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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_VALUE_AT_IMPL_08122006_0756)
#define BOOST_FUSION_DEQUE_VALUE_AT_IMPL_08122006_0756
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/container/deque/detail/keyed_element.hpp>
#include <boost/mpl/equal_to.hpp>
#include <boost/mpl/assert.hpp>
namespace boost { namespace fusion
{
struct deque_tag;
namespace extension
{
template<typename T>
struct value_at_impl;
template<>
struct value_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
type;
};
};
}
}}
#endif
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