[解決済み】「不完全な型 'class map' の使用は無効です」というエラーが発生しました。

質問

テキストベースのRPGゲームを作りたいのですが、以下のようなコードになります。

#include <iostream>
#include <string>
#include <cstdlib>
using namespace std;
class Map;
class Player
{
public:
    int health;
    int damage;
    int defense;
    int gems=0;
    string race;
    string name;
    string location;


};
class Enemy
{
    public:

    int ehealth;
    int edamage;
    int edefense;
    int echoice;

};
class combat
{
public:
    Map* mapobj;
    int damagedealt;
    Player playerobj;
    Enemy enemeyobj;
    string cchoice;
    string retry;

    void initial()
    {
        cout <<"A wild orc has appeared\n";
        cout <<"What do you do?\n";
        cout <<"---------------------------\n";
        cout <<"|-------------------------|\n";
        cout <<"|----Attack-----Defend----|\n";
        cout <<"|-------------------------|\n";
        cout <<"---------------------------\n";
        cin >>cchoice;
        this->battle();
    }
    void newturn()
    {
        cout <<"The orc is still alive!";
        cout <<"What do you do?";
        cout <<"\n---------------------------\n";
        cout <<"|-------------------------|\n";
        cout <<"|----Attack-----Defend----|\n";
        cout <<"|-------------------------|\n";
        cout <<"---------------------------\n";
        cin >>cchoice;
        this->battle();
    };
    void battle()
    {

        enemeyobj.echoice = rand() % 2;
        if (enemeyobj.echoice= 1)
        {
            if (cchoice=="Attack")
            {
            playerobj.damage;
            enemeyobj.ehealth=enemeyobj.ehealth-playerobj.damage;
            cout <<"You did "<<playerobj.damage<<" points of damge to the enemey.\n";
            if (enemeyobj.ehealth>0)
            {
                playerobj.health=enemeyobj.edamage-playerobj.health;
                cout <<"The enemyattacked you. You now have "<<playerobj.health<<" health";
                if (playerobj.health>0)
                {
                    this->newturn();
                }
                else if (playerobj.health<=0)
                {
                    cout <<playerobj.name<<"was killed\n";
                    cout <<"Game Over";

                }

            }
            else if (enemeyobj.ehealth<=0)
            {
                    cout <<"You have defeated the orc!";
                    if (playerobj.location=="a")
                    {
                        mapobj->relaypointa();
                    }

            }

            }
            else if (cchoice=="Defend")
            {
                damagedealt=enemeyobj.edamage-playerobj.defense;
                playerobj.health=damagedealt-playerobj.health;
                cout <<"You defend but the enemey was able to deal\n";
                cout <<damagedealt<<" points of damage your health is\n";
                cout <<playerobj.health;
                if (playerobj.health>0)
                {
                    this->newturn();
                }
                else if (playerobj.health<=0)
                {
                    cout <<playerobj.name<<"was killed\n";
                    cout <<"Game Over";
                }
            }
        }
        else if (enemeyobj.echoice=2)
        {
            if (cchoice=="Attack")
            {
             damagedealt=enemeyobj.edefense-playerobj.damage;
             enemeyobj.ehealth=enemeyobj.ehealth-damagedealt;
             cout <<"You did "<<damagedealt<<" points of damage to the enemey";
             if (enemeyobj.ehealth>0)
             {
                 this->newturn();
             }
             else if (enemeyobj.ehealth<=0)
             {
                 cout <<"You have defeated the orc!";
                 mapobj->relaypointa();
             }
            }
            else if (cchoice=="Defend")
            {
                cout <<"Both parties defended";
                this->newturn();
            }
        }
    }
    };





class Map
{
    public:
    combat combatobj;
    string mchoice;
    int espawn;
    Player playerobj;
    Enemy enemeyobj;
    void relaypointaespawn()
    {
    playerobj.location=="relaypointa";
    enemeyobj.ehealth = rand() % 50 + 100;
    enemeyobj.edamage = rand() % 50 + 75;
    enemeyobj.edefense = rand() % 50 + 50;
    combatobj.initial();
    }
    void relaypointa()
    {
        cout <<"You have found yourself at the\n";
        cout <<"mouth of a mighty river to the north\n";
        cout <<"What do you want to do?\n";


    }


    void relaypointb()
    {
    playerobj.location=="relaypointb";
    cout << "\n\n%%%%%%%%%%%%%%%%%%%%\n";
    cout << "%                  %\n";
    cout << "%   #Wild North#   %\n";
    cout << "%                  %\n";
    cout << "%%%%%%%%%%%%%%%%%%%%\n\n";
    cout <<"You have entered the wild north this is where your journey starts\n";
    cout <<"What would you like to do\n\n";
    cin >>mchoice;
    if (mchoice=="Travel")
    {
        cout <<"Where would you like to travel?\n";
        cin >>mchoice;
        if (mchoice=="North")
        {

        }
        else if (mchoice=="East")
        {

        }
        else if (mchoice=="South")
        {

        }
        else if (mchoice=="West")
        {
            this->relaypointaespawn();
        }
        else
        {
            cout <<"Invalid command\n\n";
            this->relaypointb();
        }
           }


    }
    void relaypointcespawn()
    {
        playerobj.location=="a";
        enemeyobj.ehealth = rand() % 50 + 100;
        enemeyobj.edamage = rand() % 50 + 75;
        enemeyobj.edefense = rand() % 50 + 50;
        espawn = rand() % 2;
    }
};

実行すると、エラーが発生します。

invalid use of incomplete type class Map

解決方法は？

の最初の使い方は Map の関数内です。 combat クラスがあります。それは Map が定義されているため、エラーが発生します。

フォワード宣言は、特定のクラスが後で定義されることを述べているだけなので、それを参照したり、オブジェクトへのポインターを持ったりしても問題ありません。しかし、前方宣言はそのクラスがどのようなメンバを持っているかは言わないので、コンパイラが判断する限りでは Map は完全に宣言されています。

解決策は、C++のパターンに従って、クラス宣言を .h ファイル、関数本体は .cpp . こうすることで、すべての宣言が最初の定義の前に表示され、コンパイラは何を扱っているのかがわかるようになります。