/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
==============================================================================*/
#if !defined(FUSION_IS_SEQUENCE_05052005_1002)
#define FUSION_IS_SEQUENCE_05052005_1002

#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/support/tag_of.hpp>
#include <boost/fusion/support/detail/is_native_fusion_sequence.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/is_sequence.hpp>
#include <boost/type_traits/is_convertible.hpp>

namespace boost {
namespace fusion {
// Special tags:
struct non_fusion_tag;
struct boost_tuple_tag; // boost::tuples::tuple tag
struct boost_array_tag; // boost::array tag
struct mpl_sequence_tag; // mpl sequence tag
struct std_pair_tag; // std::pair tag

namespace extension {
template <typename T>
struct is_sequence_impl
{
    template <typename Sequence>
    struct apply
        : is_convertible<Sequence, fusion::detail::from_sequence_convertible_type>
    {};
};

template <>
struct is_sequence_impl<non_fusion_tag>
{
    template <typename T>
    struct apply : mpl::false_ {};
};

template <>
struct is_sequence_impl<boost_tuple_tag>;

template <>
struct is_sequence_impl<boost_array_tag>;

template <>
struct is_sequence_impl<mpl_sequence_tag>;

template <>
struct is_sequence_impl<std_pair_tag>;
}

namespace traits {
template <typename T>
struct is_sequence
    : mpl::bool_<
  (bool)extension::is_sequence_impl<
  typename fusion::detail::tag_of<T>::type
  >::template apply<T>::type::value
>
{};

using detail::is_native_fusion_sequence;
}
}
}

#endif
