#include <boost/multi_index_container.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/member.hpp>
#include <utility>
#include <string>

namespace mi=boost::multi_index;

typedef int some_type;

typedef std::pair<std::string, some_type const*> key_value_pair;

struct hash{}; //tag used to retrieve values

typedef mi::multi_index_container
<
  key_value_pair,
  mi::indexed_by
  <
    mi::hashed_unique
    <
      mi::tag<hash>,
      BOOST_MULTI_INDEX_MEMBER(key_value_pair, std::string, first)
    >
  >
> types_map;


types_map types_;

inline void create_type(std::string const& name)
{
  types_map::index<hash>::type::const_iterator i=types_.get<hash>().find(name);
}

int main()
{
  create_type("hello");
}