Перегрузка оператора ввода для структуры

 cout << str.at(i).marka;

#include "pch.h"
#include <iostream>
#include <fstream>
#include <iterator>
#include <string>
#include <list>
#include <vector>
using namespace std;
struct Phone
{
    string marka;
    string model;
    string color;
    string price;
};
 
std::ostream & operator<<(std::ostream & out, const Phone & phone)
{
    return out << phone.marka << ' ' << phone.model << ' ' << phone.color << ' ' << phone.price;
}
 
int main()
{
 
    //vector <string> strVector(10);
    vector <Phone> str;
    //std::list<int>::const_iterator it;
    ifstream RF("Read.txt", ios::in);
    int q = 0;
    if (RF) {
        while (!RF.eof()) {
            string y;
            RF >> y;
            Phone t = { y,y,y,y };
            str.push_back(t);
        }
    }
    for (int i = 0; i < str.size(); ++i)
    {
        
        cout << str.at(i).marka;
 
    }

#include "pch.h"
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
 
using namespace std;
struct Phone
{
    string marka;
    string model;
    string color;
    string price;
};
 
std::ostream& operator << (std::ostream& out, const Phone& phone)
{
    return out << phone.marka << ' ' << phone.model << ' ' << phone.color << ' ' << phone.price;
}
 
std::istream& operator >> (std::istream& in, Phone& phone)
{
    return in >> phone.marka >> phone.model >> phone.color >> phone.price;
}
 
int main()
{
    vector <Phone> db;
    ifstream RF("Read.txt", ios::in);
    if (RF)
        while (!RF.eof())
            db.emplace_back(),
            RF >> db.back();
 
    for (size_t i = 0, e = db.size(); i != e; ++i)
        cout << db[i].marka;
}