G ++未定义对类::函数的引用 [英] G++ undefined reference to class::function

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问题描述

我终于绝望了.因此,在我的 c++ 课程中,我们被指示使用类.我们会让头文件声明类和函数,而单独的 .cpp 文件实现它.事情应该是有效的,但他们没有,而且网络上没有任何解决方案似乎对我有用.为此,我在 linux 上使用 G++ 编译器,它似乎不适用于 IDE 或普通命令行.

我在 TBook.h 中遇到的错误是:

/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o:在函数`_start'中:(.text+0x20): 未定义的对main"的引用/tmp/ccxqI6An.o:在函数TBook::TBook()"中:TBook.cpp:(.text+0x3b): 未定义对 `Telephone::Telephone()' 的引用TBook.cpp:(.text+0x100): undefined reference to `Telephone::Telephone()'TBook.cpp:(.text+0x132): 未定义引用 `Telephone::allNum(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'TBook.cpp:(.text+0x182): undefined reference to `Telephone::~Telephone()'TBook.cpp:(.text+0x191): undefined reference to `Telephone::~Telephone()'TBook.cpp:(.text+0x2b3): undefined reference to `Telephone::~Telephone()'TBook.cpp:(.text+0x2e6): undefined reference to `Telephone::~Telephone()'TBook.cpp:(.text+0x2fa): undefined reference to `Telephone::~Telephone()'/tmp/ccxqI6An.o:TBook.cpp:(.text+0x370): 更多未定义的对 `Telephone::~Telephone()' 的引用如下/tmp/ccxqI6An.o:在函数TBook::write()"中:TBook.cpp:(.text+0x4e1): 未定义对 `Telephone::getNumber()' 的引用TBook.cpp:(.text+0x506): 未定义对 `Telephone::getAreaCode()' 的引用TBook.cpp:(.text+0x53a): 未定义对 `Telephone::getName()' 的引用/tmp/ccxqI6An.o:在函数TBook::lookup(std::basic_string, std::allocator>, std::basic_string<char,std::char_traits<char>,std::allocator<char>>)'/tmp/ccxqI6An.o:在函数TBook::print()"中:TBook.cpp:(.text+0x880): 未定义对 `Telephone::getName()' 的引用TBook.cpp:(.text+0x8e0): 未定义对 `Telephone::getNumber()' 的引用TBook.cpp:(.text+0x8ff): 未定义对 `Telephone::getAreaCode()' 的引用collect2: ld 返回 1 个退出状态[在 0.3 秒内完成,退出代码为 1]

我有点不喜欢文件没有接收任何 Telephone 类的方法.TBook.h 的代码如下所示:

#ifndef TBOOK_H#define TBOOK_H#include "电话.h"类 TBook{私人的:电话通讯录[10];国际电流;最大整数;上市:书();〜TBook();无效添加(电话);无效写入();布尔 is_full();无效打印();无效检查();电话查询(字符串);};#万一

这就是 TBook.cpp 的样子:

#include <iostream>#include <fstream>#include <字符串>#include "TBook.h"#include "电话.h"使用命名空间标准;TBook::TBook(){当前= 0;最大值 = 9;cout <<你好"<<结束;字符串线;ifstream myfile ("rolodex.txt");如果(myfile.is_open()){while ( getline (myfile,line) ){cout <<行 <<结束;电话 t;t.allNum(行);添加(t);}我的文件.close();}否则如果(!myfile.is_open()){我的文件流;myfile.open("rolodex.txt");我的文件 <<这是一个空文件(相对而言).";我的文件.close();}}TBook::~TBook(){}void TBook::add(电话 tel){如果(!is_full()){rolodex[当前] = 电话;当前++;}}无效的 TBook::write(){我的文件流;myfile.open("rolodex.txt");for (int i = 0; i < 当前; ++i){我的文件 <

由于问题似乎与 Telephone 类有关,我想我也应该显示该代码

<块引用>

电话.h

..

#ifndef TELEPHONE_H#define TELEPHONE_H#include <iostream>#include <字符串>使用标准::字符串;类电话{私人的:字符串名称;字符串编号;int areaCode;上市:电话(整数,字符串,字符串);电话();〜电话();bool setAreaCode(int);//二传手无效集合名称(字符串);无效集数(字符串);bool allNum(字符串);//吸气剂字符串 getName();字符串 getNumber();int getAreaCode();//检查bool checkX(int);bool checkY(int);};#万一

<块引用>

电话.cpp

..

#include <iostream>#include <字符串>#include <stdio.h>#include <stdlib.h>#include "电话.h"使用命名空间标准;电话::电话(){区号 = 0名称 = "";数 = "";}Telephone::Telephone(int aCode, string nam, string number){areaCode = aCode;名字=名字;}电话::~电话(){//不,纳达}bool Telephone::allNum(string all){size_t 找到 = all.find_first_of(",");//string first = all.substr(0, found);string second = all.substr((found)+1, found+1);第三个字符串 = all.substr(all.find_last_of(",")+1, all.length());整数 x, y;//将字符串转换为int值如果(第三个长度()== 7){x = atoi(third.substr(0,3).c_str()),y = atoi(third.substr(3,4).c_str());}别的{cerr <<您的电话号码无效"<<结束;}int ac = atoi(second.substr(0, second.length()).c_str());设置名称(第一个);如果(!setAreaCode(ac)){设置区域代码(100);返回真;}if (!checkX(x) || !checkY(y)){setNumber("1000000");}别的{setNumber(第三个);}cerr <<"提供的信息无效" <<结束;返回假;}void Telephone::setNumber(string number){数字=数字;}布尔电话::setAreaCode(int aCode){if(aCode >= 100 && aCode <= 999){areaCode = aCode;返回真;}返回假;}void Telephone::setName(string theName){名称 = 名称;}布尔电话::checkX(int x){如果(x >= 100 && x <= 999){返回真;}cerr <<"前三位无效" <<结束;返回假;}布尔电话::checkY(int y){如果(y >= 0000 && y <= 9999){返回真;}cerr <<"后四位无效" <<结束;返回假;}//吸气剂字符串电话::getName(){返回名称;}字符串电话::getNumber(){返回号码;}int 电话::getAreaCode(){返回区号;}

我的主文件(也称为 test.cpp)如下所示:

<块引用>

test.cpp

#include <iostream>#include <字符串>#include "TBook.h"#include "电话.h"使用命名空间标准;int main(int argc, char const *argv[]){//创建一个通讯录TBook 地址簿;返回0;}

我在 test.cpp 中也遇到了这个错误

/tmp/ccl8anRb.o:在函数main"中:test.cpp:(.text+0x24): 未定义对 `TBook::TBook()' 的引用test.cpp:(.text+0x38): 未定义对 `TBook::~TBook()' 的引用collect2: ld 返回 1 个退出状态

我认为这主要是一个编译错误,但我仍然不确定,我觉得我是模因我的代码不起作用,我不知道为什么"的设置.通常我会 bash 代码并尝试不同的方法直到它起作用,但我根本没有时间.因此我需要你的帮助.

解决方案

这是一个链接器错误.试试:

g++ test.cpp Telephone.cpp -o test

基本上,链接器抱怨您使用但没有提供实现的函数.要查看编​​译器为您执行的所有步骤,请输入 -v:

g++ -v test.cpp Telephone.cpp -o test

I'm finally pretty desperate. So, in my c++ class we were instructed to use classes. We'd have the header file declare the class and functions while a separate .cpp file implements the it. Things should be working, but they're not and no solutions on the web seem to be working for me. I'm using the G++ compiler on linux for this, and it doesn't seem to work on either IDE's or the normal command line.

The error I'm getting in my TBook.h is this:

/usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/ccxqI6An.o: In function `TBook::TBook()':
TBook.cpp:(.text+0x3b): undefined reference to `Telephone::Telephone()'
TBook.cpp:(.text+0x100): undefined reference to `Telephone::Telephone()'
TBook.cpp:(.text+0x132): undefined reference to `Telephone::allNum(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
TBook.cpp:(.text+0x182): undefined reference to `Telephone::~Telephone()'
TBook.cpp:(.text+0x191): undefined reference to `Telephone::~Telephone()'
TBook.cpp:(.text+0x2b3): undefined reference to `Telephone::~Telephone()'
TBook.cpp:(.text+0x2e6): undefined reference to `Telephone::~Telephone()'
TBook.cpp:(.text+0x2fa): undefined reference to `Telephone::~Telephone()'
/tmp/ccxqI6An.o:TBook.cpp:(.text+0x370): more undefined references to `Telephone::~Telephone()' follow
/tmp/ccxqI6An.o: In function `TBook::write()':
TBook.cpp:(.text+0x4e1): undefined reference to `Telephone::getNumber()'
TBook.cpp:(.text+0x506): undefined reference to `Telephone::getAreaCode()'
TBook.cpp:(.text+0x53a): undefined reference to `Telephone::getName()'
/tmp/ccxqI6An.o: In function `TBook::lookup(std::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
TBook.cpp:(.text+0x6d4): undefined reference to `Telephone::getName()'
TBook.cpp:(.text+0x79e): undefined reference to `Telephone::Telephone(int, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/tmp/ccxqI6An.o: In function `TBook::print()':
TBook.cpp:(.text+0x880): undefined reference to `Telephone::getName()'
TBook.cpp:(.text+0x8e0): undefined reference to `Telephone::getNumber()'
TBook.cpp:(.text+0x8ff): undefined reference to `Telephone::getAreaCode()'
collect2: ld returned 1 exit status
[Finished in 0.3s with exit code 1]

I'm kind of not liking that the file is not receiving any of the Telephone class's methods. Here's what the code looks like for TBook.h:

#ifndef TBOOK_H
#define TBOOK_H

#include "Telephone.h"

class TBook{
private:
    Telephone rolodex[10]; 
    int current;
    int max;
public:
    TBook();
    ~TBook();
    void add(Telephone);
    void write();
    bool is_full();
    void print();
    void check();
    Telephone lookup(string);

};

#endif

And this is what TBook.cpp looks like:

#include <iostream>
#include <fstream>
#include <string>

#include "TBook.h"
#include "Telephone.h"


using namespace std;

TBook::TBook(){
    current = 0;
    max = 9;

    cout << "Hello" << endl;

    string line;
    ifstream myfile ("rolodex.txt");
    if (myfile.is_open()){
        while ( getline (myfile,line) ){
            cout << line << endl;
            Telephone t;
            t.allNum(line);
            add(t);

        }
        myfile.close();
    }else if (!myfile.is_open()){
        ofstream myfile;
        myfile.open ("rolodex.txt");
        myfile << "This is an empty file (Relatively).";
        myfile.close();
    }
}

TBook::~TBook(){

}

void TBook::add(Telephone tel){
    if (!is_full()){
        rolodex[current] = tel;
        current++;
    }
}

void TBook::write(){
    ofstream myfile;
    myfile.open ("rolodex.txt");
    for (int i = 0; i < current; ++i)
    {
        myfile << rolodex[i].getName() << "," << rolodex[i].getAreaCode() << "," << rolodex[i].getNumber() << "
";
    }
    myfile.close();
}

bool TBook::is_full(){
    if (current <= max){
        return false;
    }
    return true;
}

Telephone TBook::lookup(string lookName){
    for (int i = 0; i < current; ++i){
        if (rolodex[i].getName() == lookName){
            return rolodex[i];
        }
    }
    return Telephone(100, "", "1000000");
}

void TBook::print(){
    //Print the vairables
    for (int i = 0; i < current; ++i){
        cout << "Name: " << rolodex[i].getName() << endl;
    cout << "Number: (" <<  rolodex[i].getAreaCode() << ") " << rolodex[i].getNumber() << endl;
    }

}

void TBook::check(){
    cout << "the message" << endl;
}

Since the problem seems to be arising with the Telephone class, I figure I should also show that code too

Telephone.h

..

#ifndef TELEPHONE_H
#define TELEPHONE_H

#include <iostream>
#include <string>


using std::string;

class Telephone{
private:
    string name;
    string num;
    int areaCode;
public:
    Telephone(int, string, string);
    Telephone();
    ~Telephone();
    bool setAreaCode(int);

    //Setters

    void setName(string);
    void setNumber(string);
    bool allNum(string);

    //Getters
    string getName();
    string getNumber();
    int getAreaCode();

    //Checks
    bool checkX(int);
    bool checkY(int);


};

#endif

Telephone.cpp

..

#include <iostream>
#include <string>
#include <stdio.h>
#include <stdlib.h>

#include "Telephone.h"

using namespace std;

Telephone::Telephone(){
    areaCode = 0
    name = "";
    num = "";
}

Telephone::Telephone(int aCode, string nam, string number){
   areaCode = aCode;
   name = name;

}

Telephone::~Telephone(){
    //Nope Nada
}

bool Telephone::allNum(string all){
    size_t found =  all.find_first_of(",");

    //
    string first = all.substr(0, found);
    string second = all.substr((found)+1, found+1);
    string third = all.substr( all.find_last_of(",")+1, all.length());
    int x, y;
    //convert string to int values
    if(third.length() == 7){
        x = atoi(third.substr(0,3).c_str()), 
        y = atoi(third.substr(3,4).c_str());
    }else{
        cerr << "Your phone number is not valid" << endl;
    }   
    int ac = atoi(second.substr(0, second.length()).c_str());

    setName(first);
    if (!setAreaCode(ac)){  
        setAreaCode(100);
        return true;

    }
    if (!checkX(x) || !checkY(y)){
            setNumber("1000000");
        }else{
            setNumber(third);
    }

    cerr << "The info provided is not valid" << endl;
    return false;
}

void Telephone::setNumber(string number){
    num = number;
}

bool Telephone::setAreaCode(int aCode){
    if(aCode >= 100 && aCode <= 999){
        areaCode = aCode;
        return true;
    }
    return false;
}

void  Telephone::setName(string theName){
    name = theName;
}

bool Telephone::checkX(int x){
    if(x >= 100 && x <= 999){
        return true;
    }
    cerr << "First three digits are not valid" << endl;
    return false;
}

bool Telephone::checkY(int y){
    if(y >= 0000 && y <= 9999){
        return true;
    }
    cerr << "Last four digits are not valid" << endl;
    return false;
}



//Getters
string Telephone::getName(){
    return name;
}

string Telephone::getNumber(){
    return num;
}

int Telephone::getAreaCode(){
    return areaCode;
}

And my main file (also called test.cpp) looks like this:

test.cpp

#include <iostream>
#include <string>
#include "TBook.h"
#include "Telephone.h"

using namespace std;


int main(int argc, char const *argv[])
{
    //Create a Rolodex
    TBook addressBook;

    return 0;
}

I'm also getting this error with test.cpp

/tmp/ccl8anRb.o: In function `main':
test.cpp:(.text+0x24): undefined reference to `TBook::TBook()'
test.cpp:(.text+0x38): undefined reference to `TBook::~TBook()'
collect2: ld returned 1 exit status

I think this is mostly a compiling error, but I'm still not sure, and I feel like I'm the setup of the meme "My code doesn't work, and I don't know why." Usually I would bash the code and try different methods until it works, but I simply don't have the time. I therefore need your help.

解决方案

This is a linker error. Try:

g++ test.cpp Telephone.cpp -o test

Basically, the linker is complaining about functions you used but didn't provide an implementation for. To see all the steps the compiler performs for you, throw in a -v:

g++ -v test.cpp Telephone.cpp -o test

这篇关于G ++未定义对类::函数的引用的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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