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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_BACK_09162005_0350) | |
8 | #define FUSION_BACK_09162005_0350 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/fusion/sequence/intrinsic_fwd.hpp> | |
12 | #include <boost/fusion/sequence/intrinsic/end.hpp> | |
13 | #include <boost/fusion/iterator/prior.hpp> | |
14 | #include <boost/fusion/iterator/deref.hpp> | |
15 | #include <boost/mpl/bool.hpp> | |
16 | ||
17 | namespace boost { namespace fusion | |
18 | { | |
19 | struct fusion_sequence_tag; | |
20 | ||
21 | namespace result_of | |
22 | { | |
23 | template <typename Sequence> | |
24 | struct back | |
25 | : result_of::deref<typename result_of::prior<typename result_of::end<Sequence>::type>::type> | |
26 | {}; | |
27 | } | |
28 | ||
29 | template <typename Sequence> | |
30 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
31 | inline typename result_of::back<Sequence>::type | |
32 | back(Sequence& seq) | |
33 | { | |
34 | return *fusion::prior(fusion::end(seq)); | |
35 | } | |
36 | ||
37 | template <typename Sequence> | |
38 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
39 | inline typename result_of::back<Sequence const>::type | |
40 | back(Sequence const& seq) | |
41 | { | |
42 | return *fusion::prior(fusion::end(seq)); | |
43 | } | |
44 | }} | |
45 | ||
46 | #endif |