Chris@102: /* Copyright 2006-2014 Joaquin M Lopez Munoz.
Chris@102:  * Distributed under the Boost Software License, Version 1.0.
Chris@102:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@102:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@102:  *
Chris@102:  * See http://www.boost.org/libs/flyweight for library home page.
Chris@102:  */
Chris@102: 
Chris@102: #ifndef BOOST_FLYWEIGHT_DETAIL_SERIALIZATION_HELPER_HPP
Chris@102: #define BOOST_FLYWEIGHT_DETAIL_SERIALIZATION_HELPER_HPP
Chris@102: 
Chris@102: #if defined(_MSC_VER)&&(_MSC_VER>=1200)
Chris@102: #pragma once
Chris@102: #endif
Chris@102: 
Chris@102: #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
Chris@102: #include <boost/multi_index_container.hpp>
Chris@102: #include <boost/multi_index/hashed_index.hpp>
Chris@102: #include <boost/multi_index/random_access_index.hpp>
Chris@102: #include <boost/noncopyable.hpp>
Chris@102: #include <boost/serialization/extended_type_info.hpp>
Chris@102: #include <vector>
Chris@102: 
Chris@102: namespace boost{
Chris@102: 
Chris@102: namespace flyweights{
Chris@102: 
Chris@102: namespace detail{
Chris@102: 
Chris@102: /* The serialization helpers for flyweight<T> map numerical IDs to
Chris@102:  * flyweight exemplars --an exemplar is the flyweight object
Chris@102:  * associated to a given value that appears first on the serialization
Chris@102:  * stream, so that subsequent equivalent flyweight objects will be made
Chris@102:  * to refer to it during the serialization process.
Chris@102:  */
Chris@102: 
Chris@102: template<typename Flyweight>
Chris@102: struct flyweight_value_address
Chris@102: {
Chris@102:   typedef const typename Flyweight::value_type* result_type;
Chris@102: 
Chris@102:   result_type operator()(const Flyweight& x)const{return &x.get();}
Chris@102: };
Chris@102: 
Chris@102: template<typename Flyweight>
Chris@102: class save_helper:private noncopyable
Chris@102: {
Chris@102:   typedef multi_index::multi_index_container<
Chris@102:     Flyweight,
Chris@102:     multi_index::indexed_by<
Chris@102:       multi_index::random_access<>,
Chris@102:       multi_index::hashed_unique<flyweight_value_address<Flyweight> >
Chris@102:     >
Chris@102:   > table;
Chris@102: 
Chris@102: public:
Chris@102: 
Chris@102:   typedef typename table::size_type size_type;
Chris@102: 
Chris@102:   size_type size()const{return t.size();}
Chris@102: 
Chris@102:   size_type find(const Flyweight& x)const
Chris@102:   {
Chris@102:     return multi_index::project<0>(t,multi_index::get<1>(t).find(&x.get()))
Chris@102:              -t.begin();
Chris@102:   }
Chris@102: 
Chris@102:   void push_back(const Flyweight& x){t.push_back(x);}
Chris@102:   
Chris@102: private:
Chris@102:   table t;
Chris@102: };
Chris@102: 
Chris@102: template<typename Flyweight>
Chris@102: class load_helper:private noncopyable
Chris@102: {
Chris@102:   typedef std::vector<Flyweight> table;
Chris@102: 
Chris@102: public:
Chris@102: 
Chris@102:   typedef typename table::size_type size_type;
Chris@102: 
Chris@102:   size_type size()const{return t.size();}
Chris@102: 
Chris@102:   Flyweight operator[](size_type n)const{return t[n];}
Chris@102: 
Chris@102:   void push_back(const Flyweight& x){t.push_back(x);}
Chris@102:   
Chris@102: private:
Chris@102:   table t;
Chris@102: };
Chris@102: 
Chris@102: } /* namespace flyweights::detail */
Chris@102: 
Chris@102: } /* namespace flyweights */
Chris@102: 
Chris@102: } /* namespace boost */
Chris@102: 
Chris@102: #endif