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68 lines
1.8 KiB
68 lines
1.8 KiB
////////////////////////////////////////////////////////////////////////////// |
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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_NULL_INDEX_HPP |
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#define BOOST_INTERPROCESS_NULL_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 <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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/// @cond |
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typedef typename MapConfig:: |
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segment_manager_base segment_manager_base; |
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/// @endcond |
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public: |
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typedef void * iterator; |
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typedef const void * 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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