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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>
- // 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;
- }
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