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77 lines
2.0 KiB
C++
77 lines
2.0 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_NULL_INDEX_HPP
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#define BOOST_INTERPROCESS_NULL_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/interprocess/offset_ptr.hpp>
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//!\file
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//!Describes a null index adaptor, so that if we don't want to construct
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//!named objects, we can use this null index type to save resources.
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namespace boost {
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namespace interprocess {
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//!Null index type
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//!used to save compilation time when
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//!named indexes are not needed.
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template <class MapConfig>
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class null_index
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{
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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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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typedef int * iterator;
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typedef const int * const_iterator;
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//!begin() is equal
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//!to end()
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const_iterator begin() const
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{ return const_iterator(0); }
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//!begin() is equal
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//!to end()
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iterator begin()
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{ return iterator(0); }
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//!begin() is equal
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//!to end()
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const_iterator end() const
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{ return const_iterator(0); }
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//!begin() is equal
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//!to end()
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iterator end()
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{ return iterator(0); }
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//!Empty constructor
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null_index(segment_manager_base *){}
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};
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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_NULL_INDEX_HPP
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