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