ListSortClasses

#include <iostream>
#include <fstream>
#include <string>
#include <list>
using namespace std;

class BookFair {
public:
    string NameBook;
    string Author;
    double Price;
    BookFair() {
        NameBook = Author = Price = 0;
    }

    BookFair(string NameBook, string Author, double Price) {
        this->NameBook = NameBook;
        this->Author = Author;
        this->Price = Price;
    }

    void Print() {
        cout << "NameBook: " << NameBook << "\tAuthor: " << Author << "\tPrice: " << Price << endl;
    }
};

static void SortByNameBook(list<BookFair> &list) {
    list.sort([](BookFair& l1, BookFair& l2) { return l1.NameBook < l2.NameBook; });
}
static void SortByAuthor(list<BookFair> &list) {
    list.sort([](BookFair& l1, BookFair& l2) { return l1.Author < l2.Author; });
}
static void SortByPrice(list<BookFair> &list) {
    list.sort([](BookFair& l1, BookFair& l2) { return l1.Price < l2.Price; });
}


int main() {
    string path = "text.txt";
    BookFair bf("a", "3", 3);
   // bf.Print();

   /* ofstream fout;
    fout.open(path, ofstream::app);

    if (!fout.is_open())
    {
        cout << "Error open!" << endl;
    }
    else {
        fout.write((char*)&bf, sizeof(BookFair));
    }
    fout.close();*/
    list<BookFair> l;

    ifstream fin;
    fin.open(path);

    if (!fin.is_open())
    {
        cout << "Error open!" << endl;
    }
    else {
        BookFair b;

        while (fin.read((char*)&b, sizeof(BookFair)))
        {
           // b.Print();
            l.push_back(b);

        }
        for (auto i : l)
            cout << i.NameBook << "\t" << i.Author << "\t" << i.Price << "\t" << endl;
        SortByNameBook(l);
        cout << endl;
        for (auto i : l)
            cout << i.NameBook << "\t" << i.Author << "\t" << i.Price << "\t" << endl;

    }
    fin.close();
}