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