我如何从多维向量中提取数据

Question

/tmp/ccQQwq6l.o: 在函数main': hw4.cpp:(.text+0x7d): undefined reference towritepass(std::vector >, std::vector, std::allocator > >&)' collect2：错误：ld 返回 1 个退出状态

代码如下

#include<iostream>
#include<cstdlib>
#include<string>
#include<fstream>
#include<ctime>
#include<vector>
using namespace std;

//cout << "test1\n";

vector<pair<string,string> > readnames();
vector<string> readpasswords();
vector<string> randpasswords(vector<string>&);
int writepass(vector<string>, vector<pair<string,string> >&);

vector<string> passwords;
vector<pair<string,string> > names;
vector<string> randpass;

int main()
{
        readnames();
        readpasswords();
        randpasswords(passwords);
        writepass(randpass, names);
//      writepass(randpasswords(readpasswords()), readnames());
        return 0;
}

这会读取我 cpu 上文件的名称

vector<pair<string,string> > readnames()
{
        vector<pair<string,string> > names;
        ifstream indata;
        indata.open("employees.txt");

        while (true)
        {
                pair<string, string> name;
                if (!(indata >> name.first >> name.second))
                        break;
                names.push_back(name);
        }

        indata.close();

        return names;
}

这会从我的 cpu 上的文件中读取密码

vector<string> readpasswords()
{
        vector<string> passwords;
        ifstream indata;
        indata.open("passwords.txt");

        while(!indata.eof())
        {
                string password;
                if (!(indata >> password))
                        break;
                passwords.push_back(password);

        }
        indata.close();
         return passwords;
}

这个功能我还不关心

vector<string> randpasswords(vector<string>& passwords)
{
        vector<string> randpass;
        vector<string> rand;
        srand (time(NULL));
        return randpass;
}

这似乎产生了问题

int writepass(vector<string>& randpass, vector<pair<string,string> >& names)
{
        ofstream outdata;
        outdata.open("empPasswords.txt");
        for(int i = 0; i < randpass.size();i++)
        {
        outdata << names[i].first << " " << names[i].second << " " << randpass[i] << endl;
        }
        outdata.close();
        return 0;
}

Answer 1

请参阅用户 4581303 以获取答案，这是一个错字