#include <cstdlib>
#include <iostream>
#include <boost/container/flat_set.hpp>

using namespace std;

int main(int argc, char *argv[])
{
    int d[2] = {2, 3};
    boost::container::flat_set<int> set;

    set.insert(1);
    set.insert(4);
    set.insert(boost::container::ordered_unique_range_t(), d, d + 2);
    for (int i : set)
        cout << i << endl;

    return EXIT_SUCCESS;
}