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- // 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;
- }
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