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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2005-2012. 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
#if defined(_MSC_VER)
# pragma once
#endif
#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 ipcdetail{
//!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 ipcdetail {
//!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 ipcdetail::map_index_aux<MapConfig>::index_t
{
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
typedef ipcdetail::map_index_aux<MapConfig> index_aux;
typedef typename index_aux::index_t base_type;
typedef typename MapConfig::
segment_manager_base segment_manager_base;
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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(typename segment_manager_base::size_type)
{ /*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(); }
};
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
//!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> >
{
static const bool value = true;
};
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
}} //namespace boost { namespace interprocess {
#include <boost/interprocess/detail/config_end.hpp>
#endif //#ifndef BOOST_INTERPROCESS_MAP_INDEX_HPP
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