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_VIEW_03202006_0015)
Chris@16: #define FUSION_IS_VIEW_03202006_0015
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/mpl/bool.hpp>
Chris@16: #include <boost/fusion/support/detail/is_view.hpp>
Chris@16: #include <boost/fusion/support/tag_of.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     // Special tags:
Chris@16:     struct sequence_facade_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 Tag>
Chris@16:         struct is_view_impl
Chris@16:         {
Chris@16:             template <typename T>
Chris@16:             struct apply
Chris@16:                 : detail::fusion_is_view<T>
Chris@16:             {};
Chris@16:         };
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_view_impl<sequence_facade_tag>
Chris@16:         {
Chris@16:             template <typename Sequence>
Chris@16:             struct apply : Sequence::is_view {};
Chris@16:         };
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_view_impl<boost_tuple_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_view_impl<boost_array_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_view_impl<mpl_sequence_tag>;
Chris@16: 
Chris@16:         template <>
Chris@16:         struct is_view_impl<std_pair_tag>;
Chris@16:     }
Chris@16: 
Chris@16:     namespace traits
Chris@16:     {
Chris@16:         template <typename T>
Chris@16:         struct is_view :
Chris@16:             mpl::bool_<
Chris@16:                 (bool)extension::is_view_impl<typename fusion::detail::tag_of<T>::type>::
Chris@16:                     template apply<T>::type::value
Chris@16:             >
Chris@16:         {};
Chris@16:     }
Chris@16: }}
Chris@16: 
Chris@16: #endif