Chris@101: /* Copyright 2006-2014 Joaquin M Lopez Munoz.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  * (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  * http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  *
Chris@16:  * See http://www.boost.org/libs/flyweight for library home page.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP
Chris@16: #define BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP
Chris@16: 
Chris@101: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
Chris@16: #include <boost/flyweight/assoc_container_factory_fwd.hpp>
Chris@16: #include <boost/flyweight/detail/is_placeholder_expr.hpp>
Chris@16: #include <boost/flyweight/detail/nested_xxx_if_not_ph.hpp>
Chris@16: #include <boost/flyweight/factory_tag.hpp>
Chris@16: #include <boost/mpl/apply.hpp>
Chris@16: #include <boost/mpl/aux_/lambda_support.hpp>
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: 
Chris@101: #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
Chris@101: #include <utility>
Chris@101: #endif
Chris@101: 
Chris@16: namespace boost{namespace flyweights{namespace detail{
Chris@16: BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(iterator);
Chris@16: BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(value_type);
Chris@16: }}} /* namespace boost::flyweights::detail */
Chris@16: 
Chris@16: /* Factory class using a given associative container.
Chris@16:  */
Chris@16: 
Chris@16: namespace boost{
Chris@16: 
Chris@16: namespace flyweights{
Chris@16: 
Chris@16: template<typename Container>
Chris@16: class assoc_container_factory_class:public factory_marker
Chris@16: {
Chris@16: public:
Chris@16:   /* When assoc_container_factory_class<Container> is an MPL placeholder
Chris@16:    * expression, referring to Container::iterator and Container::value_type
Chris@16:    * force the MPL placeholder expression Container to be instantiated, which
Chris@16:    * is wasteful and can fail in concept-checked STL implementations.
Chris@16:    * We protect ourselves against this circumstance.
Chris@16:    */
Chris@16: 
Chris@16:   typedef typename detail::nested_iterator_if_not_placeholder_expression<
Chris@16:     Container
Chris@16:   >::type                                handle_type;
Chris@16:   typedef typename detail::nested_value_type_if_not_placeholder_expression<
Chris@16:     Container
Chris@16:   >::type                                entry_type;
Chris@16:   
Chris@16:   handle_type insert(const entry_type& x)
Chris@16:   {
Chris@16:     return cont.insert(x).first;
Chris@16:   }
Chris@16: 
Chris@101: #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
Chris@101:   handle_type insert(entry_type&& x)
Chris@101:   {
Chris@101:     return cont.insert(std::move(x)).first;
Chris@101:   }
Chris@101: #endif
Chris@101: 
Chris@16:   void erase(handle_type h)
Chris@16:   {
Chris@16:     cont.erase(h);
Chris@16:   }
Chris@16: 
Chris@16:   static const entry_type& entry(handle_type h){return *h;}
Chris@16: 
Chris@16: private:
Chris@16:   /* As above, avoid instantiating Container if it is an
Chris@16:    * MPL placeholder expression.
Chris@16:    */
Chris@16: 
Chris@16:   typedef typename mpl::if_<
Chris@16:     detail::is_placeholder_expression<Container>,
Chris@16:     int,
Chris@16:     Container
Chris@16:   >::type container_type;
Chris@16:   container_type cont;
Chris@16: 
Chris@16: public:
Chris@16:   typedef assoc_container_factory_class type;
Chris@16:   BOOST_MPL_AUX_LAMBDA_SUPPORT(1,assoc_container_factory_class,(Container))
Chris@16: };
Chris@16: 
Chris@16: /* assoc_container_factory_class specifier */
Chris@16: 
Chris@16: template<
Chris@16:   typename ContainerSpecifier
Chris@16:   BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF
Chris@16: >
Chris@16: struct assoc_container_factory:factory_marker
Chris@16: {
Chris@16:   template<typename Entry,typename Key>
Chris@16:   struct apply
Chris@16:   {
Chris@16:     typedef assoc_container_factory_class<
Chris@16:       typename mpl::apply2<ContainerSpecifier,Entry,Key>::type
Chris@16:     > type;
Chris@16:   };
Chris@16: };
Chris@16: 
Chris@16: }  /* namespace flyweights */
Chris@16: 
Chris@16: } /* namespace boost */
Chris@16: 
Chris@16: #endif