| // 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> |
| #define BOOST_TEST_MODULE MyTest |
| #include <boost/test/unit_test.hpp> |
| |
| namespace msm = boost::msm; |
| namespace mpl = boost::mpl; |
| |
| 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; |
| }; |
| struct SomeExternalContext |
| { |
| SomeExternalContext(int b):bla(b){} |
| int bla; |
| }; |
| // front-end: define the FSM structure |
| struct player_ : public msm::front::state_machine_def<player_> |
| { |
| player_(SomeExternalContext& context,int someint): |
| context_(context), |
| someint_(someint) |
| {} |
| |
| SomeExternalContext& context_; |
| int someint_; |
| |
| // The list of FSM states |
| struct Empty : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {++entry_counter;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {++exit_counter;} |
| int entry_counter; |
| int exit_counter; |
| }; |
| struct Open : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {++entry_counter;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {++exit_counter;} |
| int entry_counter; |
| int exit_counter; |
| }; |
| |
| // sm_ptr still supported but deprecated as functors are a much better way to do the same thing |
| struct Stopped : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {++entry_counter;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {++exit_counter;} |
| int entry_counter; |
| int exit_counter; |
| }; |
| |
| struct Playing : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {++entry_counter;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {++exit_counter;} |
| int entry_counter; |
| int exit_counter; |
| }; |
| |
| // state not defining any entry or exit |
| struct Paused : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {++entry_counter;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {++exit_counter;} |
| int entry_counter; |
| int exit_counter; |
| }; |
| |
| // the initial state of the player SM. Must be defined |
| typedef Empty initial_state; |
| |
| // transition actions |
| void start_playback(play const&) {} |
| void open_drawer(open_close const&) { } |
| void store_cd_info(cd_detected const&) { } |
| void stop_playback(stop const&) { } |
| void pause_playback(pause const&) { } |
| void resume_playback(end_pause const&) { } |
| void stop_and_open(open_close const&) { } |
| void stopped_again(stop const&){} |
| // 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) |
| { |
| return false; |
| } |
| return true; |
| } |
| bool can_close_drawer(open_close const&) |
| { |
| 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 >, |
| // +---------+-------------+---------+---------------------+----------------------+ |
| g_row < Open , open_close , Empty , &p::can_close_drawer >, |
| // +---------+-------------+---------+---------------------+----------------------+ |
| a_row < Empty , open_close , Open , &p::open_drawer >, |
| row < Empty , cd_detected , Stopped , &p::store_cd_info ,&p::good_disk_format >, |
| // +---------+-------------+---------+---------------------+----------------------+ |
| 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&, FSM&,int) |
| { |
| BOOST_FAIL("no_transition called!"); |
| } |
| // init counters |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& fsm) |
| { |
| fsm.template get_state<player_::Stopped&>().entry_counter=0; |
| fsm.template get_state<player_::Stopped&>().exit_counter=0; |
| fsm.template get_state<player_::Open&>().entry_counter=0; |
| fsm.template get_state<player_::Open&>().exit_counter=0; |
| fsm.template get_state<player_::Empty&>().entry_counter=0; |
| fsm.template get_state<player_::Empty&>().exit_counter=0; |
| fsm.template get_state<player_::Playing&>().entry_counter=0; |
| fsm.template get_state<player_::Playing&>().exit_counter=0; |
| fsm.template get_state<player_::Paused&>().entry_counter=0; |
| fsm.template get_state<player_::Paused&>().exit_counter=0; |
| fsm.context_ = 20; |
| } |
| |
| }; |
| // Pick a back-end |
| typedef msm::back::state_machine<player_> player; |
| |
| // static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" }; |
| |
| |
| BOOST_AUTO_TEST_CASE( my_test ) |
| { |
| SomeExternalContext ctx(3); |
| player p(boost::ref(ctx),5); |
| BOOST_CHECK_MESSAGE(p.context_.bla == 3,"wrong value passed"); |
| BOOST_CHECK_MESSAGE(p.someint_ == 5,"wrong value passed"); |
| ctx.bla = 10; |
| BOOST_CHECK_MESSAGE(p.context_.bla == 10,"error with reference"); |
| p.start(); |
| BOOST_CHECK_MESSAGE(p.context_.bla == 20,"error with fsm entry behavior"); |
| } |
| } |
| |