boost/iostreams/operations_fwd.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_OPERATIONS_FWD_HPP_INCLUDED
   9 #define BOOST_IOSTREAMS_OPERATIONS_FWD_HPP_INCLUDED
  10
  11 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  12 # pragma once
  13 #endif
  14
  15 #include <boost/mpl/not.hpp>
  16 #include <boost/type_traits/is_base_and_derived.hpp>
  17
  18 namespace boost { namespace iostreams {
  19
  20 template<typename T>
  21 struct operations;
  22
  23 namespace detail {
  24
  25 struct custom_tag { };
  26
  27 template<typename T>
  28 struct is_custom
  29     : mpl::not_<
  30           is_base_and_derived< custom_tag, operations<T> >
  31       >
  32     { };
  33
  34 } // End namespace detail.
  35
  36 template<typename T>
  37 struct operations : detail::custom_tag { };
  38
  39 } } // End namespaces iostreams, boost.
  40
  41 #endif // #ifndef BOOST_IOSTREAMS_OPERATIONS_FWD_HPP_INCLUDED //--------------//