| // Copyright 2010 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) |
| |
| #include <vector> |
| #include <iostream> |
| |
| #include <boost/msm/back/state_machine.hpp> |
| #include <boost/msm/front/euml/euml.hpp> |
| |
| using namespace std; |
| using namespace boost::msm::front::euml; |
| namespace msm = boost::msm; |
| |
| // how long the timer will ring when countdown elapsed. |
| #define RINGING_TIME 5 |
| |
| namespace // Concrete FSM implementation |
| { |
| // events |
| BOOST_MSM_EUML_DECLARE_ATTRIBUTE(int,m_timer) |
| BOOST_MSM_EUML_ATTRIBUTES((attributes_ << m_timer ), start_timer_attr) |
| BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(start_timer,start_timer_attr) |
| |
| BOOST_MSM_EUML_EVENT(stop_timer) |
| |
| BOOST_MSM_EUML_DECLARE_ATTRIBUTE(int,m_tick) |
| BOOST_MSM_EUML_ATTRIBUTES((attributes_ << m_tick ), tick_attr) |
| BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(tick,tick_attr) |
| |
| BOOST_MSM_EUML_EVENT(start_ringing) |
| |
| // Concrete FSM implementation |
| |
| // The list of FSM states |
| BOOST_MSM_EUML_ACTION(Stopped_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: Stopped" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_STATE(( Stopped_Entry ),Stopped) |
| |
| BOOST_MSM_EUML_ACTION(Started_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: Started" << std::endl; |
| } |
| }; |
| |
| BOOST_MSM_EUML_DECLARE_ATTRIBUTE(int,m_counter) |
| BOOST_MSM_EUML_STATE(( Started_Entry, |
| no_action, |
| attributes_ << m_counter |
| ), |
| Started) |
| |
| BOOST_MSM_EUML_ACTION(Ringing_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: Ringing" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_DECLARE_ATTRIBUTE(int,m_ringing_cpt) |
| BOOST_MSM_EUML_STATE(( Ringing_Entry, |
| no_action, |
| attributes_ << m_ringing_cpt |
| ), |
| Ringing) |
| |
| // external function |
| void do_ring(int ringing_time) {std::cout << "ringing " << ringing_time << " s" << std::endl;} |
| // create functor and eUML function |
| BOOST_MSM_EUML_FUNCTION(Ring_ , do_ring , ring_ , void , void ) |
| |
| // replaces the old transition table |
| BOOST_MSM_EUML_TRANSITION_TABLE(( |
| // +------------------------------------------------------------------------------+ |
| // When we start the countdown, the countdown value is not hardcoded but contained in the start_timer event. |
| // We copy this value into Started |
| Started == Stopped + start_timer /(target_(m_counter)= event_(m_timer)) , |
| Stopped == Started + stop_timer , |
| // internal transition |
| Started + tick |
| // we here use the message queue to move to Started when the countdown is finished |
| // to do this we put start_ringing into the message queue |
| / if_then_( (source_(m_counter) -= event_(m_tick) ) <= Int_<0>(), |
| process_(start_ringing) ) , |
| // when we start ringing, we give to the state its hard-coded ringing time. |
| Ringing == Started + start_ringing |
| / (target_(m_ringing_cpt) = Int_<RINGING_TIME>(), |
| // call the external do_ring function |
| ring_(Int_<RINGING_TIME>())) , |
| // to change a bit, we now do not use the message queue but a transition conflict to solve the same problem. |
| // When tick is fired, we have an internal transition Ringing -> Ringing, as long as Counter > 0 |
| Ringing + tick [ source_(m_ringing_cpt) - event_(m_tick) > Int_<0>() ] |
| /(target_(m_ringing_cpt) -= event_(m_tick) ) , |
| // And we move to Stopped when the counter is 0 |
| Stopped == Ringing + tick[source_(m_ringing_cpt)-event_(m_tick) <= Int_<0>()] , |
| // we let the user manually stop the ringing by pressing any button |
| Stopped == Ringing + stop_timer , |
| Stopped == Ringing + start_timer |
| // +------------------------------------------------------------------------------+ |
| ),transition_table) |
| |
| // create a state machine "on the fly" |
| BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( transition_table, //STT |
| init_ << Stopped // Init State |
| ), |
| SimpleTimer_) //fsm name |
| |
| // choice of back-end |
| typedef msm::back::state_machine<SimpleTimer_> SimpleTimer; |
| |
| // |
| // Testing utilities. |
| // |
| static char const* const state_names[] = { "Stopped", "Started","Ringing" }; |
| void pstate(SimpleTimer const& p) |
| { |
| std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; |
| } |
| |
| void test() |
| { |
| SimpleTimer p; |
| // needed to start the highest-level SM. This will call on_entry and mark the start of the SM |
| p.start(); |
| |
| p.process_event(start_timer(5));pstate(p); //timer set to 5 ticks |
| p.process_event(tick(2));pstate(p); |
| p.process_event(tick(1));pstate(p); |
| p.process_event(tick(1));pstate(p); |
| p.process_event(tick(1));pstate(p); |
| // we are now ringing, let it ring a bit |
| p.process_event(tick(2));pstate(p); |
| p.process_event(tick(1));pstate(p); |
| p.process_event(tick(1));pstate(p); |
| p.process_event(tick(1));pstate(p); |
| } |
| } |
| |
| int main() |
| { |
| test(); |
| return 0; |
| } |