boost/iostreams/detail/dispatch.hpp

   1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
   2 // (C) Copyright 2003-2007 Jonathan Turkanis
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
   5
   6 // See http://www.boost.org/libs/iostreams for documentation.
   7
   8 #ifndef BOOST_IOSTREAMS_DETAIL_DISPATCH_HPP_INCLUDED
   9 #define BOOST_IOSTREAMS_DETAIL_DISPATCH_HPP_INCLUDED
  10
  11 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  12 # pragma once
  13 #endif
  14
  15 #include <boost/config.hpp>                   // BOOST_DEDUCED_TYPENAME.
  16 #include <boost/iostreams/detail/select.hpp>
  17 #include <boost/iostreams/traits.hpp>         // category_of.
  18 #include <boost/mpl/void.hpp>
  19 #include <boost/type_traits/is_convertible.hpp>
  20
  21 namespace boost { namespace iostreams {namespace detail {
  22
  23 template< typename T, typename Tag1, typename Tag2,
  24           typename Tag3 = mpl::void_, typename Tag4 = mpl::void_,
  25           typename Tag5 = mpl::void_, typename Tag6 = mpl::void_,
  26           typename Category =
  27               BOOST_DEDUCED_TYPENAME category_of<T>::type >
  28 struct dispatch
  29     : iostreams::select<  // Disambiguation for Tru64.
  30           is_convertible<Category, Tag1>, Tag1,
  31           is_convertible<Category, Tag2>, Tag2,
  32           is_convertible<Category, Tag3>, Tag3,
  33           is_convertible<Category, Tag4>, Tag4,
  34           is_convertible<Category, Tag5>, Tag5,
  35           is_convertible<Category, Tag6>, Tag6
  36       >
  37     { };
  38
  39 } } } // End namespaces detail, iostreams, boost.
  40
  41 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_DISPATCH_HPP_INCLUDED