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55 lines
1.6 KiB
55 lines
1.6 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_DEREF_IMPL_07172005_0831)
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#define FUSION_DEREF_IMPL_07172005_0831
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#include <boost/fusion/support/config.hpp>
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#include <boost/mpl/eval_if.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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#include <boost/type_traits/add_reference.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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namespace extension
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{
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template <typename Tag>
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struct deref_impl;
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template <>
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struct deref_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::car_type value_type;
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typedef typename mpl::eval_if<
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is_const<cons_type>
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, add_reference<typename add_const<value_type>::type>
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, add_reference<value_type> >::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 i.cons.car;
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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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