Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2001-2011 Joel de Guzman
Chris@16:     Copyright (c) 2007 Tobias Schwinger
Chris@16: 
Chris@16:     Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16:     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: ==============================================================================*/
Chris@16: #if !defined(FUSION_SEQUENCE_BASE_04182005_0737)
Chris@16: #define FUSION_SEQUENCE_BASE_04182005_0737
Chris@16: 
Chris@101: #include <boost/config.hpp>
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/mpl/begin_end_fwd.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion
Chris@16: {
Chris@16:     namespace detail
Chris@16:     {
Chris@16:         struct from_sequence_convertible_type
Chris@16:         {};
Chris@16:     }
Chris@16: 
Chris@16:     template <typename Sequence>
Chris@16:     struct sequence_base
Chris@16:     {
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         Sequence const&
Chris@101:         derived() const BOOST_NOEXCEPT
Chris@16:         {
Chris@16:             return static_cast<Sequence const&>(*this);
Chris@16:         }
Chris@16: 
Chris@101:         BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         Sequence&
Chris@101:         derived() BOOST_NOEXCEPT
Chris@16:         {
Chris@16:             return static_cast<Sequence&>(*this);
Chris@16:         }
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@101:         operator detail::from_sequence_convertible_type() const BOOST_NOEXCEPT
Chris@16:         {
Chris@16:             return detail::from_sequence_convertible_type();
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     struct fusion_sequence_tag;
Chris@16: }}
Chris@16: 
Chris@16: namespace boost { namespace mpl
Chris@16: {
Chris@16:     // Deliberately break mpl::begin, so it doesn't lie that a Fusion sequence
Chris@16:     // is not an MPL sequence by returning mpl::void_.
Chris@16:     // In other words: Fusion Sequences are always MPL Sequences, but they can
Chris@16:     // be incompletely defined.
Chris@16:     template<> struct begin_impl< boost::fusion::fusion_sequence_tag >;
Chris@16: }}
Chris@16: 
Chris@16: #endif