split_csv2.cpp

void split_csv(std::string raw_csv, std::set<std::string>& dest_set)
{
     std::vector<boost::iterator_range<std::string::iterator>> result;
     boost::algorithm::split(result, raw_csv, [](char c)
     {
        return c == ',';
     });

     boost::transform(result, std::inserter(dest_set, dest_set.begin()), 
        [](boost::iterator_range<std::string::iterator> r)
        {
            auto begin = r.begin();
            auto end = r.end();
            
            while(begin != end && std::isspace(*begin))
                ++begin;

            while(begin != end && std::isspace(*(end - 1)))
                --end;

            return std::string(begin, end);
        }
     );

     dest_set.erase("");
}