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如果我的问题很愚蠢，我正在制作一个基于文本的基本 RPG 抱歉，因为我是 C++ 新手。所以基本上我有一个小型战斗类，我必须从地图类来回链接，所以我不得不转发声明我的地图类，它会出现错误。顺便说一句，抱歉没有任何评论。
这是错误： invalid use of incomplete type class Map
#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 enemy";
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;
}
};
原文由 user2998425 发布，翻译遵循 CC BY-SA 4.0 许可协议
您第一次使用
Map是在combat类的一个函数中。这发生在Map被定义之前，因此出现错误。前向声明仅表示稍后将定义特定类，因此可以引用它或具有指向对象的指针等。但是，前向声明并未说明类具有哪些成员，就编译器而言，您在
Map完全声明之前，不能使用它们中的任何一个。解决方案是遵循
.h文件中的类声明的 C++ 模式和.cpp中的函数体。这样，所有声明都出现在第一个定义之前，编译器知道它正在使用什么。