如何删除map<char, map<char, char>> board_game、map<int, char> X_index和list<Node*>？
如何为类Tree、Node和Boardgame编写适当的析构函数？

class Search_tree {
    Node* root = nullptr;
    char playerColor;
    list<Node*> leaveNodes;
    
    // Constructor, functions ...

    ~ Search_tree(); <--?
}

class Node {
    Board_game* currentBoard = nullptr;
    Node* parent = nullptr;
    list<Node*> childs;

    // Constructor, functions ...

    ~Node(); <--?
}

class Board_game {
  public:
    // Boardgame
    map<char, map<char, char>> board_game;
    map<int, char> X_index;
    map<int, char> Y_index;
    // Figures
    Position figures[8];

    // Constructor, functions ...

    ~Board_game(); <--?
}

struct Position {
    char x;
    char y;
};