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59 lines
2.0 KiB
59 lines
2.0 KiB
/*============================================================================= |
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Copyright (c) 2005-2011 Joel de Guzman |
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Copyright (c) 2005-2006 Dan Marsden |
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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(BOOST_FUSION_DEQUE_AT_IMPL_09122006_2017) |
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#define BOOST_FUSION_DEQUE_AT_IMPL_09122006_2017 |
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#include <boost/fusion/container/deque/detail/keyed_element.hpp> |
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#include <boost/mpl/eval_if.hpp> |
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#include <boost/mpl/equal_to.hpp> |
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#include <boost/mpl/assert.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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#include <boost/type_traits/add_reference.hpp> |
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namespace boost { namespace fusion { |
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struct deque_tag; |
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namespace extension |
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{ |
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template<typename T> |
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struct at_impl; |
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template<> |
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struct at_impl<deque_tag> |
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{ |
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template<typename Sequence, typename N> |
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struct apply |
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{ |
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typedef typename Sequence::next_up next_up; |
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typedef typename Sequence::next_down next_down; |
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BOOST_MPL_ASSERT_RELATION(next_down::value, !=, next_up::value); |
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typedef mpl::plus<next_down, mpl::int_<1> > offset; |
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typedef mpl::int_<mpl::plus<N, offset>::value> adjusted_index; |
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typedef typename detail::keyed_element_value_at<Sequence, adjusted_index>::type element_type; |
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typedef typename add_reference< |
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typename mpl::eval_if< |
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is_const<Sequence>, |
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add_const<element_type>, |
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mpl::identity<element_type> >::type>::type type; |
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static type call(Sequence& seq) |
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{ |
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return seq.get(adjusted_index()); |
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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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