ceph/src/boost/libs/fusion/include/boost/fusion/container/list/detail/empty_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2007 Tobias Schwinger
   3
   4     Distributed under the Boost Software License, Version 1.0. (See accompanying
   5     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 ==============================================================================*/
   7 #if !defined(BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED)
   8 #define BOOST_FUSION_SEQUENCE_EMPTY_IMPL_HPP_INCLUDED
   9
  10 #include <boost/fusion/support/config.hpp>
  11 #include <boost/type_traits/is_convertible.hpp>
  12 #include <boost/fusion/container/list/nil.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct cons_tag;
  17
  18     struct nil_;
  19
  20     template <typename Car, typename Cdr>
  21     struct cons;
  22
  23     namespace extension
  24     {
  25         template <typename Tag>
  26         struct empty_impl;
  27
  28         template <>
  29         struct empty_impl<cons_tag>
  30         {
  31             template <typename Sequence>
  32             struct apply
  33                 : boost::is_convertible<Sequence, nil_>
  34             {};
  35         };
  36     }
  37 }}
  38
  39 #endif