| /*============================================================================= |
| Copyright (c) 2001-2006 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/mpl/begin_end_fwd.hpp> |
| |
| namespace boost { namespace fusion |
| { |
| struct sequence_root {}; |
| |
| template <typename Sequence> |
| struct sequence_base : sequence_root |
| { |
| Sequence const& |
| derived() const |
| { |
| return static_cast<Sequence const&>(*this); |
| } |
| |
| Sequence& |
| derived() |
| { |
| return static_cast<Sequence&>(*this); |
| } |
| }; |
| |
| 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 |