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 | |
70 | |