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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_TAG_OF_09232005_0845) | |
8 | #define FUSION_TAG_OF_09232005_0845 | |
9 | ||
10 | #include <boost/fusion/support/config.hpp> | |
11 | #include <boost/utility/enable_if.hpp> | |
12 | #include <boost/type_traits/remove_const.hpp> | |
13 | #include <boost/fusion/support/tag_of_fwd.hpp> | |
14 | #include <boost/fusion/support/detail/is_mpl_sequence.hpp> | |
15 | #include <boost/mpl/has_xxx.hpp> | |
16 | #include <boost/mpl/identity.hpp> | |
17 | #include <boost/mpl/assert.hpp> | |
18 | #include <boost/mpl/bool.hpp> | |
19 | #include <boost/mpl/if.hpp> | |
20 | #include <boost/config/no_tr1/utility.hpp> | |
21 | ||
22 | namespace boost | |
23 | { | |
24 | template <typename T, std::size_t N> | |
25 | class array; // forward | |
26 | ||
27 | namespace tuples | |
28 | { | |
29 | struct null_type; | |
30 | ||
31 | template < | |
32 | class T0, class T1, class T2, class T3, class T4, | |
33 | class T5, class T6, class T7, class T8, class T9 | |
34 | > | |
35 | class tuple; | |
36 | ||
37 | template <class Head, class Tail> | |
38 | struct cons; | |
39 | } | |
40 | } | |
41 | ||
42 | namespace boost { namespace fusion | |
43 | { | |
44 | struct non_fusion_tag; | |
45 | struct mpl_sequence_tag; | |
46 | ||
47 | namespace detail | |
48 | { | |
49 | BOOST_MPL_HAS_XXX_TRAIT_DEF(fusion_tag) | |
50 | ||
51 | template <typename Sequence, typename Active> | |
52 | struct tag_of_impl | |
53 | : mpl::if_<fusion::detail::is_mpl_sequence<Sequence>, | |
54 | mpl::identity<mpl_sequence_tag>, | |
55 | mpl::identity<non_fusion_tag> >::type | |
56 | {}; | |
57 | ||
58 | template <typename Sequence> | |
59 | struct tag_of_impl< | |
60 | Sequence | |
61 | , typename boost::enable_if<detail::has_fusion_tag<Sequence> >::type> | |
62 | { | |
63 | typedef typename Sequence::fusion_tag type; | |
64 | }; | |
65 | } | |
66 | ||
67 | namespace traits | |
68 | { | |
69 | template <typename Sequence, typename Active> | |
70 | struct tag_of | |
71 | : boost::fusion::detail::tag_of_impl<Sequence, Active> | |
72 | {}; | |
73 | } | |
74 | ||
75 | namespace detail | |
76 | { | |
77 | template<typename T> | |
78 | struct tag_of | |
79 | : traits::tag_of<typename remove_const<T>::type> | |
80 | {}; | |
81 | } | |
82 | }} | |
83 | #endif |