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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- ==============================================================================*/
- #if !defined(FUSION_BEGIN_IMPL_07162005_0115)
- #define FUSION_BEGIN_IMPL_07162005_0115
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/iterator/equal_to.hpp>
- #include <boost/mpl/if.hpp>
- namespace boost { namespace fusion
- {
- struct joint_view_tag;
- template <typename Category, typename First, typename Last, typename Concat>
- struct joint_view_iterator;
- namespace extension
- {
- template <typename Tag>
- struct begin_impl;
- template <>
- struct begin_impl<joint_view_tag>
- {
- template <typename Sequence>
- struct apply
- {
- typedef typename Sequence::first_type first_type;
- typedef typename Sequence::last_type last_type;
- typedef typename Sequence::concat_type concat_type;
- typedef typename Sequence::category category;
- typedef result_of::equal_to<first_type, last_type> equal_to;
- typedef typename
- mpl::if_<
- equal_to
- , concat_type
- , joint_view_iterator<category, first_type, last_type, concat_type>
- >::type
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& s, mpl::true_)
- {
- return s.concat();
- }
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& s, mpl::false_)
- {
- return type(s.first(), s.concat());
- }
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Sequence& s)
- {
- return call(s, equal_to());
- }
- };
- };
- }
- }}
- #endif
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