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62 lines
1.7 KiB
62 lines
1.7 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005 Eric Niebler
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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_NEXT_IMPL_07172005_0836)
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#define FUSION_NEXT_IMPL_07172005_0836
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/next.hpp>
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#include <boost/fusion/iterator/equal_to.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/add_const.hpp>
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namespace boost { namespace fusion
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{
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struct cons_iterator_tag;
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template <typename Cons>
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struct cons_iterator;
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namespace extension
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{
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template <typename Tag>
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struct next_impl;
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template <>
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struct next_impl<cons_iterator_tag>
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{
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template <typename Iterator>
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struct apply
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{
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typedef typename Iterator::cons_type cons_type;
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typedef typename cons_type::cdr_type cdr_type;
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typedef cons_iterator<
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typename mpl::eval_if<
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is_const<cons_type>
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, add_const<cdr_type>
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, mpl::identity<cdr_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(Iterator const& i)
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{
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return type(i.cons.cdr);
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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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