| // 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> |
| #include <boost/msm/front/euml/euml.hpp> |
| |
| namespace msm = boost::msm; |
| using namespace boost::msm::front::euml; |
| |
| namespace |
| { |
| // events |
| BOOST_MSM_EUML_EVENT(event1) |
| |
| BOOST_MSM_EUML_ACTION(State1_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: State1" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State1_Exit) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "leaving: State1" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State2_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: State2" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State2_Exit) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "leaving: State2" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State3_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: State3" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State3_Exit) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "leaving: State3" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State4_Entry) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "entering: State4" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State4_Exit) |
| { |
| template <class Event,class FSM,class STATE> |
| void operator()(Event const&,FSM&,STATE& ) |
| { |
| std::cout << "leaving: State4" << std::endl; |
| } |
| }; |
| |
| // The list of FSM states |
| BOOST_MSM_EUML_STATE(( State1_Entry,State1_Exit ),State1) |
| BOOST_MSM_EUML_STATE(( State2_Entry,State2_Exit ),State2) |
| BOOST_MSM_EUML_STATE(( State3_Entry,State3_Exit ),State3) |
| BOOST_MSM_EUML_STATE(( State4_Entry,State4_Exit ),State4) |
| |
| // transition actions |
| BOOST_MSM_EUML_ACTION(State2ToState3) |
| { |
| template <class FSM,class EVT,class SourceState,class TargetState> |
| void operator()(EVT const& ,FSM&,SourceState& ,TargetState& ) |
| { |
| std::cout << "my_machine::State2ToState3" << std::endl; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(State3ToState4) |
| { |
| template <class FSM,class EVT,class SourceState,class TargetState> |
| void operator()(EVT const& ,FSM&,SourceState& ,TargetState& ) |
| { |
| std::cout << "my_machine::State3ToState4" << std::endl; |
| } |
| }; |
| // guard conditions |
| BOOST_MSM_EUML_ACTION(always_true) |
| { |
| template <class FSM,class EVT,class SourceState,class TargetState> |
| bool operator()(EVT const& evt,FSM&,SourceState& ,TargetState& ) |
| { |
| std::cout << "always_true" << std::endl; |
| return true; |
| } |
| }; |
| BOOST_MSM_EUML_ACTION(always_false) |
| { |
| template <class FSM,class EVT,class SourceState,class TargetState> |
| bool operator()(EVT const& evt,FSM&,SourceState& ,TargetState& ) |
| { |
| std::cout << "always_false" << std::endl; |
| return false; |
| } |
| }; |
| // replaces the old transition table |
| BOOST_MSM_EUML_TRANSITION_TABLE(( |
| State2 == State1 , |
| State3 == State2 / State2ToState3, |
| State4 == State3 [always_true] / State3ToState4, |
| State4 == State3 [always_false], |
| State1 == State4 + event1 |
| // +------------------------------------------------------------------------------+ |
| ),transition_table) |
| |
| // create a state machine "on the fly" |
| BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( transition_table, //STT |
| init_ << State1 // Init State |
| ), |
| my_machine_) //fsm name |
| |
| // Pick a back-end |
| typedef msm::back::state_machine<my_machine_> my_machine; |
| |
| // |
| // Testing utilities. |
| // |
| static char const* const state_names[] = { "State1", "State2", "State3", "State4" }; |
| void pstate(my_machine const& p) |
| { |
| std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; |
| } |
| |
| void test() |
| { |
| my_machine p; |
| |
| // needed to start the highest-level SM. This will call on_entry and mark the start of the SM |
| // in this case it will also immediately trigger all anonymous transitions |
| p.start(); |
| // this event will bring us back to the initial state and thus, a new "loop" will be started |
| p.process_event(event1); |
| } |
| } |
| |
| int main() |
| { |
| test(); |
| return 0; |
| } |