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_PRIOR_IMPL_05042005_1145)
8#define FUSION_PRIOR_IMPL_05042005_1145
9
10#include <boost/fusion/support/config.hpp>
11#include <boost/fusion/container/vector/vector_iterator.hpp>
12
13namespace boost { namespace fusion
14{
15 struct vector_iterator_tag;
16 template <typename Vector, int N>
17 struct vector_iterator;
18
19 namespace extension
20 {
21 template <typename Tag>
22 struct prior_impl;
23
24 template <>
25 struct prior_impl<vector_iterator_tag>
26 {
27 template <typename Iterator>
28 struct apply
29 {
30 typedef typename Iterator::vector vector;
31 typedef typename Iterator::index index;
32 typedef vector_iterator<vector, index::value-1> type;
33
34 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
35 static type
36 call(Iterator const& i)
37 {
38 return type(i.vec);
39 }
40 };
41 };
42 }
43}}
44
45#endif
46