/*============================================================================= | |
Copyright (c) 2001-2006 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 mpl::at<typename Sequence::types, N> 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 mpl::at<typename Sequence::types, N> element; | |
typedef typename detail::cref_result<element>::type type; | |
static type | |
call(Sequence const& v) | |
{ | |
return v.at_impl(N()); | |
} | |
}; | |
}; | |
} | |
}} | |
#endif |