1/*=============================================================================
2 Copyright (c) 2001-2011 Joel de Guzman
3
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6==============================================================================*/
7#if !defined(FUSION_DEREF_IMPL_05042005_1037)
8#define FUSION_DEREF_IMPL_05042005_1037
9
10#include <boost/fusion/support/config.hpp>
11#include <boost/fusion/support/detail/access.hpp>
12#include <boost/fusion/container/vector/detail/value_at_impl.hpp>
13#include <boost/type_traits/is_const.hpp>
14#include <boost/mpl/if.hpp>
15
16namespace boost { namespace fusion
17{
18 struct vector_iterator_tag;
19
20 namespace extension
21 {
22 template <typename Tag>
23 struct deref_impl;
24
25 template <>
26 struct deref_impl<vector_iterator_tag>
27 {
28 template <typename Iterator>
29 struct apply
30 {
31 typedef typename Iterator::vector vector;
32 typedef typename Iterator::index index;
33 typedef typename value_at_impl<vector_tag>::template apply<vector, index>::type element;
34
35 typedef typename
36 mpl::if_<
37 is_const<vector>
38 , typename fusion::detail::cref_result<element>::type
39 , typename fusion::detail::ref_result<element>::type
40 >::type
41 type;
42
43 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
44 static type
45 call(Iterator const& i)
46 {
47 return i.vec.at_impl(index());
48 }
49 };
50 };
51 }
52}}
53
54#endif
55