110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_INTERPROCESS_MAP_INDEX_HPP
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#define BOOST_INTERPROCESS_MAP_INDEX_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <boost/intrusive/detail/minimal_pair_header.hpp>
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#include <boost/interprocess/containers/map.hpp>
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#include <boost/interprocess/allocators/private_adaptive_pool.hpp>
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#include <boost/intrusive/detail/minimal_pair_header.hpp> //std::pair
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#include <boost/intrusive/detail/minimal_less_equal_header.hpp> //std::less
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//!\file
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//!Describes index adaptor of boost::map container, to use it
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//!as name/shared memory index
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namespace boost {
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namespace interprocess {
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namespace ipcdetail{
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//!Helper class to define typedefs from IndexTraits
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template <class MapConfig>
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struct map_index_aux
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{
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typedef typename MapConfig::key_type key_type;
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typedef typename MapConfig::mapped_type mapped_type;
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typedef std::less<key_type> key_less;
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typedef std::pair<const key_type, mapped_type> value_type;
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typedef private_adaptive_pool
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<value_type,
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typename MapConfig::
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segment_manager_base> allocator_type;
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typedef boost::interprocess::map
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<key_type, mapped_type,
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key_less, allocator_type> index_t;
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};
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} //namespace ipcdetail {
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//!Index type based in boost::interprocess::map. Just derives from boost::interprocess::map
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//!and defines the interface needed by managed memory segments
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template <class MapConfig>
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class map_index
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//Derive class from map specialization
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: public ipcdetail::map_index_aux<MapConfig>::index_t
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{
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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typedef ipcdetail::map_index_aux<MapConfig> index_aux;
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typedef typename index_aux::index_t base_type;
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typedef typename MapConfig::
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segment_manager_base segment_manager_base;
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public:
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//!Constructor. Takes a pointer to the
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//!segment manager. Can throw
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map_index(segment_manager_base *segment_mngr)
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: base_type(typename index_aux::key_less(),
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segment_mngr){}
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//!This reserves memory to optimize the insertion of n
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//!elements in the index
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void reserve(typename segment_manager_base::size_type)
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{ /*Does nothing, map has not reserve or rehash*/ }
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//!This tries to free previously allocate
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//!unused memory.
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void shrink_to_fit()
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{ base_type::get_stored_allocator().deallocate_free_blocks(); }
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};
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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//!Trait class to detect if an index is a node
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//!index. This allows more efficient operations
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//!when deallocating named objects.
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template<class MapConfig>
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struct is_node_index
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<boost::interprocess::map_index<MapConfig> >
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{
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static const bool value = true;
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};
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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}} //namespace boost { namespace interprocess {
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#include <boost/interprocess/detail/config_end.hpp>
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#endif //#ifndef BOOST_INTERPROCESS_MAP_INDEX_HPP
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