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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | Copyright (c) 2007 Tobias Schwinger | |
4 | ||
5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
7 | ==============================================================================*/ | |
8 | #if !defined(FUSION_SEQUENCE_BASE_04182005_0737) | |
9 | #define FUSION_SEQUENCE_BASE_04182005_0737 | |
10 | ||
11 | #include <boost/config.hpp> | |
12 | #include <boost/fusion/support/config.hpp> | |
13 | #include <boost/mpl/begin_end_fwd.hpp> | |
14 | ||
15 | namespace boost { namespace fusion | |
16 | { | |
17 | namespace detail | |
18 | { | |
19 | struct from_sequence_convertible_type | |
20 | {}; | |
21 | } | |
22 | ||
23 | template <typename Sequence> | |
24 | struct sequence_base | |
25 | { | |
26 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
27 | Sequence const& | |
28 | derived() const BOOST_NOEXCEPT | |
29 | { | |
30 | return static_cast<Sequence const&>(*this); | |
31 | } | |
32 | ||
33 | BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
34 | Sequence& | |
35 | derived() BOOST_NOEXCEPT | |
36 | { | |
37 | return static_cast<Sequence&>(*this); | |
38 | } | |
39 | ||
40 | BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED | |
41 | operator detail::from_sequence_convertible_type() const BOOST_NOEXCEPT | |
42 | { | |
43 | return detail::from_sequence_convertible_type(); | |
44 | } | |
45 | }; | |
46 | ||
47 | struct fusion_sequence_tag; | |
48 | }} | |
49 | ||
50 | namespace boost { namespace mpl | |
51 | { | |
52 | // Deliberately break mpl::begin, so it doesn't lie that a Fusion sequence | |
53 | // is not an MPL sequence by returning mpl::void_. | |
54 | // In other words: Fusion Sequences are always MPL Sequences, but they can | |
55 | // be incompletely defined. | |
56 | template<> struct begin_impl< boost::fusion::fusion_sequence_tag >; | |
57 | }} | |
58 | ||
59 | #endif |