projects / ceph.git / blame
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1 | // Copyright 2008 Christophe Henry |
| 2 | // henry UNDERSCORE christophe AT hotmail DOT com | |
| 3 | // This is an extended version of the state machine available in the boost::mpl library | |
| 4 | // Distributed under the same license as the original. | |
| 5 | // Copyright for the original version: | |
| 6 | // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed | |
| 7 | // under the Boost Software License, Version 1.0. (See accompanying | |
| 8 | // file LICENSE_1_0.txt or copy at | |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 10 | ||
| 11 | #ifndef BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H | |
| 12 | #define BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H | |
| 13 | ||
| 14 | #include <boost/mpl/int.hpp> | |
| 15 | ||
| 16 | #include <boost/mpl/vector.hpp> | |
| 17 | #include <boost/fusion/container/map.hpp> | |
| 18 | #include <boost/fusion/include/at_key.hpp> | |
| 19 | #include <boost/type_traits/add_const.hpp> | |
| 20 | ||
| 21 | namespace boost { namespace msm { namespace front {namespace detail | |
| 22 | { | |
| 23 | template <class Attributes= ::boost::fusion::map<> > | |
| 24 | struct inherit_attributes | |
| 25 | { | |
| 26 | inherit_attributes():m_attributes(){} | |
| 27 | inherit_attributes(Attributes const& the_attributes):m_attributes(the_attributes){} | |
| 28 | // on the fly attribute creation capability | |
| 29 | typedef Attributes attributes_type; | |
| 30 | template <class Index> | |
| 31 | typename ::boost::fusion::result_of::at_key<attributes_type, | |
| 32 | Index>::type | |
| 33 | get_attribute(Index const&) | |
| 34 | { | |
| 35 | return ::boost::fusion::at_key<Index>(m_attributes); | |
| 36 | } | |
| 37 | ||
| 38 | template <class Index> | |
| 39 | typename ::boost::add_const< | |
| 40 | typename ::boost::fusion::result_of::at_key<attributes_type, | |
| 41 | Index>::type>::type | |
| 42 | get_attribute(Index const&)const | |
| 43 | { | |
| 44 | return const_cast< | |
| 45 | typename ::boost::add_const< | |
| 46 | typename ::boost::fusion::result_of::at_key< attributes_type, | |
| 47 | Index >::type>::type> | |
| 48 | (::boost::fusion::at_key<Index>(m_attributes)); | |
| 49 | } | |
| 50 | ||
| 51 | private: | |
| 52 | // attributes | |
| 53 | Attributes m_attributes; | |
| 54 | }; | |
| 55 | ||
| 56 | // the interface for all states. Defines entry and exit functions. Overwrite to implement for any state needing it. | |
| 57 | template<class USERBASE,class Attributes= ::boost::fusion::map<> > | |
| 58 | struct state_base : public inherit_attributes<Attributes>, USERBASE | |
| 59 | { | |
| 60 | typedef USERBASE user_state_base; | |
| 61 | typedef Attributes attributes_type; | |
| 62 | ||
| 63 | // empty implementation for the states not wishing to define an entry condition | |
| 64 | // will not be called polymorphic way | |
| 65 | template <class Event,class FSM> | |
| 66 | void on_entry(Event const& ,FSM&){} | |
| 67 | template <class Event,class FSM> | |
| 68 | void on_exit(Event const&,FSM& ){} | |
| 69 | // default (empty) transition table; | |
| 70 | typedef ::boost::mpl::vector0<> internal_transition_table; | |
| 71 | typedef ::boost::mpl::vector0<> transition_table; | |
| 72 | }; | |
| 73 | ||
| 74 | }}}} | |
| 75 | ||
| 76 | #endif //BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H | |
| 77 |