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1 /*=============================================================================
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2 Copyright (c) 2001-2011 Joel de Guzman
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3 Copyright (c) 2007 Tobias Schwinger
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4
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5 Distributed under the Boost Software License, Version 1.0. (See accompanying
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6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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7 ==============================================================================*/
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8 #if !defined(FUSION_SEQUENCE_BASE_04182005_0737)
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9 #define FUSION_SEQUENCE_BASE_04182005_0737
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10
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11 #include <boost/config.hpp>
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12 #include <boost/fusion/support/config.hpp>
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13 #include <boost/mpl/begin_end_fwd.hpp>
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14
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15 namespace boost { namespace fusion
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16 {
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17 namespace detail
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18 {
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19 struct from_sequence_convertible_type
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20 {};
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21 }
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22
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23 template <typename Sequence>
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24 struct sequence_base
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25 {
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26 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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27 Sequence const&
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28 derived() const BOOST_NOEXCEPT
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29 {
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30 return static_cast<Sequence const&>(*this);
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31 }
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32
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33 BOOST_CXX14_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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34 Sequence&
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35 derived() BOOST_NOEXCEPT
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36 {
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37 return static_cast<Sequence&>(*this);
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38 }
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39
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40 BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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41 operator detail::from_sequence_convertible_type() const BOOST_NOEXCEPT
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42 {
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43 return detail::from_sequence_convertible_type();
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44 }
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45 };
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46
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47 struct fusion_sequence_tag;
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48 }}
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49
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50 namespace boost { namespace mpl
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51 {
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52 // Deliberately break mpl::begin, so it doesn't lie that a Fusion sequence
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53 // is not an MPL sequence by returning mpl::void_.
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54 // In other words: Fusion Sequences are always MPL Sequences, but they can
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55 // be incompletely defined.
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56 template<> struct begin_impl< boost::fusion::fusion_sequence_tag >;
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57 }}
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58
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59 #endif
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