text: 
  #ifndef BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
  #define BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
  
  // Copyright Aleksey Gurtovoy 2001-2004
  //
  // 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/mpl for documentation.
  
  // $Source: /physbam_repository/External_Libraries/Archives/boost/boost/mpl/empty_base.hpp,v $
  // $Date: 2007/02/12 18:25:23 $
  // $Revision: 1.1 $
  
  #include <boost/mpl/bool.hpp>
  #include <boost/mpl/aux_/config/msvc.hpp>
  #include <boost/mpl/aux_/config/workaround.hpp>
  
  #include <boost/type_traits/is_empty.hpp>
  
  // should be always the last #include directive
  #include <boost/type_traits/detail/bool_trait_def.hpp>
  
  namespace boost { namespace mpl {
  
  // empty base class, guaranteed to have no members; inheritance from
  // 'empty_base' through the 'inherit' metafunction is a no-op - see 
  // "mpl/inherit.hpp> header for the details
  struct empty_base {};
  
  template< typename T >
  struct is_empty_base
      : false_
  {
  #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
      using false_::value;
  #endif
  };
  
  template<>
  struct is_empty_base<empty_base>
      : true_
  {
  #if BOOST_WORKAROUND(BOOST_MSVC, < 1300)
      using true_::value;
  #endif
  };
  
  }}
  
  namespace boost {
  BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_empty, mpl::empty_base, true)
  }
  
  #include <boost/type_traits/detail/bool_trait_undef.hpp>
  
  #endif // BOOST_MPL_EMPTY_BASE_HPP_INCLUDED
  