| 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_IS_SEQUENCE_05052005_1002) |
| 8 | #define FUSION_IS_SEQUENCE_05052005_1002 |
| 9 | |
| 10 | #include <boost/fusion/support/config.hpp> |
| 11 | #include <boost/fusion/support/sequence_base.hpp> |
| 12 | #include <boost/fusion/support/tag_of.hpp> |
| 13 | #include <boost/fusion/support/detail/is_native_fusion_sequence.hpp> |
| 14 | #include <boost/mpl/bool.hpp> |
| 15 | #include <boost/mpl/is_sequence.hpp> |
| 16 | #include <boost/type_traits/is_convertible.hpp> |
| 17 | |
| 18 | namespace boost { namespace fusion |
| 19 | { |
| 20 | // Special tags: |
| 21 | struct non_fusion_tag; |
| 22 | struct boost_tuple_tag; // boost::tuples::tuple tag |
| 23 | struct boost_array_tag; // boost::array tag |
| 24 | struct mpl_sequence_tag; // mpl sequence tag |
| 25 | struct std_pair_tag; // std::pair tag |
| 26 | |
| 27 | namespace extension |
| 28 | { |
| 29 | template <typename T> |
| 30 | struct is_sequence_impl |
| 31 | { |
| 32 | template <typename Sequence> |
| 33 | struct apply |
| 34 | : is_convertible<Sequence, fusion::detail::from_sequence_convertible_type> |
| 35 | {}; |
| 36 | }; |
| 37 | |
| 38 | template <> |
| 39 | struct is_sequence_impl<non_fusion_tag> |
| 40 | { |
| 41 | template <typename T> |
| 42 | struct apply : mpl::false_ {}; |
| 43 | }; |
| 44 | |
| 45 | template <> |
| 46 | struct is_sequence_impl<boost_tuple_tag>; |
| 47 | |
| 48 | template <> |
| 49 | struct is_sequence_impl<boost_array_tag>; |
| 50 | |
| 51 | template <> |
| 52 | struct is_sequence_impl<mpl_sequence_tag>; |
| 53 | |
| 54 | template <> |
| 55 | struct is_sequence_impl<std_pair_tag>; |
| 56 | } |
| 57 | |
| 58 | namespace traits |
| 59 | { |
| 60 | template <typename T> |
| 61 | struct is_sequence |
| 62 | : mpl::bool_< |
| 63 | (bool)extension::is_sequence_impl< |
| 64 | typename fusion::detail::tag_of<T>::type |
| 65 | >::template apply<T>::type::value |
| 66 | > |
| 67 | {}; |
| 68 | |
| 69 | using detail::is_native_fusion_sequence; |
| 70 | } |
| 71 | }} |
| 72 | |
| 73 | #endif |
| 74 |