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