/*=============================================================================
Copyright (c) 2003 Joel de Guzman
Use, modification and distribution is subject to 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_ITERATOR_DETAIL_TUPLE_ITERATOR_DEREF_TRAITS_HPP)
#define FUSION_ITERATOR_DETAIL_TUPLE_ITERATOR_DEREF_TRAITS_HPP
#include <boost/spirit/fusion/detail/config.hpp>
#include <boost/spirit/fusion/detail/access.hpp>
#include <boost/spirit/fusion/sequence/detail/tuple_access_result.hpp>
namespace boost { namespace fusion
{
struct tuple_iterator_tag;
namespace detail
{
template <int N>
struct tuple_access;
}
namespace tuple_iterator_detail
{
template <typename Iterator>
struct deref_traits_impl
{
typedef FUSION_GET_INDEX(Iterator) index;
typedef FUSION_GET_TUPLE(Iterator) tuple_;
typedef BOOST_DEDUCED_TYPENAME
boost::fusion::detail::tuple_access_result<
tuple_, FUSION_GET_VALUE(index)>::type
type;
static type
call(Iterator const& i);
};
template <typename Iterator>
inline typename deref_traits_impl<Iterator>::type
deref_traits_impl<Iterator>::call(Iterator const& i)
{
return detail::tuple_access<FUSION_GET_VALUE(index)>
::get(detail::ref(i.get_tuple()));
}
}
namespace meta
{
template <typename Tag>
struct deref_impl;
template <>
struct deref_impl<tuple_iterator_tag>
{
template <typename Iterator>
struct apply :
tuple_iterator_detail::deref_traits_impl<Iterator> {};
};
}
}}
#endif