Sort string array by alphabet and display values

Question

I am trying to sort an array with is filled with string values by alphabet. It already works with integers. I think the problem isn’t about the sorting, it is about displaying it.

But here is the code:

#include <iostream>
#include <algorithm>
using namespace std;

class Ticket {
    int ticketnr;
    string name;
public:
    Ticket() {
        ticketnr = 0;
        name = "NN";
    };
    Ticket(int _tickernr, string _name) {
        ticketnr = _tickernr;
        name = _name;
    }
    friend bool upSort(Ticket a, Ticket b);
};

bool upSort(Ticket a, Ticket b) {
    return (a.name > b.name);
}
int main() {

    Ticket vip(1435, "Beckenbauer");
    Ticket frei;

    Ticket array[10] = {vip, Ticket(2100, "Maier")};
    sort(array, array + 10, upSort);
    for (int i = 0; i < 10; i++) cout << array[i] << endl;

}

Xcode says: invalid operands to binary expression

Thank you and best regards Flo

You have to provide an overloaded operator << for your class. — Alexandru Barbarosie
– Alexandru Barbarosie, Commented Jul 4, 2013 at 20:30

juanchopanza · Accepted Answer · 2013-07-04 20:29:54Z

4

There is probably nothing wrong with the sort. What is clearly wrong is that you don't have an ostream& operator<< for Ticket, so you cannot do this:

for (int i = 0; i < 10; i++) cout << array[i] << endl;
//                           ^^^^^^^^^^^^^^^^

So,

friend
std::ostream& operator<<(std::ostream& o, const Ticket& t)
{
  return o << t.ticketnr << " " << t.name;
}

answered Jul 4, 2013 at 20:29

juanchopanza

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