| ////////////////////////////////////////////////////////////////////////////// |
| // |
| // (C) Copyright Ion Gaztanaga 2005-2009. 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/interprocess for documentation. |
| // |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef BOOST_INTERPROCESS_MAP_INDEX_HPP |
| #define BOOST_INTERPROCESS_MAP_INDEX_HPP |
| |
| #include <boost/interprocess/detail/config_begin.hpp> |
| #include <boost/interprocess/detail/workaround.hpp> |
| |
| #include <functional> |
| #include <utility> |
| #include <boost/interprocess/containers/map.hpp> |
| #include <boost/interprocess/allocators/private_adaptive_pool.hpp> |
| |
| //!\file |
| //!Describes index adaptor of boost::map container, to use it |
| //!as name/shared memory index |
| |
| namespace boost { |
| namespace interprocess { |
| namespace detail{ |
| |
| //!Helper class to define typedefs from IndexTraits |
| template <class MapConfig> |
| struct map_index_aux |
| { |
| typedef typename MapConfig::key_type key_type; |
| typedef typename MapConfig::mapped_type mapped_type; |
| typedef std::less<key_type> key_less; |
| typedef std::pair<const key_type, mapped_type> value_type; |
| |
| typedef private_adaptive_pool |
| <value_type, |
| typename MapConfig:: |
| segment_manager_base> allocator_type; |
| |
| typedef boost::interprocess::map |
| <key_type, mapped_type, |
| key_less, allocator_type> index_t; |
| }; |
| |
| } //namespace detail { |
| |
| //!Index type based in boost::interprocess::map. Just derives from boost::interprocess::map |
| //!and defines the interface needed by managed memory segments |
| template <class MapConfig> |
| class map_index |
| //Derive class from map specialization |
| : public detail::map_index_aux<MapConfig>::index_t |
| { |
| /// @cond |
| typedef detail::map_index_aux<MapConfig> index_aux; |
| typedef typename index_aux::index_t base_type; |
| typedef typename MapConfig:: |
| segment_manager_base segment_manager_base; |
| /// @endcond |
| |
| public: |
| //!Constructor. Takes a pointer to the |
| //!segment manager. Can throw |
| map_index(segment_manager_base *segment_mngr) |
| : base_type(typename index_aux::key_less(), |
| segment_mngr){} |
| |
| //!This reserves memory to optimize the insertion of n |
| //!elements in the index |
| void reserve(std::size_t) |
| { /*Does nothing, map has not reserve or rehash*/ } |
| |
| //!This tries to free previously allocate |
| //!unused memory. |
| void shrink_to_fit() |
| { base_type::get_stored_allocator().deallocate_free_blocks(); } |
| }; |
| |
| /// @cond |
| |
| //!Trait class to detect if an index is a node |
| //!index. This allows more efficient operations |
| //!when deallocating named objects. |
| template<class MapConfig> |
| struct is_node_index |
| <boost::interprocess::map_index<MapConfig> > |
| { |
| enum { value = true }; |
| }; |
| /// @endcond |
| |
| }} //namespace boost { namespace interprocess { |
| |
| #include <boost/interprocess/detail/config_end.hpp> |
| |
| #endif //#ifndef BOOST_INTERPROCESS_MAP_INDEX_HPP |