C++ Erase-Remove Idiom 无法正常工作？

Question

这篇文章是我昨天帖子的延续：How to output a vector.

所以我正在编写一个简短的程序，它将字符串列表放入一个向量中，将它们导出到一个文件中，在输出它们之前查看它们，最后如果可能的话将它们删除。除了案例 3​​（从列表中删除一本书）之外，我已经设法让所有功能正常工作。我在 Visual Studio 中遇到的错误如下：

1.) “没有重载函数“remove”的实例与参数列表匹配。[LN 76]

2.) “‘移除’：函数不接受 2 个参数”。 [LN 76]

正如您可能知道的那样，我正在尝试按值而不是索引来删除。我仍然在这里学习所以要温柔，但为什么我会得到这些错误？

这是我的完整代码：

#include <iostream>
#include <cctype>
#include <ctype.h>
#include <algorithm>
#include <string>
#include <math.h>
#include <windows.h>
#include <iomanip>
#include <vector>
#include <iostream>
#include <sstream>
#include <fstream>
#include <istream>

// common namespace
using namespace std;

int main()
{

    int option;
    bool iWannaLeave = false;

    vector<string> bookCollection;
    string entryVal = " ";
    int anotherOption;
    do
    {
        cout << "Welcome to MyBook! - A text recorder framework application." << endl;
        cout << "-----------------------------------------------------------" << endl;
        cout << "Main Menu:" << endl;
        cout << "1 - Add a book to the collection." << endl;
        cout << "2 - Display all books currently in the collection." << endl;
        cout << "3 - Remove books from the collection." << endl;
        cout << "4 - Write stored collection to file." << endl;
        cout << "5 - Quit" << endl;
        cout << "Make your selection: ";
        cin >> option;
        cin.ignore();

        switch (option)
        {
        case 1:
        {
            bool wannaMoreBooks = false;
            // the next loop will execute at least one time so you could enter a book
            do
            {
                wannaMoreBooks = false;
                cout << "Add a book title to the collection: ";
                getline(cin, entryVal);
                bookCollection.push_back(entryVal);

                cout << "Would you like to enter another book?(1 - yes, 0 - no): ";

                cin >> anotherOption;
                cin.ignore();
                if (anotherOption == 1) wannaMoreBooks = true;
            } while (wannaMoreBooks == true);
        }
        break;

        case 2:
        {
            for (int i = 0; i < bookCollection.size(); i++)
                cout << bookCollection[i] << " | ";
            cout << endl;
            break;
        }

        case 3: 
        {
            string vecVal;
            cout << "Enter the value you would like to remove: " << endl;
            cin >> vecVal;
            bookCollection.erase(remove(bookCollection.begin(), vecVal), bookCollection.end());
        }
            // remove a book from the collection
            break;

        case 4:
        {
            ofstream fileOut("Collection.txt");
            fileOut << "Your MyBook Collection: [Begin] - | ";
            auto first = true;
            for (string x : bookCollection)
            {
                if (!first) { fileOut << " | "; }
                first = false;
                fileOut << x;
            }
            fileOut << " | - [End]" << endl;
            cout << "Collection.txt has been successfully written." << endl;
            break;
        }
        case 5:
        {
            //Nested IF to kill program properly
            int quitVar;
            cout << "Are you sure you want to exit the program?: ";

            cin >> quitVar;
            cin.ignore();

            if (quitVar == 1)
            {
                cout << "The program will now be terminated." << endl;
                iWannaLeave = true;
            }
            else if (quitVar == 0)  cout << "Returning to the main menu." << endl;
        }
        break;
        }
    } while (iWannaLeave == false);

    return 0;
}

我知道这不是近乎完美的代码，所以除了找出我收到这些错误的原因之外，我还希望对我如何改进提出一些建设性的批评。

另外：如果我想在头文件中使用函数而不是开关，我是否只需将案例内容移动到头文件中？

提前致谢！ :)

Answer 1

几乎所有 STL 函数都采用一个或多个 对 迭代器。由于您只是通过begin，因此没有可行的过载。你需要打电话

remove(bookCollection.begin(), bookCollection.end(), vecVal)

检查reference 总是一个好主意，它通常还包含一个基本用法示例。