/*============================================================================= | |
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_DEREF_IMPL_05042005_1037) | |
#define FUSION_DEREF_IMPL_05042005_1037 | |
#include <boost/mpl/at.hpp> | |
#include <boost/fusion/support/detail/access.hpp> | |
#include <boost/type_traits/is_const.hpp> | |
namespace boost { namespace fusion | |
{ | |
struct vector_iterator_tag; | |
namespace extension | |
{ | |
template <typename Tag> | |
struct deref_impl; | |
template <> | |
struct deref_impl<vector_iterator_tag> | |
{ | |
template <typename Iterator> | |
struct apply | |
{ | |
typedef typename Iterator::vector vector; | |
typedef typename Iterator::index index; | |
typedef typename mpl::at< | |
typename vector::types, index> | |
element; | |
typedef typename | |
mpl::eval_if< | |
is_const<vector> | |
, fusion::detail::cref_result<element> | |
, fusion::detail::ref_result<element> | |
>::type | |
type; | |
static type | |
call(Iterator const& i) | |
{ | |
return i.vec.at_impl(index()); | |
} | |
}; | |
}; | |
} | |
}} | |
#endif |