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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 <iostream>
- // back-end
- #include <boost/msm/back/state_machine.hpp>
- //front-end
- #include <boost/msm/front/state_machine_def.hpp>
- #include <boost/msm/front/functor_row.hpp>
- #include <boost/msm/front/euml/common.hpp>
- // for And_ operator
- #include <boost/msm/front/euml/operator.hpp>
- using namespace std;
- namespace msm = boost::msm;
- using namespace msm::front;
- namespace mpl = boost::mpl;
- // for And_ operator
- using namespace msm::front::euml;
- namespace
- {
- // events
- struct play {};
- struct end_pause {};
- struct stop {};
- struct pause {};
- struct open_close {};
- // A "complicated" event type that carries some data.
- enum DiskTypeEnum
- {
- DISK_CD=0,
- DISK_DVD=1
- };
- struct cd_detected
- {
- cd_detected(std::string name, DiskTypeEnum diskType)
- : name(name),
- disc_type(diskType)
- {}
- std::string name;
- DiskTypeEnum disc_type;
- };
- // front-end: define the FSM structure
- struct player_ : public msm::front::state_machine_def<player_>
- {
- // The list of FSM states
- struct Empty : public msm::front::state<>
- {
- // every (optional) entry/exit methods get the event passed.
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {std::cout << "entering: Empty" << std::endl;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {std::cout << "leaving: Empty" << std::endl;}
- struct internal_guard_fct
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
- {
- std::cout << "Empty::internal_transition_table guard\n";
- return false;
- }
- };
- struct internal_action_fct
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- std::cout << "Empty::internal_transition_table action" << std::endl;
- }
- };
- // Transition table for Empty
- struct internal_transition_table : mpl::vector<
- // Start Event Next Action Guard
- Internal < cd_detected , internal_action_fct ,internal_guard_fct >
- // +---------+-------------+---------+---------------------+----------------------+
- > {};
- };
- struct Open : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const& ,FSM&) {std::cout << "entering: Open" << std::endl;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {std::cout << "leaving: Open" << std::endl;}
- };
- struct Stopped : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const& ,FSM&) {std::cout << "entering: Stopped" << std::endl;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {std::cout << "leaving: Stopped" << std::endl;}
- };
- struct Playing : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {std::cout << "entering: Playing" << std::endl;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {std::cout << "leaving: Playing" << std::endl;}
- };
- // state not defining any entry or exit
- struct Paused : public msm::front::state<>
- {
- };
- // the initial state of the player SM. Must be defined
- typedef Empty initial_state;
- // transition actions
- // as the functors are generic on events, fsm and source/target state,
- // you can reuse them in another machine if you wish
- struct TestFct
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const&, FSM&,SourceState& ,TargetState& )
- {
- cout << "transition with event:" << typeid(EVT).name() << endl;
- }
- };
- struct start_playback
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::start_playback" << endl;
- }
- };
- struct open_drawer
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::open_drawer" << endl;
- }
- };
- struct close_drawer
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::close_drawer" << endl;
- }
- };
- struct store_cd_info
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const&,FSM& fsm ,SourceState& ,TargetState& )
- {
- cout << "player::store_cd_info" << endl;
- fsm.process_event(play());
- }
- };
- struct stop_playback
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::stop_playback" << endl;
- }
- };
- struct pause_playback
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::pause_playback" << endl;
- }
- };
- struct resume_playback
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::resume_playback" << endl;
- }
- };
- struct stop_and_open
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::stop_and_open" << endl;
- }
- };
- struct stopped_again
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
- {
- cout << "player::stopped_again" << endl;
- }
- };
- // guard conditions
- struct DummyGuard
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- bool operator()(EVT const& evt,FSM& fsm,SourceState& src,TargetState& tgt)
- {
- return true;
- }
- };
- struct good_disk_format
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
- {
- // to test a guard condition, let's say we understand only CDs, not DVD
- if (evt.disc_type != DISK_CD)
- {
- std::cout << "wrong disk, sorry" << std::endl;
- return false;
- }
- return true;
- }
- };
- struct always_true
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
- {
- return true;
- }
- };
- struct internal_guard
- {
- template <class EVT,class FSM,class SourceState,class TargetState>
- bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
- {
- std::cout << "Empty::internal guard\n";
- return false;
- }
- };
- // Transition table for player
- struct transition_table : mpl::vector<
- // Start Event Next Action Guard
- // +---------+-------------+---------+---------------------------+----------------------+
- Row < Stopped , play , Playing , ActionSequence_
- <mpl::vector<
- TestFct,start_playback> >
- , DummyGuard >,
- Row < Stopped , open_close , Open , open_drawer , none >,
- Row < Stopped , stop , Stopped , none , none >,
- // +---------+-------------+---------+---------------------------+----------------------+
- Row < Open , open_close , Empty , close_drawer , none >,
- // +---------+-------------+---------+---------------------------+----------------------+
- Row < Empty , open_close , Open , open_drawer , none >,
- Row < Empty , cd_detected , Stopped , store_cd_info , And_<good_disk_format,
- always_true> >,
- // internal transition inside the stt: none as Target
- Row < Empty , cd_detected , none , none , internal_guard >,
- // +---------+-------------+---------+---------------------------+----------------------+
- Row < Playing , stop , Stopped , stop_playback , none >,
- Row < Playing , pause , Paused , pause_playback , none >,
- Row < Playing , open_close , Open , stop_and_open , none >,
- // +---------+-------------+---------+---------------------------+----------------------+
- Row < Paused , end_pause , Playing , resume_playback , none >,
- Row < Paused , stop , Stopped , stop_playback , none >,
- Row < Paused , open_close , Open , stop_and_open , none >
- // +---------+-------------+---------+---------------------------+----------------------+
- > {};
- // Replaces the default no-transition response.
- template <class FSM,class Event>
- void no_transition(Event const& e, FSM&,int state)
- {
- std::cout << "no transition from state " << state
- << " on event " << typeid(e).name() << std::endl;
- }
- };
- // Pick a back-end
- typedef msm::back::state_machine<player_> player;
- //
- // Testing utilities.
- //
- static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" };
- void pstate(player const& p)
- {
- std::cout << " -> " << state_names[p.current_state()[0]] << std::endl;
- }
- void test()
- {
- player p;
- // needed to start the highest-level SM. This will call on_entry and mark the start of the SM
- p.start();
- // go to Open, call on_exit on Empty, then action, then on_entry on Open
- p.process_event(open_close()); pstate(p);
- p.process_event(open_close()); pstate(p);
- // will be rejected, wrong disk type
- p.process_event(
- cd_detected("louie, louie",DISK_DVD)); pstate(p);
- p.process_event(
- cd_detected("louie, louie",DISK_CD)); pstate(p);
- // no need to call play() as the previous transition does it in its action method
- //p.process_event(play());
- // at this point, Play is active
- p.process_event(pause()); pstate(p);
- // go back to Playing
- p.process_event(end_pause()); pstate(p);
- p.process_event(pause()); pstate(p);
- p.process_event(stop()); pstate(p);
- // event leading to the same state
- // no action method called as it is not present in the transition table
- p.process_event(stop()); pstate(p);
- }
- }
- int main()
- {
- test();
- return 0;
- }
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