126 lines
2.8 KiB
C++
126 lines
2.8 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_HASHED_FACTORY_HPP
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#define BOOST_FLYWEIGHT_HASHED_FACTORY_HPP
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#if defined(_MSC_VER)
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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/flyweight/factory_tag.hpp>
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#include <boost/flyweight/hashed_factory_fwd.hpp>
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#include <boost/multi_index_container.hpp>
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#include <boost/multi_index/identity.hpp>
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#include <boost/multi_index/hashed_index.hpp>
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#include <boost/mpl/aux_/lambda_support.hpp>
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#include <boost/mpl/if.hpp>
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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#include <utility>
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#endif
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/* Flyweight factory based on a hashed container implemented
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* with Boost.MultiIndex.
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*/
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namespace boost{
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namespace flyweights{
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template<
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typename Entry,typename Key,
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typename Hash,typename Pred,typename Allocator
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>
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class hashed_factory_class:public factory_marker
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{
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struct index_list:
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boost::mpl::vector1<
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multi_index::hashed_unique<
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multi_index::identity<Entry>,
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typename boost::mpl::if_<
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mpl::is_na<Hash>,
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hash<Key>,
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Hash
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>::type,
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typename boost::mpl::if_<
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mpl::is_na<Pred>,
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std::equal_to<Key>,
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Pred
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>::type
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>
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>
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{};
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typedef multi_index::multi_index_container<
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Entry,
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index_list,
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typename boost::mpl::if_<
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mpl::is_na<Allocator>,
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std::allocator<Entry>,
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Allocator
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>::type
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> container_type;
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public:
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typedef const Entry* handle_type;
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handle_type insert(const Entry& x)
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{
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return &*cont.insert(x).first;
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}
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#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
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handle_type insert(Entry&& x)
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{
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return &*cont.insert(std::move(x)).first;
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}
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#endif
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void erase(handle_type h)
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{
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cont.erase(cont.iterator_to(*h));
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}
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static const Entry& entry(handle_type h){return *h;}
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private:
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container_type cont;
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public:
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typedef hashed_factory_class type;
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BOOST_MPL_AUX_LAMBDA_SUPPORT(
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5,hashed_factory_class,(Entry,Key,Hash,Pred,Allocator))
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};
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/* hashed_factory_class specifier */
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template<
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typename Hash,typename Pred,typename Allocator
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BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF
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>
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struct hashed_factory:factory_marker
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{
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template<typename Entry,typename Key>
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struct apply:
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mpl::apply2<
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hashed_factory_class<
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boost::mpl::_1,boost::mpl::_2,Hash,Pred,Allocator
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>,
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Entry,Key
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>
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{};
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};
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} /* namespace flyweights */
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} /* namespace boost */
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#endif
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