
#ifndef BOOST_NETWORK_MESSAGE_TRAITS_HEADERS_HPP_20100903
#define BOOST_NETWORK_MESSAGE_TRAITS_HEADERS_HPP_20100903

// Copyright Dean Michael Berris 2010.
// 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)

#include <boost/network/tags.hpp>
#include <boost/network/traits/string.hpp>
#include <boost/network/support/is_async.hpp>
#include <boost/network/support/is_sync.hpp>
#include <boost/thread/future.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/or.hpp>

namespace boost { namespace network { 
    
    namespace traits {

        template <class Tag>
        struct unsupported_tag;

        template <class Message>
        struct header_key :
            mpl::if_<
                is_async<typename Message::tag>,
                boost::shared_future<typename string<typename Message::tag>::type>,
                typename mpl::if_<
                    mpl::or_<
                        is_sync<typename Message::tag>,
                        is_same<typename Message::tag, tags::default_string>,
                        is_same<typename Message::tag, tags::default_wstring>
                    >,
                    typename string<typename Message::tag>::type,
                    unsupported_tag<typename Message::tag>
                >::type
            >
        {};

        template <class Message>
        struct header_value :
            mpl::if_<
                is_async<typename Message::tag>,
                boost::shared_future<typename string<typename Message::tag>::type>,
                typename mpl::if_<
                    mpl::or_<
                        is_sync<typename Message::tag>,
                        is_same<typename Message::tag, tags::default_string>,
                        is_same<typename Message::tag, tags::default_wstring>
                    >,
                    typename string<typename Message::tag>::type,
                    unsupported_tag<typename Message::tag>
                >::type
            >
        {};

    } // namespace traits

} /* network */

} /* boost */

#endif // BOOST_NETWORK_MESSAGE_TRAITS_HEADERS_HPP_20100903

