Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(FUSION_IS_SEQUENCE_05052005_1002)
Chris@16: #define FUSION_IS_SEQUENCE_05052005_1002
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/fusion/support/sequence_base.hpp>
Chris@16: #include <boost/fusion/support/tag_of.hpp>
Chris@16: #include <boost/mpl/is_sequence.hpp>
Chris@16: #include <boost/mpl/or.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/type_traits/is_convertible.hpp>
Chris@16: #include <boost/type_traits/is_same.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     // Special tags:
Chris@16:     struct non_fusion_tag;
Chris@16:     struct boost_tuple_tag; // boost::tuples::tuple tag
Chris@16:     struct boost_array_tag; // boost::array tag
Chris@16:     struct mpl_sequence_tag; // mpl sequence tag
Chris@16:     struct std_pair_tag; // std::pair tag
Chris@16: 
Chris@16:     namespace extension
Chris@16:     {
Chris@16:         template <typename T>
Chris@16:         struct is_sequence_impl
Chris@16:         {
Chris@16:             template <typename Sequence>
Chris@16:             struct apply
Chris@101:               : is_convertible<Sequence, fusion::detail::from_sequence_convertible_type>
Chris@16:             {};
Chris@16:         };
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_sequence_impl<non_fusion_tag>
Chris@16:         {
Chris@16:             template <typename T>
Chris@16:             struct apply : mpl::false_ {};
Chris@16:         };
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_sequence_impl<boost_tuple_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_sequence_impl<boost_array_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_sequence_impl<mpl_sequence_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_sequence_impl<std_pair_tag>;
Chris@16:     }
Chris@16: 
Chris@16:     namespace traits
Chris@16:     {
Chris@16:         template <typename T>
Chris@16:         struct is_sequence
Chris@16:           : mpl::bool_<
Chris@16:                 (bool)extension::is_sequence_impl<
Chris@101:                     typename fusion::detail::tag_of<T>::type
Chris@16:                 >::template apply<T>::type::value
Chris@16:             >
Chris@16:         {};
Chris@16: 
Chris@16:         template <typename Sequence, typename Enable = void>
Chris@16:         struct is_native_fusion_sequence
Chris@101:           : is_convertible<Sequence, fusion::detail::from_sequence_convertible_type>
Chris@16:         {};
Chris@16:     }
Chris@16: }}
Chris@16: 
Chris@16: #endif