2.2.11.1 Sets - swapping

#include <iostream>
#include <fstream>
#include <set>
#include <functional>

using namespace std;

int main() {

    set <double, greater<double >> valuesA = { -1.1, 2.9, -2.3, 3.7 };
    set <double ,greater<double >> valuesB = { -3.14, 2.71, -3.88, 2.19 };

    valuesA.swap(valuesB);

    for (auto value : valuesA)
        cout << value << " ";
    cout << endl;
    for (auto value : valuesB)
        cout << value << " ";
    cout << endl;

    return 0;
}