1 /*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
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_BEGIN_IMPL_07162005_0115)
8 #define FUSION_BEGIN_IMPL_07162005_0115
10 #include <boost/fusion/support/config.hpp>
11 #include <boost/fusion/iterator/equal_to.hpp>
12 #include <boost/mpl/if.hpp>
14 namespace boost { namespace fusion
16 struct joint_view_tag;
18 template <typename Category, typename First, typename Last, typename Concat>
19 struct joint_view_iterator;
23 template <typename Tag>
27 struct begin_impl<joint_view_tag>
29 template <typename Sequence>
32 typedef typename Sequence::first_type first_type;
33 typedef typename Sequence::last_type last_type;
34 typedef typename Sequence::concat_type concat_type;
35 typedef typename Sequence::category category;
36 typedef result_of::equal_to<first_type, last_type> equal_to;
42 , joint_view_iterator<category, first_type, last_type, concat_type>
46 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
48 call(Sequence& s, mpl::true_)
53 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
55 call(Sequence& s, mpl::false_)
57 return type(s.first(), s.concat());
60 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
64 return call(s, equal_to());