WB4.9 Перегрузка операторов ввода и вывода

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <iomanip>
#include <sstream>

using namespace std;

struct Duration
{
    Duration(int h = 0, int m = 0)
    {
        hour = h;
        min = m;
    }

    int hour;
    int min;
};

Duration ReadDuraton(istream& stream)
{
    int h = 0;
    int m = 0;

    stream >> h;
    stream.ignore(1);

    stream >> m;
    stream.ignore(1);

    return Duration{ h,m };
}

void PrintDuration(ostream& stream, const Duration& duration)
{
    stream << setfill('0');
    stream << setw(2) << duration.hour << ':' << setw(2) << duration.min;
}

ostream& operator<<(ostream& stream, const Duration& duration)
{
    stream << setfill('0');
    stream << setw(2) << duration.hour << ':' << setw(2) << duration.min;

    return stream;
}

istream& operator >> (istream& stream, Duration& duration)
{
    stream >> duration.hour;
    stream.ignore(1);

    stream >> duration.min;
    stream.ignore(1);

    return stream;
}

int main()
{
    stringstream dur_ss("02:50");
    /*Duration dur1 = ReadDuraton(dur_ss);*/
    /*PrintDuration(cout, dur1);
    operator << (operator << (cout, "hello"), " world");
    cout << dur1 << endl;*/

    //Duration dur1{ 0,0 };
    Duration dur1;

    dur_ss >> dur1;

    cout << dur1 << endl;

    return 0;
}