[Boost-commit] svn:boost r59008 - sandbox/msm/libs/msm/doc

Subject: [Boost-commit] svn:boost r59008 - sandbox/msm/libs/msm/doc
From: christophe.j.henry_at_[hidden]
Date: 2010-01-14 15:05:57

Author: chenry
Date: 2010-01-14 15:05:57 EST (Thu, 14 Jan 2010)
New Revision: 59008
URL: http://svn.boost.org/trac/boost/changeset/59008

Log:
added 3 examples with internal transitions
Added:
   sandbox/msm/libs/msm/doc/SimpleTutorialInternal.cpp   (contents, props changed)
   sandbox/msm/libs/msm/doc/SimpleTutorialInternal2.cpp   (contents, props changed)
   sandbox/msm/libs/msm/doc/TestInternal.cpp   (contents, props changed)

Added: sandbox/msm/libs/msm/doc/SimpleTutorialInternal.cpp
==============================================================================
--- (empty file)
+++ sandbox/msm/libs/msm/doc/SimpleTutorialInternal.cpp	2010-01-14 15:05:57 EST (Thu, 14 Jan 2010)
@@ -0,0 +1,213 @@
+#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>
+
+namespace msm = boost::msm;
+using namespace msm::front;
+
+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 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;}
+        };
+
+        // sm_ptr still supported but deprecated as functors are a much better way to do the same thing
+        struct Stopped : public msm::front::state<msm::front::default_base_state,msm::front::sm_ptr> 
+        {	 
+            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;}
+            void set_sm_ptr(player_* pl)
+            {
+                m_player=pl;
+            }
+            player_* m_player;
+        };
+
+        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
+        void start_playback(play const&)       { std::cout << "player::start_playback\n"; }
+        void open_drawer(open_close const&)    { std::cout << "player::open_drawer\n"; }
+        void close_drawer(open_close const&)   { std::cout << "player::close_drawer\n"; }
+        void store_cd_info(cd_detected const&) { std::cout << "player::store_cd_info\n"; }
+        void stop_playback(stop const&)        { std::cout << "player::stop_playback\n"; }
+        void pause_playback(pause const&)      { std::cout << "player::pause_playback\n"; }
+        void resume_playback(end_pause const&)      { std::cout << "player::resume_playback\n"; }
+        void stop_and_open(open_close const&)  { std::cout << "player::stop_and_open\n"; }
+        void stopped_again(stop const&)	       {std::cout << "player::stopped_again\n";}
+        // guard conditions
+        bool good_disk_format(cd_detected const& evt)
+        {
+            // 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;
+        }
+        // transitions internal to Empty
+        void internal_action(cd_detected const&){ std::cout << "Empty::internal action\n"; }
+        bool internal_guard(cd_detected const&)
+        {
+            std::cout << "Empty::internal guard\n";
+            return false;
+        }
+        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 guard functor\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 action functor" << std::endl;
+            }
+        };
+
+        typedef player_ p; // makes transition table cleaner
+
+        // Transition table for player
+        struct transition_table : mpl::vector<
+            //    Start     Event         Next      Action				 Guard
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Stopped , play        , Playing , &p::start_playback                         >,
+          a_row < Stopped , open_close  , Open    , &p::open_drawer                            >,
+           _row < Stopped , stop        , Stopped                                              >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Open    , open_close  , Empty   , &p::close_drawer                           >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Empty   , open_close  , Open    , &p::open_drawer                            >,
+            row < Empty   , cd_detected , Stopped , &p::store_cd_info   ,&p::good_disk_format  >,
+           irow < Empty   , cd_detected ,           &p::internal_action ,&p::internal_guard    >,
+         g_irow < Empty   , cd_detected                                 ,&p::internal_guard    >,
+            Row < Empty   , cd_detected , none    , internal_action_fct ,internal_guard_fct    >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Playing , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Playing , pause       , Paused  , &p::pause_playback                         >,
+          a_row < Playing , open_close  , Open    , &p::stop_and_open                          >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Paused  , end_pause   , Playing , &p::resume_playback                        >,
+          a_row < Paused  , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Paused  , open_close  , Open    , &p::stop_and_open                          >
+            //  +---------+-------------+---------+---------------------+----------------------+
+        > {};
+        // 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;
+        }
+        typedef int no_message_queue;
+
+    };
+    // 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);
+		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;
+}

Added: sandbox/msm/libs/msm/doc/SimpleTutorialInternal2.cpp
==============================================================================
--- (empty file)
+++ sandbox/msm/libs/msm/doc/SimpleTutorialInternal2.cpp	2010-01-14 15:05:57 EST (Thu, 14 Jan 2010)
@@ -0,0 +1,221 @@
+#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>
+
+namespace msm = boost::msm;
+using namespace msm::front;
+
+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_>
+    {
+        // transitions internal to Empty
+        void internal_action(cd_detected const&){ std::cout << "Empty::internal action\n"; }
+        bool internal_guard(cd_detected const&)
+        {
+            std::cout << "Empty::internal guard\n";
+            return false;
+        }
+        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 guard functor\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 action functor" << std::endl;
+            }
+        };
+
+        // 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;}
+
+            // 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;}
+        };
+
+        // sm_ptr still supported but deprecated as functors are a much better way to do the same thing
+        struct Stopped : public msm::front::state<msm::front::default_base_state,msm::front::sm_ptr> 
+        {	 
+            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;}
+            void set_sm_ptr(player_* pl)
+            {
+                m_player=pl;
+            }
+            player_* m_player;
+        };
+
+        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
+        void start_playback(play const&)       { std::cout << "player::start_playback\n"; }
+        void open_drawer(open_close const&)    { std::cout << "player::open_drawer\n"; }
+        void close_drawer(open_close const&)   { std::cout << "player::close_drawer\n"; }
+        void store_cd_info(cd_detected const&) { std::cout << "player::store_cd_info\n"; }
+        void stop_playback(stop const&)        { std::cout << "player::stop_playback\n"; }
+        void pause_playback(pause const&)      { std::cout << "player::pause_playback\n"; }
+        void resume_playback(end_pause const&)      { std::cout << "player::resume_playback\n"; }
+        void stop_and_open(open_close const&)  { std::cout << "player::stop_and_open\n"; }
+        void stopped_again(stop const&)	       {std::cout << "player::stopped_again\n";}
+        // guard conditions
+        bool good_disk_format(cd_detected const& evt)
+        {
+            // 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;
+        }
+
+        typedef player_ p; // makes transition table cleaner
+
+        // Transition table for player
+        struct transition_table : mpl::vector<
+            //    Start     Event         Next      Action				 Guard
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Stopped , play        , Playing , &p::start_playback                         >,
+          a_row < Stopped , open_close  , Open    , &p::open_drawer                            >,
+           _row < Stopped , stop        , Stopped                                              >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Open    , open_close  , Empty   , &p::close_drawer                           >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Empty   , open_close  , Open    , &p::open_drawer                            >,
+          // conflict between a normal and 2 internal transitions (irow/g_irow)
+            row < Empty   , cd_detected , Stopped , &p::store_cd_info   ,&p::good_disk_format  >,
+           irow < Empty   , cd_detected ,           &p::internal_action ,&p::internal_guard    >,
+         g_irow < Empty   , cd_detected                                 ,&p::internal_guard    >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Playing , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Playing , pause       , Paused  , &p::pause_playback                         >,
+          a_row < Playing , open_close  , Open    , &p::stop_and_open                          >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Paused  , end_pause   , Playing , &p::resume_playback                        >,
+          a_row < Paused  , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Paused  , open_close  , Open    , &p::stop_and_open                          >
+            //  +---------+-------------+---------+---------------------+----------------------+
+        > {};
+        // 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;
+        }
+        typedef int no_message_queue;
+
+    };
+    // 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);
+		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;
+}

Added: sandbox/msm/libs/msm/doc/TestInternal.cpp
==============================================================================
--- (empty file)
+++ sandbox/msm/libs/msm/doc/TestInternal.cpp	2010-01-14 15:05:57 EST (Thu, 14 Jan 2010)
@@ -0,0 +1,313 @@
+#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>
+
+namespace msm = boost::msm;
+using namespace msm::front;
+
+namespace
+{
+    // events
+    struct play {};
+    struct end_pause {};
+    struct stop {};
+    struct pause {};
+    struct internal_event {};
+    struct open_close {};
+    struct NextSong {};
+    struct PreviousSong {};
+
+    // 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_>
+    {
+        // transitions internal to Empty
+        void internal_action(cd_detected const&){ std::cout << "Empty::internal action\n"; }
+        bool internal_guard(cd_detected const&)
+        {
+            std::cout << "Empty::internal guard\n";
+            return false;
+        }
+        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 guard functor\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 action functor" << std::endl;
+            }
+        };
+
+        // 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;}
+
+            // Transition table for Empty
+            struct internal_transition_table : mpl::vector<
+                //    Start     Event         Next      Action				 Guard
+                Row < Empty   , cd_detected , none    , internal_action_fct ,internal_guard_fct    >,
+           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<msm::front::default_base_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_machine_def<Playing_>
+        {
+            // when playing, the CD is loaded and we are in either pause or playing (duh)
+            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;}
+
+            // The list of FSM states
+            struct Song1 : public msm::front::state<>
+            {
+                template <class Event,class FSM>
+                void on_entry(Event const&,FSM& ) {std::cout << "starting: First song" << std::endl;}
+                template <class Event,class FSM>
+                void on_exit(Event const&,FSM& ) {std::cout << "finishing: First Song" << std::endl;}
+
+            };
+            struct Song2 : public msm::front::state<>
+            {	 
+                template <class Event,class FSM>
+                void on_entry(Event const&,FSM& ) {std::cout << "starting: Second song" << std::endl;}
+                template <class Event,class FSM>
+                void on_exit(Event const&,FSM& ) {std::cout << "finishing: Second Song" << std::endl;}
+            };
+            struct Song3 : public msm::front::state<>
+            {	 
+                template <class Event,class FSM>
+                void on_entry(Event const&,FSM& ) {std::cout << "starting: Third song" << std::endl;}
+                template <class Event,class FSM>
+                void on_exit(Event const&,FSM& ) {std::cout << "finishing: Third Song" << std::endl;}
+            };
+            // the initial state. Must be defined
+            typedef Song1 initial_state;
+            // transition actions
+            void start_next_song(NextSong const&){std::cout << "Playing: start_next_song" << std::endl;}
+            void start_prev_song(PreviousSong const&){std::cout << "Playing: start_prev_song" << std::endl;}
+            // guard conditions
+            struct playing_internal_guard 
+            {
+                template <class EVT,class FSM,class SourceState,class TargetState>
+                bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
+                {
+                    std::cout << "Playing::internal guard\n";
+                    return true;
+                }
+            };
+            struct playing_false_guard 
+            {
+                template <class EVT,class FSM,class SourceState,class TargetState>
+                bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
+                {
+                    std::cout << "Playing::false guard\n";
+                    return false;
+                }
+            };
+            struct playing_internal_fct 
+            {
+                template <class EVT,class FSM,class SourceState,class TargetState>
+                void operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
+                {
+                    std::cout << "Playing::internal fct\n";
+                }
+            };
+            typedef Playing_ pl; // makes transition table cleaner
+            // Transition table for Playing
+            struct transition_table : mpl::vector4<
+                //      Start     Event          Next      Action				 Guard
+                //    +---------+---------------+---------+---------------------+----------------------+
+                a_row < Song1   , NextSong      , Song2   , &pl::start_next_song                       >,
+                a_row < Song2   , PreviousSong  , Song1   , &pl::start_prev_song                       >,
+                a_row < Song2   , NextSong      , Song3   , &pl::start_next_song                       >,
+                a_row < Song3   , PreviousSong  , Song2   , &pl::start_prev_song                       >
+                //    +---------+-------------+---------+---------------------+----------------------+
+            > {};
+            // Internal transition table for Playing
+                //  +---------+----------------+---------+---------------------+-----------------------+
+            struct internal_transition_table : mpl::vector<
+                // normal internal transition
+                //    Start     Event            Next      Action				 Guard
+             Internal <         internal_event           , playing_internal_fct,playing_internal_guard >,
+                // conflict between internal and the external defined above
+             Internal <         PreviousSong             , playing_internal_fct,playing_false_guard    >
+                //  +---------+----------------+---------+---------------------+-----------------------+
+            > {};        
+
+            // 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;
+            }
+        };
+        // back-end
+        typedef msm::back::state_machine<Playing_> Playing;
+
+        // 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
+        void start_playback(play const&)       { std::cout << "player::start_playback\n"; }
+        void open_drawer(open_close const&)    { std::cout << "player::open_drawer\n"; }
+        void close_drawer(open_close const&)   { std::cout << "player::close_drawer\n"; }
+        void store_cd_info(cd_detected const&) { std::cout << "player::store_cd_info\n"; }
+        void stop_playback(stop const&)        { std::cout << "player::stop_playback\n"; }
+        void pause_playback(pause const&)      { std::cout << "player::pause_playback\n"; }
+        void resume_playback(end_pause const&)      { std::cout << "player::resume_playback\n"; }
+        void stop_and_open(open_close const&)  { std::cout << "player::stop_and_open\n"; }
+        void stopped_again(stop const&)	       {std::cout << "player::stopped_again\n";}
+        // guard conditions
+        bool good_disk_format(cd_detected const& evt)
+        {
+            // 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;
+        }
+
+        typedef player_ p; // makes transition table cleaner
+
+        // Transition table for player
+        struct transition_table : mpl::vector<
+            //    Start     Event         Next      Action				 Guard
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Stopped , play        , Playing , &p::start_playback                         >,
+          a_row < Stopped , open_close  , Open    , &p::open_drawer                            >,
+           _row < Stopped , stop        , Stopped                                              >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Open    , open_close  , Empty   , &p::close_drawer                           >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Empty   , open_close  , Open    , &p::open_drawer                            >,
+          // conflict between a normal and 2 internal transitions (irow/g_irow) 
+          // + a state-defined internals defined 2 ways (see Empty)
+            row < Empty   , cd_detected , Stopped , &p::store_cd_info   ,&p::good_disk_format  >,
+           irow < Empty   , cd_detected ,           &p::internal_action ,&p::internal_guard    >,
+         g_irow < Empty   , cd_detected                                 ,&p::internal_guard    >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Playing , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Playing , pause       , Paused  , &p::pause_playback                         >,
+          a_row < Playing , open_close  , Open    , &p::stop_and_open                          >,
+            //  +---------+-------------+---------+---------------------+----------------------+
+          a_row < Paused  , end_pause   , Playing , &p::resume_playback                        >,
+          a_row < Paused  , stop        , Stopped , &p::stop_playback                          >,
+          a_row < Paused  , open_close  , Open    , &p::stop_and_open                          >
+            //  +---------+-------------+---------+---------------------+----------------------+
+        > {};
+        // 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;
+        }
+        typedef int no_message_queue;
+
+    };
+    // 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);
+		p.process_event(play());
+        p.process_event(NextSong());
+        std::cout << "sending an internal event" << std::endl;
+		p.process_event(internal_event());
+        std::cout << "conflict between the internal and normal transition. Internal is tried first" << std::endl;
+        p.process_event(PreviousSong());
+
+        // 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;
+}