| // Copyright 2008 Christophe Henry |
| // henry UNDERSCORE christophe AT hotmail DOT com |
| // This is an extended version of the state machine available in the boost::mpl library |
| // Distributed under the same license as the original. |
| // Copyright for the original version: |
| // Copyright 2005 David Abrahams and Aleksey Gurtovoy. 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) |
| |
| #ifndef BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H |
| #define BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H |
| |
| #include <boost/mpl/int.hpp> |
| |
| #include <boost/mpl/vector.hpp> |
| #include <boost/fusion/container/map.hpp> |
| #include <boost/fusion/include/at_key.hpp> |
| #include <boost/type_traits/add_const.hpp> |
| |
| namespace boost { namespace msm { namespace front {namespace detail |
| { |
| template <class Attributes= ::boost::fusion::map<> > |
| struct inherit_attributes |
| { |
| inherit_attributes():m_attributes(){} |
| inherit_attributes(Attributes const& the_attributes):m_attributes(the_attributes){} |
| // on the fly attribute creation capability |
| typedef Attributes attributes_type; |
| template <class Index> |
| typename ::boost::fusion::result_of::at_key<attributes_type, |
| Index>::type |
| get_attribute(Index const&) |
| { |
| return ::boost::fusion::at_key<Index>(m_attributes); |
| } |
| |
| template <class Index> |
| typename ::boost::add_const< |
| typename ::boost::fusion::result_of::at_key<attributes_type, |
| Index>::type>::type |
| get_attribute(Index const&)const |
| { |
| return const_cast< |
| typename ::boost::add_const< |
| typename ::boost::fusion::result_of::at_key< attributes_type, |
| Index >::type>::type> |
| (::boost::fusion::at_key<Index>(m_attributes)); |
| } |
| |
| private: |
| // attributes |
| Attributes m_attributes; |
| }; |
| |
| // the interface for all states. Defines entry and exit functions. Overwrite to implement for any state needing it. |
| template<class USERBASE,class Attributes= ::boost::fusion::map<> > |
| struct state_base : public inherit_attributes<Attributes>, USERBASE |
| { |
| typedef USERBASE user_state_base; |
| typedef Attributes attributes_type; |
| |
| // empty implementation for the states not wishing to define an entry condition |
| // will not be called polymorphic way |
| template <class Event,class FSM> |
| void on_entry(Event const& ,FSM&){} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ){} |
| // default (empty) transition table; |
| typedef ::boost::mpl::vector0<> internal_transition_table; |
| typedef ::boost::mpl::vector0<> transition_table; |
| }; |
| |
| }}}} |
| |
| #endif //BOOST_MSM_FRONT_DETAILS_COMMON_STATES_H |
| |