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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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