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_NEXT_IMPL_07162005_0136)
8#define FUSION_NEXT_IMPL_07162005_0136
9
10#include <boost/fusion/support/config.hpp>
11#include <boost/fusion/iterator/next.hpp>
12#include <boost/fusion/iterator/equal_to.hpp>
13#include <boost/mpl/if.hpp>
14
15namespace boost { namespace fusion
16{
17 struct joint_view_iterator_tag;
18
19 template <typename Category, typename First, typename Last, typename Concat>
20 struct joint_view_iterator;
21
22 namespace extension
23 {
24 template <typename Tag>
25 struct next_impl;
26
27 template <>
28 struct next_impl<joint_view_iterator_tag>
29 {
30 template <typename Iterator>
31 struct apply
32 {
33 typedef typename Iterator::first_type first_type;
34 typedef typename Iterator::last_type last_type;
35 typedef typename Iterator::concat_type concat_type;
36 typedef typename Iterator::category category;
37 typedef typename result_of::next<first_type>::type next_type;
38 typedef result_of::equal_to<next_type, last_type> equal_to;
39
40 typedef typename
41 mpl::if_<
42 equal_to
43 , concat_type
44 , joint_view_iterator<category, next_type, last_type, concat_type>
45 >::type
46 type;
47
48 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
49 static type
50 call(Iterator const& i, mpl::true_)
51 {
52 return i.concat;
53 }
54
55 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
56 static type
57 call(Iterator const& i, mpl::false_)
58 {
59 return type(fusion::next(i.first), i.concat);
60 }
61
62 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
63 static type
64 call(Iterator const& i)
65 {
66 return call(i, equal_to());
67 }
68 };
69 };
70 }
71}}
72
73#endif
74
75
76

source code of include/boost/fusion/view/joint_view/detail/next_impl.hpp