ceph/src/boost/libs/fusion/include/boost/fusion/support/sequence_base.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2007 Tobias Schwinger
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(FUSION_SEQUENCE_BASE_04182005_0737)
   9 #define FUSION_SEQUENCE_BASE_04182005_0737
  10
  11 #include <boost/config.hpp>
  12 #include <boost/fusion/support/config.hpp>
  13 #include <boost/mpl/begin_end_fwd.hpp>
  14
  15 namespace boost { namespace fusion
  16 {
  17     namespace detail
  18     {
  19         struct from_sequence_convertible_type
  20         {};
  21     }
  22
  23     template <typename Sequence>
  24     struct sequence_base
  25     {
  26         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  27         Sequence const&
  28         derived() const BOOST_NOEXCEPT
  29         {
  30             return static_cast<Sequence const&>(*this);
  31         }
  32
  33         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  34         Sequence&
  35         derived() BOOST_NOEXCEPT
  36         {
  37             return static_cast<Sequence&>(*this);
  38         }
  39
  40         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
  41         operator detail::from_sequence_convertible_type() const BOOST_NOEXCEPT
  42         {
  43             return detail::from_sequence_convertible_type();
  44         }
  45     };
  46
  47     struct fusion_sequence_tag;
  48 }}
  49
  50 namespace boost { namespace mpl
  51 {
  52     // Deliberately break mpl::begin, so it doesn't lie that a Fusion sequence
  53     // is not an MPL sequence by returning mpl::void_.
  54     // In other words: Fusion Sequences are always MPL Sequences, but they can
  55     // be incompletely defined.
  56     template<> struct begin_impl< boost::fusion::fusion_sequence_tag >;
  57 }}
  58
  59 #endif