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  1.  
  2. #ifndef BOOST_MPL_INSERT_IMPL_HPP_INCLUDED
  3. #define BOOST_MPL_INSERT_IMPL_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/reverse_fold.hpp>
  18. #include <boost/mpl/iterator_range.hpp>
  19. #include <boost/mpl/clear.hpp>
  20. #include <boost/mpl/push_front.hpp>
  21. #include <boost/mpl/aux_/na_spec.hpp>
  22. #include <boost/mpl/aux_/traits_lambda_spec.hpp>
  23. #include <boost/type_traits/is_same.hpp>
  24.  
  25. namespace mars_boost {} namespace boost = mars_boost; namespace mars_boost { namespace mpl {
  26.  
  27. // default implementation; conrete sequences might override it by
  28. // specializing either the 'insert_impl' or the primary 'insert' template
  29.  
  30. template< typename Tag >
  31. struct insert_impl
  32. {
  33.     template<
  34.           typename Sequence
  35.         , typename Pos
  36.         , typename T
  37.         >
  38.     struct apply
  39.     {
  40.         typedef iterator_range<
  41.               typename begin<Sequence>::type
  42.             , Pos
  43.             > first_half_;
  44.  
  45.         typedef iterator_range<
  46.               Pos
  47.             , typename end<Sequence>::type
  48.             > second_half_;
  49.  
  50.         typedef typename reverse_fold<
  51.               second_half_
  52.             , typename clear<Sequence>::type
  53.             , push_front<_,_>
  54.             >::type half_sequence_;
  55.  
  56.         typedef typename reverse_fold<
  57.               first_half_
  58.             , typename push_front<half_sequence_,T>::type
  59.             , push_front<_,_>
  60.             >::type type;
  61.     };
  62. };
  63.  
  64. BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(3,insert_impl)
  65.  
  66. }}
  67.  
  68. #endif // BOOST_MPL_INSERT_IMPL_HPP_INCLUDED
  69.  
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