iostreams/detail/dispatch.hpp

0001 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
0002 // (C) Copyright 2003-2007 Jonathan Turkanis
0003 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0004 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
0005
0006 // See http://www.boost.org/libs/iostreams for documentation.
0007
0008 #ifndef BOOST_IOSTREAMS_DETAIL_DISPATCH_HPP_INCLUDED
0009 #define BOOST_IOSTREAMS_DETAIL_DISPATCH_HPP_INCLUDED
0010
0011 #if defined(_MSC_VER)
0012 # pragma once
0013 #endif
0014
0015 #include <boost/config.hpp>                   // BOOST_DEDUCED_TYPENAME.
0016 #include <boost/iostreams/detail/select.hpp>
0017 #include <boost/iostreams/traits.hpp>         // category_of.
0018 #include <boost/mpl/void.hpp>
0019 #include <boost/type_traits/is_convertible.hpp>
0020
0021 namespace boost { namespace iostreams {namespace detail {
0022
0023 template< typename T, typename Tag1, typename Tag2,
0024           typename Tag3 = mpl::void_, typename Tag4 = mpl::void_,
0025           typename Tag5 = mpl::void_, typename Tag6 = mpl::void_,
0026           typename Category =
0027               BOOST_DEDUCED_TYPENAME category_of<T>::type >
0028 struct dispatch
0029     : iostreams::select<  // Disambiguation for Tru64.
0030           is_convertible<Category, Tag1>, Tag1,
0031           is_convertible<Category, Tag2>, Tag2,
0032           is_convertible<Category, Tag3>, Tag3,
0033           is_convertible<Category, Tag4>, Tag4,
0034           is_convertible<Category, Tag5>, Tag5,
0035           is_convertible<Category, Tag6>, Tag6
0036       >
0037     { };
0038
0039 } } } // End namespaces detail, iostreams, boost.
0040
0041 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_DISPATCH_HPP_INCLUDED