| 1 | // Copyright 2008 Christophe Henry |
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| 2 | // henry UNDERSCORE christophe AT hotmail DOT com |
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| 3 | // This is an extended version of the state machine available in the boost::mpl library |
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| 4 | // Distributed under the same license as the original. |
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| 5 | // Copyright for the original version: |
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| 6 | // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed |
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| 7 | // under the Boost Software License, Version 1.0. (See accompanying |
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| 8 | // file LICENSE_1_0.txt or copy at |
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| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 10 | |
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| 11 | #ifndef BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H |
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| 12 | #define BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H |
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| 13 | |
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| 14 | #include <boost/mpl/int.hpp> |
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| 15 | |
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| 16 | #include <boost/mpl/vector.hpp> |
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| 17 | #include <boost/fusion/container/vector.hpp> |
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| 18 | #include <boost/fusion/container/map.hpp> |
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| 19 | #include <boost/fusion/include/at_key.hpp> |
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| 20 | #include <boost/type_traits/add_const.hpp> |
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| 21 | |
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| 22 | namespace boost { namespace msm { namespace front {namespace detail |
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| 23 | { |
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| 24 | template <class Attributes= ::boost::fusion::map<> > |
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| 25 | struct inherit_attributes |
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| 26 | { |
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| 27 | inherit_attributes():m_attributes(){} |
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| 28 | inherit_attributes(Attributes const& the_attributes):m_attributes(the_attributes){} |
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| 29 | // on the fly attribute creation capability |
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| 30 | typedef Attributes attributes_type; |
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| 31 | template <class Index> |
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| 32 | typename ::boost::fusion::result_of::at_key<attributes_type, |
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| 33 | Index>::type |
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| 34 | get_attribute(Index const&) |
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| 35 | { |
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| 36 | return ::boost::fusion::at_key<Index>(m_attributes); |
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| 37 | } |
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| 38 | |
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| 39 | template <class Index> |
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| 40 | typename ::boost::add_const< |
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| 41 | typename ::boost::fusion::result_of::at_key<attributes_type, |
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| 42 | Index>::type>::type |
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| 43 | get_attribute(Index const&)const |
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| 44 | { |
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| 45 | return const_cast< |
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| 46 | typename ::boost::add_const< |
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| 47 | typename ::boost::fusion::result_of::at_key< attributes_type, |
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| 48 | Index >::type>::type> |
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| 49 | (::boost::fusion::at_key<Index>(m_attributes)); |
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| 50 | } |
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| 51 | |
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| 52 | private: |
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| 53 | // attributes |
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| 54 | Attributes m_attributes; |
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| 55 | }; |
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| 56 | |
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| 57 | // the interface for all states. Defines entry and exit functions. Overwrite to implement for any state needing it. |
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| 58 | template<class USERBASE,class Attributes= ::boost::fusion::map<> > |
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| 59 | struct state_base : public inherit_attributes<Attributes>, USERBASE |
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| 60 | { |
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| 61 | typedef USERBASE user_state_base; |
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| 62 | typedef Attributes attributes_type; |
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| 63 | |
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| 64 | // empty implementation for the states not wishing to define an entry condition |
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| 65 | // will not be called polymorphic way |
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| 66 | template <class Event,class FSM> |
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| 67 | void on_entry(Event const& ,FSM&){} |
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| 68 | template <class Event,class FSM> |
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| 69 | void on_exit(Event const&,FSM& ){} |
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| 70 | // default (empty) transition table; |
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| 71 | typedef ::boost::mpl::vector<> internal_transition_table; |
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| 72 | typedef ::boost::fusion::vector<> internal_transition_table11; |
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| 73 | typedef ::boost::fusion::vector<> transition_table; |
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| 74 | }; |
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| 75 | |
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| 76 | }}}} |
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| 77 | |
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| 78 | #endif //BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H |
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| 79 | |
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| 80 | |
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