/* Copyright 2006-2015 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_ASSOC_CONTAINER_FACTORY_HPP
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#define BOOST_FLYWEIGHT_ASSOC_CONTAINER_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/assoc_container_factory_fwd.hpp>
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#include <boost/flyweight/detail/is_placeholder_expr.hpp>
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#include <boost/flyweight/detail/nested_xxx_if_not_ph.hpp>
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#include <boost/flyweight/factory_tag.hpp>
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#include <boost/mpl/apply.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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namespace boost{namespace flyweights{namespace detail{
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BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(iterator)
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BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(value_type)
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}}} /* namespace boost::flyweights::detail */
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/* Factory class using a given associative container.
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*/
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namespace boost{
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namespace flyweights{
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template<typename Container>
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class assoc_container_factory_class:public factory_marker
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{
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public:
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/* When assoc_container_factory_class<Container> is an MPL placeholder
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* expression, referring to Container::iterator and Container::value_type
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* force the MPL placeholder expression Container to be instantiated, which
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* is wasteful and can fail in concept-checked STL implementations.
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* We protect ourselves against this circumstance.
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*/
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typedef typename detail::nested_iterator_if_not_placeholder_expression<
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Container
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>::type handle_type;
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typedef typename detail::nested_value_type_if_not_placeholder_expression<
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Container
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>::type entry_type;
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handle_type insert(const entry_type& 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_type&& 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(h);
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}
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static const entry_type& entry(handle_type h){return *h;}
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private:
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/* As above, avoid instantiating Container if it is an
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* MPL placeholder expression.
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*/
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typedef typename mpl::if_<
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detail::is_placeholder_expression<Container>,
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int,
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Container
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>::type container_type;
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container_type cont;
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public:
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typedef assoc_container_factory_class type;
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BOOST_MPL_AUX_LAMBDA_SUPPORT(1,assoc_container_factory_class,(Container))
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};
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/* assoc_container_factory_class specifier */
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template<
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typename ContainerSpecifier
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BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF
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>
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struct assoc_container_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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{
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typedef assoc_container_factory_class<
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typename mpl::apply2<ContainerSpecifier,Entry,Key>::type
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> type;
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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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