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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Copyright (c) 2005 Eric Niebler
- 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_DEREF_IMPL_07172005_0831)
- #define FUSION_DEREF_IMPL_07172005_0831
- #include <boost/fusion/support/config.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/type_traits/is_const.hpp>
- #include <boost/type_traits/add_const.hpp>
- #include <boost/type_traits/add_reference.hpp>
- namespace boost { namespace fusion
- {
- struct cons_iterator_tag;
- namespace extension
- {
- template <typename Tag>
- struct deref_impl;
- template <>
- struct deref_impl<cons_iterator_tag>
- {
- template <typename Iterator>
- struct apply
- {
- typedef typename Iterator::cons_type cons_type;
- typedef typename cons_type::car_type value_type;
- typedef typename mpl::eval_if<
- is_const<cons_type>
- , add_reference<typename add_const<value_type>::type>
- , add_reference<value_type> >::type
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type
- call(Iterator const& i)
- {
- return i.cons.car;
- }
- };
- };
- }
- }}
- #endif
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