#include <iostream>
#include <unordered_map>
#include <boost/utility/string_view.hpp>
#include <boost/functional/hash.hpp>

using namespace std;

// custom specialization of boost::hash
namespace boost
{
    template<>
    struct hash<boost::string_view>
    {
      std::size_t operator()(boost::string_view str) const
      {
        return boost::hash_range<const char*>(str.begin(), str.end());
      }
    };
}

int main() {
  std::vector<std::string> v(3);
  v[0] = "jeffin";
  v[1] = "sam";
  v[2] = "good";
  boost::string_view strview;
  std::vector<std::string> temp;
  std::unordered_map<boost::string_view, std::size_t, boost::hash<boost::string_view>> m;
  for (auto& str :v)
  {
    strview = str;
    temp.push_back(std::string(strview));
    std::cout<<"I will insert a pointer pointing to "<<&temp[temp.size()-1]<<std::endl;

    m[temp[temp.size()-1]]=1;
    for(auto &i : temp)
    {
      std::cout<<i<<" "<<&i<<std::endl;
    }
    std::cout<<std::endl;
    for (auto& elem : m)
      std::cout << elem.first << ":" << elem.second << std::endl;
  }
  std::cout<<"printing using index "<<temp[2]<<" and now address "<<&temp[2]<<std::endl;
  v.clear();
  return 0;
}