text: #ifndef  BOOST_SERIALIZATION_ARCHIVE_INPUT_UNORDERED_MAP_HPP
  #define BOOST_SERIALIZATION_ARCHIVE_INPUT_UNORDERED_MAP_HPP
  
  // MS compatible compilers support #pragma once
  #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  # pragma once
  #endif
  
  /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
  // serialization/unordered_map.hpp:
  // serialization for stl unordered_map templates
  
  // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
  // (C) Copyright 2014 Jim Bell
  // Use, modification and distribution is subject to the Boost Software
  // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  
  //  See http://www.boost.org for updates, documentation, and revision history.
  
  #include <boost/config.hpp>
  #include <boost/serialization/nvp.hpp>
  #include <boost/serialization/detail/stack_constructor.hpp>
  #include <boost/serialization/utility.hpp>
  #include <boost/move/utility_core.hpp>
  
  namespace boost {
  namespace serialization {
  namespace stl {
  
  // map input
  template<class Archive, class Container>
  struct archive_input_unordered_map
  {
      inline void operator()(
          Archive &ar,
          Container &s,
          const unsigned int v
      ){
          typedef typename Container::value_type type;
          detail::stack_construct<Archive, type> t(ar, v);
          ar >> boost::serialization::make_nvp("item", t.reference());
          std::pair<typename Container::const_iterator, bool> result =
              s.insert(boost::move(t.reference()));
          // note: the following presumes that the map::value_type was NOT tracked
          // in the archive.  This is the usual case, but here there is no way
          // to determine that.
          if(result.second){
              ar.reset_object_address(
                  & (result.first->second),
                  & t.reference().second
              );
          }
      }
  };
  
  // multimap input
  template<class Archive, class Container>
  struct archive_input_unordered_multimap
  {
      inline void operator()(
          Archive &ar,
          Container &s,
          const unsigned int v
      ){
          typedef typename Container::value_type type;
          detail::stack_construct<Archive, type> t(ar, v);
          ar >> boost::serialization::make_nvp("item", t.reference());
          typename Container::const_iterator result =
              s.insert(t.reference());
          // note: the following presumes that the map::value_type was NOT tracked
          // in the archive.  This is the usual case, but here there is no way
          // to determine that.
          ar.reset_object_address(
              & result->second,
              & t.reference()
          );
      }
  };
  
  } // stl
  } // namespace serialization
  } // namespace boost
  
  #endif // BOOST_SERIALIZATION_ARCHIVE_INPUT_UNORDERED_MAP_HPP
  