/*============================================================================= | |
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 | |
{ | |
namespace detail | |
{ | |
struct from_sequence_convertible_type | |
{}; | |
} | |
template <typename Sequence> | |
struct sequence_base | |
{ | |
Sequence const& | |
derived() const | |
{ | |
return static_cast<Sequence const&>(*this); | |
} | |
Sequence& | |
derived() | |
{ | |
return static_cast<Sequence&>(*this); | |
} | |
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 |