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  1.  
  2. #ifndef BOOST_MPL_ADVANCE_HPP_INCLUDED
  3. #define BOOST_MPL_ADVANCE_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/advance_fwd.hpp>
  18. #include <boost/mpl/less.hpp>
  19. #include <boost/mpl/negate.hpp>
  20. #include <boost/mpl/long.hpp>
  21. #include <boost/mpl/if.hpp>
  22. #include <boost/mpl/tag.hpp>
  23. #include <boost/mpl/apply_wrap.hpp>
  24. #include <boost/mpl/aux_/advance_forward.hpp>
  25. #include <boost/mpl/aux_/advance_backward.hpp>
  26. #include <boost/mpl/aux_/value_wknd.hpp>
  27. #include <boost/mpl/aux_/na_spec.hpp>
  28. #include <boost/mpl/aux_/nttp_decl.hpp>
  29.  
  30. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  31.  
  32. // default implementation for forward/bidirectional iterators
  33. template< typename Tag >
  34. struct advance_impl
  35. {
  36.     template< typename Iterator, typename N > struct apply
  37.     {
  38.         typedef typename less< N,long_<0> >::type backward_;
  39.         typedef typename if_< backward_, negate<N>, N >::type offset_;
  40.  
  41.         typedef typename if_<
  42.               backward_
  43.             , aux::advance_backward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value >
  44.             , aux::advance_forward< BOOST_MPL_AUX_VALUE_WKND(offset_)::value >
  45.             >::type f_;
  46.  
  47.         typedef typename apply_wrap1<f_,Iterator>::type type;
  48.     };
  49. };
  50.  
  51.  
  52. template<
  53.       typename BOOST_MPL_AUX_NA_PARAM(Iterator)
  54.     , typename BOOST_MPL_AUX_NA_PARAM(N)
  55.     >
  56. struct advance
  57.     : advance_impl< typename tag<Iterator>::type >
  58.         ::template apply<Iterator,N>
  59. {
  60. };
  61.  
  62. template<
  63.       typename Iterator
  64.     , BOOST_MPL_AUX_NTTP_DECL(long, N)
  65.     >
  66. struct advance_c
  67.     : advance_impl< typename tag<Iterator>::type >
  68.         ::template apply<Iterator,long_<N> >
  69. {
  70. };
  71.  
  72. BOOST_MPL_AUX_NA_SPEC(2, advance)
  73.  
  74. }}
  75.  
  76. #endif // BOOST_MPL_ADVANCE_HPP_INCLUDED
  77.  
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