#include <boost/algorithm/string.hpp>
#include <iostream>
#include <list>
#include <string>
#include <iterator>

int main()
{
    std::string s = "one,two,three,four";
    std::list<std::string> results;

    boost::split(results, s, boost::is_any_of(","));
    auto iter = results.begin();
    std::advance(iter, 1);
    std::cout << *iter << "";
}