Question

标题

#ifndef BBOARD_H
#define BBOARD_H

#include <iostream>
#include <string>
#include <vector>
using namespace std;
class User{
};
class Message{
};
class BBoard{
private:
    string title;
    vector<User> user_list;
    User current_user;
    vector<Message> message_list;
public:
    BBoard();
    BBoard(const string &ttl);
    void setup(const string &input_file);
    void login();
    void run();
private:
    bool user_exists(const string &name, const string &pass) const;
};

#endif

.cpp文件

#include "BBoard.h"
#include <fstream>
#include <algorithm>
using namespace std;

User user_l;
BBoard::BBoard(){
    title = "Hello World";
    vector<User> user_list;
    User current_user;
    vector<Message> message_list;
}

BBoard::BBoard(const string &ttl){
    title = ttl;
}

void BBoard::setup(const string &input_file){
    ifstream fin;
    fin.open("users1.txt");
    while(!fin.eof()){
        user_list.push_back(user_l);
    }
}

bool BBoard::user_exists(const string &name, const string &pass) const{
    vector<User>::iterator i = find(user_list.begin(), user_list.end(), name);
}

void BBoard::login(){
    string sn, pw;
    cout << "Welcome to " << title << endl;
    bookmark:
    cout << "Enter our username ('Q' or 'q' to quit): ";
    getline(cin, sn);
    cout << "Enter your password: ('Q' or 'q' to quit): ";
    getline(cin, pw);

}

我的user_exists函数不断给出关于没有合适的用户定义转换的错误。我试图使用user_exists来检查用户名和密码，如果它存在，它将返回true。

Answer 1

您的user_exists函数为bool，但不返回任何值。这是一个建议：

bool BBoard::user_exists(const string &name, const string &pass) const{
    vector<User>::const_iterator i = find(user_list.begin(), user_list.end(), name);
    return !(i == user_list.end());
}

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