114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2009. 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_UNORDERED_MAP_INDEX_HPP
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#define BOOST_INTERPROCESS_UNORDERED_MAP_INDEX_HPP
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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 <functional>
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#include <utility>
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#include <boost/unordered_map.hpp>
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#include <boost/interprocess/detail/utilities.hpp>
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#include <boost/interprocess/allocators/private_adaptive_pool.hpp>
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//!\file
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//!Describes index adaptor of boost::unordered_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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///@cond
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//!Helper class to define typedefs from
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//!IndexTraits
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template <class MapConfig>
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struct unordered_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::equal_to<key_type> key_equal;
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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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struct hasher
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: std::unary_function<key_type, std::size_t>
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{
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std::size_t operator()(const key_type &val) const
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{
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typedef typename key_type::char_type char_type;
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const char_type *beg = ipcdetail::get_pointer(val.mp_str),
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*end = beg + val.m_len;
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return boost::hash_range(beg, end);
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}
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};
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typedef unordered_map<key_type, mapped_type, hasher,
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key_equal, allocator_type> index_t;
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};
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///@endcond
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//!Index type based in unordered_map. Just derives from unordered_map and
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//!defines the interface needed by managed memory segments
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template <class MapConfig>
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class unordered_map_index
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//Derive class from unordered_map specialization
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: public unordered_map_index_aux<MapConfig>::index_t
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{
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/// @cond
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typedef unordered_map_index_aux<MapConfig> index_aux;
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typedef typename index_aux::index_t base_type;
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typedef typename
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MapConfig::segment_manager_base segment_manager_base;
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/// @endcond
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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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unordered_map_index(segment_manager_base *segment_mngr)
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: base_type(0,
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typename index_aux::hasher(),
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typename index_aux::key_equal(),
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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 n)
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{ base_type::rehash(n); }
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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::rehash(base_type::size()); }
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};
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/// @cond
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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::unordered_map_index<MapConfig> >
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{
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enum { value = true };
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};
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/// @endcond
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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_UNORDERED_MAP_INDEX_HPP
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