按字母顺序排序c++

我有一个以某种方式组织的电子游戏角色列表。我希望能够只从列表中取出他们的名字，并按字母顺序排序。

列表的格式为:

Last Name, First Name, Game, Relase Date, Score, Developer

列表如下:

Snake, Solid, Metal Gear Solid, 9/3/1998, 94, Konami
Drake, Nathan, Uncharted, 11/19/2007, 90, Naughty Dog
Guy, Doom, Doom, 5/13/1993, 95, iD

我想要的输出是:

Drake, Nathan
Guy, Doom
Snake, Solid

我只能按照它们在文本文件中的顺序打印出这些名称。我如何比较姓氏，然后打印出全名?

#include <fstream>
#include <iostream>
#include <string>
#include <time.h>
#include <cstdlib>
#include <sstream>
using namespace std;
ifstream inFile;
class Characher{
private:
    string first;
    string last;
public:
    Character(){};
    void getLast(){
    if(inFile.is_open()){
        getline(inFile, last,',');
    } else {
    cout<<"Hmm.."<<endl;
        }
    }
    void getFirst(){
    if(inFile.is_open()){
        getline(inFile, first,',');
    } else {
    cout<<"No First Name here..."<<endl;
        }
    }
    void printLast(){
    cout<<last<<",";
    }
    void printFirst(){
    cout<<first<<endl;
    }
};
class Dev{
private:
    string Developer;
public:
    Dev(){};//null constructor
    void printDeveloper(){
    cout<<"Developer: "<<Developer<<endl;
    }
    void getDeveloper(){
    if(inFile.is_open()){
        getline(inFile, Developer);
    } else {
    cout<<"Nothing here..."<<endl;
    }
    }
};
class Game{
private:
    string game;
public:
    Game(){};
    void getGameName(){
    if(inFile.is_open()){
       getline(inFile, game,',');
       } else{
       cout<<"What game was they frum?"<<endl;
       }
    }
    void printGame(){
    cout<<"Game: "<<game;
    }
};
class RelDate_And_Score{
private:
    string ReleaseDate;
    string Score;
public:
    RelDate_And_Score(){};
    void GetRelDate(){
    if(inFile.is_open()){
        getline(inFile, ReleaseDate, ',');
    } else{
    cout<<"Could not find Release Date"<<endl;}
    }
    void getScore(){
    if(inFile.is_open()){
        getline(inFile, Score, ',');
    } else{
    cout<<"Could not find Score"<<endl;}
    }
    void PrintDate(){
    cout<<"Release Date: "<<ReleaseDate<<" | ";}
    void PrintScore(){
        cout<<"Score: "<<Score<<endl;}
};
int main(){
    inFile.open("Games.dat");
    Dev d;
    Characher c;
    RelDate_And_Score r;
    Game g;
    for (int i=0; i<3; i++)
    {
        c.getLast();
        c.getFirst();
        g.getGameName();
        r.GetRelDate();
        r.getScore();
        d.getDeveloper();
        c.printLast();
        c.printFirst();
    }
    return 0;
}