Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: //
Chris@16: // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
Chris@16: // Software License, Version 1.0. (See accompanying file
Chris@16: // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/interprocess for documentation.
Chris@16: //
Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: #ifndef BOOST_INTERPROCESS_NULL_INDEX_HPP
Chris@16: #define BOOST_INTERPROCESS_NULL_INDEX_HPP
Chris@16: 
Chris@16: #include <boost/interprocess/detail/config_begin.hpp>
Chris@16: #include <boost/interprocess/detail/workaround.hpp>
Chris@16: 
Chris@16: #include <boost/interprocess/offset_ptr.hpp>
Chris@16: 
Chris@16: //!\file
Chris@16: //!Describes a null index adaptor, so that if we don't want to construct
Chris@16: //!named objects, we can use this null index type to save resources.
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace interprocess {
Chris@16: 
Chris@16: //!Null index type
Chris@16: //!used to save compilation time when
Chris@16: //!named indexes are not needed.
Chris@16: template <class MapConfig>
Chris@16: class null_index
Chris@16: {
Chris@16:    /// @cond
Chris@16:    typedef typename MapConfig::
Chris@16:       segment_manager_base    segment_manager_base;
Chris@16:    /// @endcond
Chris@16: 
Chris@16:    public:
Chris@16:    typedef void * iterator;
Chris@16:    typedef const void * const_iterator;
Chris@16: 
Chris@16:    //!begin() is equal
Chris@16:    //!to end()
Chris@16:    const_iterator begin() const
Chris@16:    {  return const_iterator(0);  }
Chris@16: 
Chris@16:    //!begin() is equal
Chris@16:    //!to end()
Chris@16:    iterator begin()
Chris@16:    {  return iterator(0);  }
Chris@16: 
Chris@16:    //!begin() is equal
Chris@16:    //!to end()
Chris@16:    const_iterator end() const
Chris@16:    {  return const_iterator(0);  }
Chris@16: 
Chris@16:    //!begin() is equal
Chris@16:    //!to end()
Chris@16:    iterator end()
Chris@16:    {  return iterator(0);  }
Chris@16: 
Chris@16:    //!Empty constructor
Chris@16:    null_index(segment_manager_base *){}
Chris@16: };
Chris@16: 
Chris@16: }}   //namespace boost { namespace interprocess {
Chris@16: 
Chris@16: #include <boost/interprocess/detail/config_end.hpp>
Chris@16: 
Chris@16: #endif   //#ifndef BOOST_INTERPROCESS_NULL_INDEX_HPP