/*=============================================================================
    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_VIEW_03202006_0015)
#define FUSION_IS_VIEW_03202006_0015

#include <boost/fusion/support/config.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/fusion/support/tag_of.hpp>

namespace boost {
namespace fusion {
// Special tags:
struct non_fusion_tag;
struct sequence_facade_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 Tag>
struct is_view_impl
{
    template <typename T>
    struct apply
    {
        typedef typename T::is_view type;
    };
};

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

template <>
struct is_view_impl<sequence_facade_tag>
{
    template <typename Sequence>
    struct apply : Sequence::is_view {};
};

template <>
struct is_view_impl<boost_tuple_tag>;

template <>
struct is_view_impl<boost_array_tag>;

template <>
struct is_view_impl<mpl_sequence_tag>;

template <>
struct is_view_impl<std_pair_tag>;
}

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

#endif
