| /* Copyright 2006-2009 Joaquin M Lopez Munoz. |
| * Distributed under 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/libs/flyweight for library home page. |
| */ |
| |
| #ifndef BOOST_FLYWEIGHT_HASHED_FACTORY_HPP |
| #define BOOST_FLYWEIGHT_HASHED_FACTORY_HPP |
| |
| #if defined(_MSC_VER)&&(_MSC_VER>=1200) |
| #pragma once |
| #endif |
| |
| #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
| #include <boost/flyweight/factory_tag.hpp> |
| #include <boost/flyweight/hashed_factory_fwd.hpp> |
| #include <boost/multi_index_container.hpp> |
| #include <boost/multi_index/identity.hpp> |
| #include <boost/multi_index/hashed_index.hpp> |
| #include <boost/mpl/aux_/lambda_support.hpp> |
| #include <boost/mpl/if.hpp> |
| |
| /* Flyweight factory based on a hashed container implemented |
| * with Boost.MultiIndex. |
| */ |
| |
| namespace boost{ |
| |
| namespace flyweights{ |
| |
| template< |
| typename Entry,typename Key, |
| typename Hash,typename Pred,typename Allocator |
| > |
| class hashed_factory_class:public factory_marker |
| { |
| struct index_list: |
| boost::mpl::vector1< |
| multi_index::hashed_unique< |
| multi_index::identity<Entry>, |
| typename boost::mpl::if_< |
| mpl::is_na<Hash>, |
| hash<Key>, |
| Hash |
| >::type, |
| typename boost::mpl::if_< |
| mpl::is_na<Pred>, |
| std::equal_to<Key>, |
| Pred |
| >::type |
| > |
| > |
| {}; |
| |
| typedef multi_index::multi_index_container< |
| Entry, |
| index_list, |
| typename boost::mpl::if_< |
| mpl::is_na<Allocator>, |
| std::allocator<Entry>, |
| Allocator |
| >::type |
| > container_type; |
| |
| public: |
| typedef const Entry* handle_type; |
| |
| handle_type insert(const Entry& x) |
| { |
| return &*cont.insert(x).first; |
| } |
| |
| void erase(handle_type h) |
| { |
| cont.erase(cont.iterator_to(*h)); |
| } |
| |
| static const Entry& entry(handle_type h){return *h;} |
| |
| private: |
| container_type cont; |
| |
| public: |
| typedef hashed_factory_class type; |
| BOOST_MPL_AUX_LAMBDA_SUPPORT( |
| 5,hashed_factory_class,(Entry,Key,Hash,Pred,Allocator)) |
| }; |
| |
| /* hashed_factory_class specifier */ |
| |
| template< |
| typename Hash,typename Pred,typename Allocator |
| BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF |
| > |
| struct hashed_factory:factory_marker |
| { |
| template<typename Entry,typename Key> |
| struct apply: |
| mpl::apply2< |
| hashed_factory_class< |
| boost::mpl::_1,boost::mpl::_2,Hash,Pred,Allocator |
| >, |
| Entry,Key |
| > |
| {}; |
| }; |
| |
| } /* namespace flyweights */ |
| |
| } /* namespace boost */ |
| |
| #endif |