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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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