未定义的引用'Class :: Class' [英] Undefined reference to 'Class::Class'

问题描述

修复了以前的问题（请参阅我提出的另一个问题）。我已经宣布了更多的课程。

After fixing the previous problem (see my one other question that I have asked). I had declared more classes.

其中一个名为CombatAdmin，它执行各种操作:(头文件）

One of these is called CombatAdmin which does various things: (Header file)

#ifndef COMBATADMIN_H
#define COMBATADMIN_H

#include <string> // Need this line or it complains
#include <Player.h>
#include <Sound.h>
#include <Enemy.h>
#include <Narrator.h>
using namespace std;

class Enemy;
class Player;

class CombatAdmin // Code yet to be commented here, will come soon.
{
    public:
        CombatAdmin();
        void healthSet(double newHealth, string playerName);
        void comAdSay(string sayWhat);
        void playerFindsChest(Player *player,Weapon *weapon,Armour *armour);
        void youStoleOurStuffEncounter(Player *player);
        void comAdWarning(string enemyName);
        void comAdAtkNote(string attack, double damage,string target,string aggresor);
        void entDefeated(string entName);
        void comAdStateEntHp(string ent, double hp);
        void comAdStateScanResults(string enemyName, double enemyHealth);
        string doubleToString(double number);
        string intToString(int number);
        bool isRandEncounter();
        void randomEncounter(Player *player,Sound *sound,Narrator *narrator);
        bool combatRound(Player *player, Enemy *enemy, Sound *sound, bool ran);
        void playerFindsItem(string playerName,string itemName,double itemWeight,double playerWeight);
        void playerFindsGold(string playerName,double coinCnt,double playerCoinCnt);

};

#endif // COMBATADMIN_H

然后实例化为main。 cpp文件像这样：（main.cpp文件的代码段）

It is then instanced in the main.cpp file like this: (Snippet of the main.cpp file)

#include <iostream> // Required for input and output
#include <Item.h> // Item header file.
#include <Weapon.h> // Header files that I have made for my classes are needed for this program
#include <sstream> // Needed for proper type conversion functions
#include <windows.h> // for PlaySound() and other functions like sleep.
#include <time.h> // Needed to seed the rand() function.
#include <mmsystem.h> // Not sure about this one, possibly defunct in this program.
#include <stdio.h> // Needed for a similar kind of output as iostream for various functions error msgs.
#include <irrKlang.h> // The header file of the sound lib I am using in this program.
#include <Narrator.h> // The narrators's header file.
#include <Pibot.h> // Other header files of classes.
#include <Armour.h>
#include <Player.h>
#include <Weapon.h>
#include <CombatAdmin.h>

using namespace irrklang;

using namespace std;

// Forward referenced functions


void seedRandom(); // Seeds the random number so it will be random as apposed to pseudo random.
string getPlayerName(string temp); // Gets the player's new name.


int main(int argc, char* argv[])
{
    // Variables and object pointers declared here.
    CombatAdmin *comAd = new CombatAdmin(); // Handles combat.
    Narrator *narrator = new Narrator(); // The Narrator that says stuff
    Pibot *piebot = new Pibot(); // PIbot, the player's trusty companion

    string temp; // Temp string for input and output

但是，当我尝试编译项目时，以下错误：

However, when I try to compile the project, I get the following error:

C:\Documents and Settings\James Moran.HOME-B288D626D8\My Documents\C++ projects\Test Project\main.cpp|59|undefined reference to `CombatAdmin::CombatAdmin()'|

我使用的是Code :: Blocks IDE（ver 10.05），使用GNU GCC编译器。项目类型为控制台应用程序。我使用的是Windows XP 32位SP3。

I am using the Code::Blocks IDE (ver 10.05), with the GNU GCC compiler. The project is of type "Console application". I am using windows XP 32 bit SP3.

我已经尝试更改搜索目录以包括目标文件的位置，但没有成功。

I have tried changing to search directories to include where the object files are, but no success there.

从代码中可以看出，解释器和PIbot被实例化了。 （然后使用，未显示）

As can be seen from the code, the narrator and "PIbot" are instanced just fine. (then used, not shown)

我的问题是，因此，我需要做什么来阻止这些错误发生？当我在使用库之前遇到类似的Undefined reference to x错误。我刚刚忘了在Code :: Blocks中链接到他们，一旦我这样做，他们就会工作。

My question is, therefore, what do I need to do to stop these errors occurring? As when I encountered similar "Undefined reference to x" errors before using libraries. I had just forgotten to link to them in Code::Blocks and as soon as I did, they would work.

由于这个类是我自己的，我不是非常确定这一点。

As this class is of my own making I am not quite sure about this.

如果你需要更多关于代码的信息等。

Do say if you need more information regarding the code etc.

推荐答案

您已声明默认构造函数（CombatAdmin（）），从而阻止编译器自动生成它。因此，你需要1）从类中删除默认构造函数的声明，或2）提供一个实现。

You have declared the default constructor (CombatAdmin()) and thus prevented the compiler from automatically generating it. Thus, you either need to 1) remove declaration of the default constructor from the class, or 2) provide an implementation.

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