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