// (C) Copyright Jonathan Turkanis 2003.

 // 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.)

 // See http://www.boost.org/libs/iostreams for documentation.

 #ifndef BOOST_IOSTREAMS_INPUT_SEQUENCE_HPP_INCLUDED

 #define BOOST_IOSTREAMS_INPUT_SEQUENCE_HPP_INCLUDED

 #if defined(_MSC_VER) && (_MSC_VER >= 1020)

 # pragma once

 #endif

 #include <utility>           // pair.

 #include <boost/config.hpp>  // DEDUCED_TYPENAME, MSVC.

 #include <boost/detail/workaround.hpp>

 #include <boost/iostreams/detail/wrap_unwrap.hpp>

 #include <boost/iostreams/traits.hpp>

 #include <boost/mpl/if.hpp>

 // Must come last.

 #include <boost/iostreams/detail/config/disable_warnings.hpp>

 namespace boost { namespace iostreams {

 namespace detail {

 template<typename T>

 struct input_sequence_impl;

 } // End namespace detail.

 template<typename T>

 inline std::pair<

     BOOST_DEDUCED_TYPENAME char_type_of<T>::type*,

     BOOST_DEDUCED_TYPENAME char_type_of<T>::type*

 >

 input_sequence(T& t)

 { return detail::input_sequence_impl<T>::input_sequence(t); }

 namespace detail {

 //------------------Definition of direct_impl-------------------------------//

 template<typename T>

 struct input_sequence_impl

     : mpl::if_<

           detail::is_custom<T>,

           operations<T>,

           input_sequence_impl<direct_tag>

       >::type

     { };

 template<>

 struct input_sequence_impl<direct_tag> {

     template<typename U>

     static std::pair<

         BOOST_DEDUCED_TYPENAME char_type_of<U>::type*,

         BOOST_DEDUCED_TYPENAME char_type_of<U>::type*

     >

     input_sequence(U& u) { return u.input_sequence(); }

 };

 } // End namespace detail.

 } } // End namespaces iostreams, boost.

 #include <boost/iostreams/detail/config/enable_warnings.hpp>

 #endif // #ifndef BOOST_IOSTREAMS_INPUT_SEQUENCE_HPP_INCLUDED