Kind of sort two products in C++

sortish.cc

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
#include <utility>
#include <string>

using namespace std;

typedef pair<string,int> product;

class sorter : binary_function<product,product,bool> {
    public:
        result_type operator()(first_argument_type v1, second_argument_type v2) {
            return v2.second > v1.second;
        }
};

int main() {
    product p1 = make_pair(string("Foo"), 10);
    product p2 = make_pair(string("Fool"), 5);
    vector<product> products = vector<product>(2);
    products[0] = p1;
    products[1] = p2;
    sort(products.begin(), products.end(), sorter());
    sorter s = sorter();
    cout << "Hello ";
    cout << products[0].first;
    cout << s(p2, p1);
    cout << endl;
}