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
22namespace 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

source code of include/boost/fusion/algorithm/transformation/insert.hpp