G ++未定義類的引用:: function

Question

我終於相當絕望。所以，在我的C++類中，我們被指示使用類。我們希望頭文件聲明類和函數，而單獨的.cpp文件實現它。事情應該是有效的，但他們不是，網絡上的解決方案似乎並沒有爲我工作。我在linux上使用G ++編譯器來做這件事，而且它似乎無論在IDE還是普通的命令行上都能正常工作。

我得到我TBook.h的錯誤是這樣的：

/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] 

我那種不喜歡該文件沒有收到任何的電話類的方法。下面的代碼是什麼樣子的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 

這是TBook.cpp的樣子：

#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() << "\n"; 
    } 
    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; 
} 

因爲這個問題似乎與電話類中產生的，我想我還應該顯示的代碼也

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; 
} 

我的主文件（也稱爲TEST.CPP）看起來是這樣的：

測試。 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; 
} 

我也收到此錯誤與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 

我認爲這主要是一個編譯錯誤，但我仍然不知道，我覺得我的模擬器的設置「我的代碼不起作用，我不知道爲什麼。」通常我會打破代碼，並嘗試不同的方法，直到它的工作，但我根本沒有時間。因此，我需要你的幫助。

Answer 1

這是一個鏈接錯誤。嘗試：

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

基本上，鏈接器抱怨你使用的函數，但沒有提供實現。看到所有的編譯器爲您執行的步驟，扔在一個-v：

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