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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 <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;
- }
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