3rdparty/boost/boost/fusion/algorithm/transformation/insert.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(FUSION_INSERT_07222005_0730)
   8 #define FUSION_INSERT_07222005_0730
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/fusion/support/detail/as_fusion_element.hpp>
  12 #include <boost/fusion/iterator/mpl/convert_iterator.hpp>
  13 #include <boost/fusion/view/joint_view/joint_view.hpp>
  14 #include <boost/fusion/view/single_view/single_view.hpp>
  15 #include <boost/fusion/view/iterator_range/iterator_range.hpp>
  16 #include <boost/fusion/sequence/intrinsic/begin.hpp>
  17 #include <boost/fusion/sequence/intrinsic/end.hpp>
  18 #include <boost/fusion/adapted/mpl/mpl_iterator.hpp>
  19 #include <boost/fusion/support/is_sequence.hpp>
  20 #include <boost/utility/enable_if.hpp>
  21
  22 namespace boost { namespace fusion
  23 {
  24     namespace result_of
  25     {
  26         template <typename Sequence, typename Position, typename T>
  27         struct insert
  28         {
  29             typedef typename detail::as_fusion_element<T>::type element_type;
  30             typedef typename convert_iterator<Position>::type pos_type;
  31             typedef typename result_of::begin<Sequence>::type first_type;
  32             typedef typename result_of::end<Sequence>::type last_type;
  33
  34             typedef iterator_range<first_type, pos_type> left_type;
  35             typedef iterator_range<pos_type, last_type> right_type;
  36             typedef fusion::single_view<element_type> single_view;
  37             typedef joint_view<left_type, single_view const> left_insert_type;
  38             typedef joint_view<left_insert_type, right_type> type;
  39         };
  40     }
  41
  42     template <typename Sequence, typename Position, typename T>
  43     BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  44     inline typename
  45         lazy_enable_if<
  46             traits::is_sequence<Sequence>
  47           , result_of::insert<Sequence const, Position, T>
  48         >::type
  49     insert(Sequence const& seq, Position const& pos, T const& x)
  50     {
  51         typedef result_of::insert<
  52             Sequence const, Position, T>
  53         result_of;
  54         typedef typename result_of::left_type left_type;
  55         typedef typename result_of::right_type right_type;
  56         typedef typename result_of::single_view single_view;
  57         typedef typename result_of::left_insert_type left_insert_type;
  58         typedef typename result_of::type result;
  59
  60         left_type left(fusion::begin(seq), convert_iterator<Position>::call(pos));
  61         right_type right(convert_iterator<Position>::call(pos), fusion::end(seq));
  62         single_view insert(x);
  63         left_insert_type left_insert(left, insert);
  64         return result(left_insert, right);
  65     }
  66 }}
  67
  68 #endif
  69