47 lines
1.5 KiB
Plaintext
47 lines
1.5 KiB
Plaintext
/*=============================================================================
|
|
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
|