// (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_OPERATIONS_FWD_HPP_INCLUDED

 #define BOOST_IOSTREAMS_OPERATIONS_FWD_HPP_INCLUDED

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

 # pragma once

 #endif

 #include <boost/mpl/not.hpp>

 #include <boost/type_traits/is_base_and_derived.hpp>

 namespace boost { namespace iostreams {

 template<typename T>

 struct operations;

 namespace detail {

 struct custom_tag { };

 template<typename T>

 struct is_custom

     : mpl::not_<

           is_base_and_derived< custom_tag, operations<T> >

       >

     { };

 } // End namespace detail.

 template<typename T>

 struct operations : detail::custom_tag { };

 } } // End namespaces iostreams, boost.

 #endif // #ifndef BOOST_IOSTREAMS_OPERATIONS_FWD_HPP_INCLUDED //--------------//