未定義的參考錯誤

我遇到未定義的參考錯誤。我收到以下錯誤：未定義的參考錯誤

[Linker error] undefined reference to `operator>>(std::istream&, Voter&)' 
[Linker error] undefined reference to `Voter::~Voter()' 
[Linker error] undefined reference to `Voter::~Voter()' 
ld returned 1 exit status

我使用的流血開發的C++ 4.9

我的代碼：

Voter.h

#include <iostream> 
#ifndef VOTER_H 
#define VOTER_H 

using namespace std; 
class Voter 
{ 
     private: 
       string ID; 
       int nr_times_voted; 
       bool voted; 

     public: 
      Voter() 
      { 
       ID = " "; 
       nr_times_voted = 0; 
       voted = false; 
      } 

      Voter(string newVoter) 
      { 
       ID = "0000"; 
       nr_times_voted = 0; 
       voted = false; 
      } 

       ~Voter();  
       string getID(); 
       int getnr_times_voted(); 
       bool getvoted(); 
       void set_voted() 
       { 
       voted = true; 
       } 

       friend Voter operator++(Voter& V); 
       friend istream & operator>>(istream & ins, Voter & V); 
       friend ostream & operator<<(ostream & outs, Voter & V); 
}; 
#endif

ClassVoter.cpp

#include "Voter.h" 
    #include <iostream> 
    #include <string> 

    using namespace std; 

    //Accessors to retrieve data from each of the member variables 
    string Voter:: getID() 
    { 
     return ID; 
    } 

    int Voter:: getnr_times_voted() 
    { 
     return nr_times_voted; 
    } 

    bool Voter:: getvoted() 
    { 
     return voted; 
    } 

    //destructor 
    Voter::~Voter() 
    {} 

    void operator++(voted & V) 
    { 
     voted++; 
     return voted;  
    } 

    istream & operator >>(istream & ins, Voter & V) 
    { 
     ins >> V.ID >> V.nr_times_voted >> V.voted; 
    } 


    ostream & operator <<(ostream & outs, Voter & V) 
    { 
     outs << " Voters that want to vote: " << endl; 
     outs << V.ID << endl; 
     return outs; 
    }

TestVoter.cpp

#include "Voter.h" 
#include <iostream> 
#include <fstream> 
#include <cstdlib> 
#include <string> 

using namespace std; 

int main() 
{ 
    ifstream infile; 
    ofstream outfile; 
    Voter ID; 

    cout << "Enter your Voter ID: "; 
    cin >> ID; 

    infile.open("VotersRoll.dat"); 
    outfile.open("UpdatedVoters.dat"); 

    infile.close(); 
    outfile.close(); 

    system("pause"); 
    return 0; 
}

來源

2013-03-29 user1291092

你不是從'ClassVoter.cpp生成的目標文件鏈接'。做。 – gspr

你可以在「[鏈接器錯誤]未定義的引用'運營商>>（std :: istream＆，Voter＆）'」之前發佈行，哪些參數傳遞給ld？ – MLeblanc

您可以嘗試將ClassVoter.o目標文件鏈接到最終圖像中。 – WhozCraig