 8, Player::White); // 白棋下在(8, 8)位置
    // 繼續下棋...

    return 0;
}

上述代碼演示了一個簡單的五子棋游戲，主要實現了棋盤的打印、下棋和判斷勝利等功能。在play方法中，通過傳入玩家的行列坐標和玩家類型，即可在指定位置下對應的棋子，并判斷勝負。實際運行時，玩家可以交替在棋盤上下棋，直到有一方獲勝或平局為止。