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  1.  
  2. #ifndef BOOST_MPL_DISTANCE_HPP_INCLUDED
  3. #define BOOST_MPL_DISTANCE_HPP_INCLUDED
  4.  
  5. // Copyright Aleksey Gurtovoy 2000-2004
  6. //
  7. // Distributed under the Boost Software License, Version 1.0.
  8. // (See accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. //
  11. // See http://www.boost.org/libs/mpl for documentation.
  12.  
  13. // $Id$
  14. // $Date$
  15. // $Revision$
  16.  
  17. #include <boost/mpl/distance_fwd.hpp>
  18. #include <boost/mpl/iter_fold.hpp>
  19. #include <boost/mpl/iterator_range.hpp>
  20. #include <boost/mpl/long.hpp>
  21. #include <boost/mpl/next.hpp>
  22. #include <boost/mpl/tag.hpp>
  23. #include <boost/mpl/apply_wrap.hpp>
  24. #include <boost/mpl/aux_/msvc_eti_base.hpp>
  25. #include <boost/mpl/aux_/value_wknd.hpp>
  26. #include <boost/mpl/aux_/na_spec.hpp>
  27. #include <boost/mpl/aux_/config/forwarding.hpp>
  28. #include <boost/mpl/aux_/config/static_constant.hpp>
  29.  
  30.  
  31. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  32.  
  33. // default implementation for forward/bidirectional iterators
  34. template< typename Tag > struct distance_impl
  35. {
  36.     template< typename First, typename Last > struct apply
  37. #if !defined(BOOST_MPL_CFG_NO_NESTED_FORWARDING)
  38.         : aux::msvc_eti_base< typename iter_fold<
  39.               iterator_range<First,Last>
  40.             , mpl::long_<0>
  41.             , next<>
  42.             >::type >
  43.     {
  44. #else
  45.     {
  46.         typedef typename iter_fold<
  47.               iterator_range<First,Last>
  48.             , mpl::long_<0>
  49.             , next<>
  50.             >::type type;
  51.        
  52.         BOOST_STATIC_CONSTANT(long, value =
  53.               (iter_fold<
  54.                   iterator_range<First,Last>
  55.                 , mpl::long_<0>
  56.                 , next<>
  57.                 >::type::value)
  58.             );
  59. #endif
  60.     };
  61. };
  62.  
  63. template<
  64.       typename BOOST_MPL_AUX_NA_PARAM(First)
  65.     , typename BOOST_MPL_AUX_NA_PARAM(Last)
  66.     >
  67. struct distance
  68.     : distance_impl< typename tag<First>::type >
  69.         ::template apply<First, Last>
  70. {
  71.     BOOST_MPL_AUX_LAMBDA_SUPPORT(2, distance, (First, Last))
  72. };
  73.  
  74. BOOST_MPL_AUX_NA_SPEC(2, distance)
  75.  
  76. }}
  77.  
  78. #endif // BOOST_MPL_DISTANCE_HPP_INCLUDED
  79.  
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