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- /*=============================================================================
- Copyright (c) 2005-2012 Joel de Guzman
- Copyright (c) 2005-2006 Dan Marsden
- 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(BOOST_FUSION_DEQUE_AT_IMPL_09122006_2017)
- #define BOOST_FUSION_DEQUE_AT_IMPL_09122006_2017
- #include <boost/fusion/support/config.hpp>
- #include <boost/fusion/container/deque/detail/keyed_element.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/mpl/equal_to.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/identity.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 deque_tag;
- namespace extension
- {
- template<typename T>
- struct at_impl;
- template<>
- struct at_impl<deque_tag>
- {
- template<typename Sequence, typename N>
- struct apply
- {
- typedef typename Sequence::next_up next_up;
- typedef typename Sequence::next_down next_down;
- BOOST_MPL_ASSERT_RELATION(next_down::value, !=, next_up::value);
- static int const offset = next_down::value + 1;
- typedef mpl::int_<(N::value + offset)> adjusted_index;
- typedef typename
- detail::keyed_element_value_at<Sequence, adjusted_index>::type
- element_type;
- typedef typename
- add_reference<
- typename mpl::eval_if<
- is_const<Sequence>,
- add_const<element_type>,
- mpl::identity<element_type> >::type
- >::type
- type;
- BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
- static type call(Sequence& seq)
- {
- return seq.get(adjusted_index());
- }
- };
- };
- }
- }}
- #endif
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