| // 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> |
| // back-end |
| #include <boost/msm/back/state_machine.hpp> |
| //front-end |
| #include <boost/msm/front/state_machine_def.hpp> |
| |
| namespace msm = boost::msm; |
| namespace mpl = boost::mpl; |
| |
| namespace |
| { |
| // events |
| struct event1 {}; |
| struct event2 {}; |
| struct event3 {}; |
| struct event4 {}; |
| struct event5 {}; |
| struct event6 |
| { |
| event6(){} |
| template <class Event> |
| event6(Event const&){} |
| }; |
| // front-end: define the FSM structure |
| struct Fsm_ : public msm::front::state_machine_def<Fsm_> |
| { |
| // The list of FSM states |
| struct State1 : 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: State1" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: State1" << std::endl;} |
| }; |
| struct State2 : 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: State2" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: State2" << std::endl;} |
| }; |
| struct SubFsm2_ : public msm::front::state_machine_def<SubFsm2_> |
| { |
| typedef msm::back::state_machine<SubFsm2_> SubFsm2; |
| |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2" << std::endl;} |
| |
| struct SubState1 : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::SubState1" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::SubState1" << std::endl;} |
| }; |
| struct SubState1b : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::SubState1b" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::SubState1b" << std::endl;} |
| }; |
| struct SubState2 : public msm::front::state<> , public msm::front::explicit_entry<0> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::SubState2" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::SubState2" << std::endl;} |
| }; |
| struct SubState2b : public msm::front::state<> , public msm::front::explicit_entry<1> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::SubState2b" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::SubState2b" << std::endl;} |
| }; |
| // test with a pseudo entry |
| struct PseudoEntry1 : public msm::front::entry_pseudo_state<0> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::PseudoEntry1" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::PseudoEntry1" << std::endl;} |
| }; |
| struct SubState3 : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::SubState3" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::SubState3" << std::endl;} |
| }; |
| struct SubState3b : public msm::front::state<> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::SubState3b" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::SubState3b" << std::endl;} |
| }; |
| struct PseudoExit1 : public msm::front::exit_pseudo_state<event6> |
| { |
| template <class Event,class FSM> |
| void on_entry(Event const&,FSM& ) {std::cout << "entering: SubFsm2::PseudoExit1" << std::endl;} |
| template <class Event,class FSM> |
| void on_exit(Event const&,FSM& ) {std::cout << "leaving: SubFsm2::PseudoExit1" << std::endl;} |
| }; |
| // action methods |
| void entry_action(event4 const&) |
| { |
| std::cout << "calling entry_action" << std::endl; |
| } |
| // the initial state. Must be defined |
| typedef mpl::vector<SubState1,SubState1b> initial_state; |
| |
| typedef mpl::vector<SubState2b> explicit_creation; |
| |
| // Transition table for SubFsm2 |
| struct transition_table : mpl::vector< |
| // Start Event Next Action Guard |
| // +--------------+-------------+------------+------------------------+----------------------+ |
| a_row < PseudoEntry1 , event4 , SubState3 ,&SubFsm2_::entry_action >, |
| _row < SubState2 , event6 , SubState1 >, |
| _row < SubState3 , event5 , PseudoExit1 > |
| // +--------------+-------------+------------+------------------------+----------------------+ |
| > {}; |
| // 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 msm::back::state_machine<SubFsm2_> SubFsm2; |
| |
| // the initial state of the player SM. Must be defined |
| typedef State1 initial_state; |
| |
| // transition actions |
| // guard conditions |
| |
| // Transition table for Fsm |
| struct transition_table : mpl::vector< |
| // Start Event Next Action Guard |
| // +---------------------+--------+------------------------------------+-------+--------+ |
| _row < State1 , event1 , SubFsm2 >, |
| _row < State1 , event2 , SubFsm2::direct<SubFsm2_::SubState2> >, |
| _row < State1 , event3 , mpl::vector<SubFsm2::direct<SubFsm2_::SubState2>, |
| SubFsm2::direct<SubFsm2_::SubState2b> > >, |
| _row < State1 , event4 , SubFsm2::entry_pt |
| <SubFsm2_::PseudoEntry1> >, |
| // +---------------------+--------+------------------------------------+-------+--------+ |
| _row < SubFsm2 , event1 , State1 >, |
| _row < SubFsm2::exit_pt |
| <SubFsm2_::PseudoExit1>, event6 , State2 > |
| // +---------------------+--------+------------------------------------+-------+--------+ |
| > {}; |
| |
| // 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 msm::back::state_machine<Fsm_> Fsm; |
| |
| // |
| // Testing utilities. |
| // |
| static char const* const state_names[] = { "State1", "SubFsm2","State2" }; |
| void pstate(Fsm const& p) |
| { |
| std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; |
| } |
| |
| void test() |
| { |
| Fsm p; |
| // needed to start the highest-level SM. This will call on_entry and mark the start of the SM |
| p.start(); |
| std::cout << "Simply move in and out of the composite, activate init states" << std::endl; |
| p.process_event(event1()); pstate(p); |
| p.process_event(event1()); pstate(p); |
| std::cout << "Direct entry into SubFsm2::SubState2, then transition to SubState1 and back to State1" << std::endl; |
| p.process_event(event2()); pstate(p); |
| p.process_event(event6()); pstate(p); |
| p.process_event(event1()); pstate(p); |
| std::cout << "processing fork to SubFsm2::SubState2 and SubFsm2::SubState2b" << std::endl; |
| p.process_event(event3()); pstate(p); |
| p.process_event(event1()); pstate(p); |
| std::cout << "processing entry pseudo state" << std::endl; |
| p.process_event(event4()); pstate(p); |
| p.process_event(event1()); pstate(p); |
| std::cout << "processing entry + exit pseudo state" << std::endl; |
| p.process_event(event4()); pstate(p); |
| std::cout << "using exit pseudo state" << std::endl; |
| p.process_event(event5()); pstate(p); |
| } |
| } |
| |
| int main() |
| { |
| test(); |
| return 0; |
| } |