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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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(FUSION_AT_IMPL_05042005_0741)
#define FUSION_AT_IMPL_05042005_0741
#include <boost/fusion/support/detail/access.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/int.hpp>
namespace boost { namespace fusion
{
struct vector_tag;
namespace extension
{
template <typename Tag>
struct at_impl;
template <>
struct at_impl<vector_tag>
{
template <typename Sequence, typename N>
struct apply
{
typedef typename mpl::at<typename Sequence::types, N>::type element;
typedef typename detail::ref_result<element>::type type;
static type
call(Sequence& v)
{
return v.at_impl(N());
}
};
template <typename Sequence, typename N>
struct apply <Sequence const, N>
{
typedef typename mpl::at<typename Sequence::types, N>::type element;
typedef typename detail::cref_result<element>::type type;
static type
call(Sequence const& v)
{
return v.at_impl(N());
}
};
};
}
}}
#endif
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