C++遍历 vector 并删除匹配的字符串

Question

我正在尝试编写一个字符串列表。用户可以添加到列表或从列表中删除以及显示当前列表。

显示列表和添加到列表工作正常，但我无法弄清楚如何通过遍历列表以找到匹配项来删除用户的字符串。

我该如何更改我的代码来解决这个问题？看看 if(answer == 3)

// InClassAssignment-FavouriteGameList.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <string>
#include <cstdlib>
#include <iostream>
#include <vector>
#include <algorithm>
#include <ctime>
#include <cctype>

using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
    vector <string>  gameList;
    int answer = 0;
    bool cont = true;
    int size = 0;
    vector<string>::iterator iter;
    string addToList;
    string removeFromList;

    cout << "\tGame List" << endl;

    while (cont)
    {
        cout << "--------------------------------------------" << endl;
        cout << "\nWhat do you want to do?";
        cout << "\n1 - Display List";
        cout << "\n2 - Add to List";
        cout << "\n3 - Remove from List";
        cout << "\n4 - End program" << endl << "Selection: ";
        cin >> answer;

        cout << endl;

        if (answer == 1)
        {
            cout << "List: ";
            for (iter = gameList.begin(); iter != gameList.end(); ++iter)
            {
                if (iter != gameList.end() - 1)
                    cout << *iter << ", ";
                else
                    cout << *iter << endl;
            }
        }

        else if (answer == 2)
        {
            cout << "Type in a game to add: ";
            cin >> addToList;
            gameList.push_back(addToList);
            cout << "\nAdded (" << addToList << ") to your list." << endl;
        }

        else if (answer == 3)
        {
            //display list
            cout << "List: ";
            for (iter = gameList.begin(); iter != gameList.end(); ++iter)
            {
                if (iter != gameList.end() - 1)
                    cout << *iter << ", ";
                else
                    cout << *iter << "\n" << endl;
            }

            //ask which one to remove
            cout << "Which game should be removed?: ";
            cin >> removeFromList;

            //loop/iterate through the list to find a match and erase it
            for (iter = gameList.begin(); iter != gameList.end(); ++iter)
            {
                if ()
                    cout << "\nRemoved (" << removeFromList << ")" << endl;
                else
                    cout << "\nGame not found" << endl;
            }

        }

        else
        {
            cont = false;
        }

    }

    cout << "\nThanks for using the program!\n" << endl;

    return 0;
}

Answer 1

您可以使用 std::find 获取匹配您要删除的项目的迭代器，然后调用 vector::erase(iter)

auto iter = std::find(gameList.begin(), gameList.end(), removeFromList);
if (iter != gameList.end())
{
    gameList.erase(iter);
}