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