mirror of
https://github.com/boostorg/msm.git
synced 2026-01-24 18:12:19 +00:00
msm added to trunk
[SVN r62129]
This commit is contained in:
Christophe Henry
221
doc/HTML/examples/SimpleTutorialInternal2.cpp
Normal file
221
doc/HTML/examples/SimpleTutorialInternal2.cpp
Normal file
@@ -0,0 +1,221 @@
|
||||
#include <iostream>
|
||||
// back-end
|
||||
#include <boost/msm/back/state_machine.hpp>
|
||||
//front-end
|
||||
#include <boost/msm/front/state_machine_def.hpp>
|
||||
#include <boost/msm/front/functor_row.hpp>
|
||||
|
||||
namespace msm = boost::msm;
|
||||
using namespace msm::front;
|
||||
|
||||
namespace
|
||||
{
|
||||
// events
|
||||
struct play {};
|
||||
struct end_pause {};
|
||||
struct stop {};
|
||||
struct pause {};
|
||||
struct open_close {};
|
||||
|
||||
// A "complicated" event type that carries some data.
|
||||
enum DiskTypeEnum
|
||||
{
|
||||
DISK_CD=0,
|
||||
DISK_DVD=1
|
||||
};
|
||||
struct cd_detected
|
||||
{
|
||||
cd_detected(std::string name, DiskTypeEnum diskType)
|
||||
: name(name),
|
||||
disc_type(diskType)
|
||||
{}
|
||||
|
||||
std::string name;
|
||||
DiskTypeEnum disc_type;
|
||||
};
|
||||
|
||||
// front-end: define the FSM structure
|
||||
struct player_ : public msm::front::state_machine_def<player_>
|
||||
{
|
||||
// actions for Empty's internal transitions
|
||||
void internal_action(cd_detected const&){ std::cout << "Empty::internal action\n"; }
|
||||
bool internal_guard(cd_detected const&)
|
||||
{
|
||||
std::cout << "Empty::internal guard\n";
|
||||
return false;
|
||||
}
|
||||
struct internal_guard_fct
|
||||
{
|
||||
template <class EVT,class FSM,class SourceState,class TargetState>
|
||||
bool operator()(EVT const& evt ,FSM&,SourceState& ,TargetState& )
|
||||
{
|
||||
std::cout << "Empty::internal guard functor\n";
|
||||
return false;
|
||||
}
|
||||
};
|
||||
struct internal_action_fct
|
||||
{
|
||||
template <class EVT,class FSM,class SourceState,class TargetState>
|
||||
void operator()(EVT const& ,FSM& ,SourceState& ,TargetState& )
|
||||
{
|
||||
std::cout << "Empty::internal action functor" << std::endl;
|
||||
}
|
||||
};
|
||||
|
||||
// The list of FSM states
|
||||
struct Empty : 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: Empty" << std::endl;}
|
||||
template <class Event,class FSM>
|
||||
void on_exit(Event const&,FSM& ) {std::cout << "leaving: Empty" << std::endl;}
|
||||
|
||||
// Transition table for Empty
|
||||
struct internal_transition_table : mpl::vector<
|
||||
// Start Event Next Action Guard
|
||||
Internal < cd_detected , internal_action_fct ,internal_guard_fct >
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
> {};
|
||||
};
|
||||
struct Open : public msm::front::state<>
|
||||
{
|
||||
template <class Event,class FSM>
|
||||
void on_entry(Event const& ,FSM&) {std::cout << "entering: Open" << std::endl;}
|
||||
template <class Event,class FSM>
|
||||
void on_exit(Event const&,FSM& ) {std::cout << "leaving: Open" << std::endl;}
|
||||
};
|
||||
|
||||
// sm_ptr still supported but deprecated as functors are a much better way to do the same thing
|
||||
struct Stopped : public msm::front::state<msm::front::default_base_state,msm::front::sm_ptr>
|
||||
{
|
||||
template <class Event,class FSM>
|
||||
void on_entry(Event const& ,FSM&) {std::cout << "entering: Stopped" << std::endl;}
|
||||
template <class Event,class FSM>
|
||||
void on_exit(Event const&,FSM& ) {std::cout << "leaving: Stopped" << std::endl;}
|
||||
void set_sm_ptr(player_* pl)
|
||||
{
|
||||
m_player=pl;
|
||||
}
|
||||
player_* m_player;
|
||||
};
|
||||
|
||||
struct Playing : public msm::front::state<>
|
||||
{
|
||||
template <class Event,class FSM>
|
||||
void on_entry(Event const&,FSM& ) {std::cout << "entering: Playing" << std::endl;}
|
||||
template <class Event,class FSM>
|
||||
void on_exit(Event const&,FSM& ) {std::cout << "leaving: Playing" << std::endl;}
|
||||
};
|
||||
|
||||
// state not defining any entry or exit
|
||||
struct Paused : public msm::front::state<>
|
||||
{
|
||||
};
|
||||
|
||||
// the initial state of the player SM. Must be defined
|
||||
typedef Empty initial_state;
|
||||
|
||||
// transition actions
|
||||
void start_playback(play const&) { std::cout << "player::start_playback\n"; }
|
||||
void open_drawer(open_close const&) { std::cout << "player::open_drawer\n"; }
|
||||
void close_drawer(open_close const&) { std::cout << "player::close_drawer\n"; }
|
||||
void store_cd_info(cd_detected const&) { std::cout << "player::store_cd_info\n"; }
|
||||
void stop_playback(stop const&) { std::cout << "player::stop_playback\n"; }
|
||||
void pause_playback(pause const&) { std::cout << "player::pause_playback\n"; }
|
||||
void resume_playback(end_pause const&) { std::cout << "player::resume_playback\n"; }
|
||||
void stop_and_open(open_close const&) { std::cout << "player::stop_and_open\n"; }
|
||||
void stopped_again(stop const&) {std::cout << "player::stopped_again\n";}
|
||||
// guard conditions
|
||||
bool good_disk_format(cd_detected const& evt)
|
||||
{
|
||||
// to test a guard condition, let's say we understand only CDs, not DVD
|
||||
if (evt.disc_type != DISK_CD)
|
||||
{
|
||||
std::cout << "wrong disk, sorry" << std::endl;
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
typedef player_ p; // makes transition table cleaner
|
||||
|
||||
// Transition table for player
|
||||
struct transition_table : mpl::vector<
|
||||
// Start Event Next Action Guard
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
a_row < Stopped , play , Playing , &p::start_playback >,
|
||||
a_row < Stopped , open_close , Open , &p::open_drawer >,
|
||||
_row < Stopped , stop , Stopped >,
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
a_row < Open , open_close , Empty , &p::close_drawer >,
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
a_row < Empty , open_close , Open , &p::open_drawer >,
|
||||
// conflict between a normal and 2 internal transitions (irow/g_irow)
|
||||
row < Empty , cd_detected , Stopped , &p::store_cd_info ,&p::good_disk_format >,
|
||||
irow < Empty , cd_detected , &p::internal_action ,&p::internal_guard >,
|
||||
g_irow < Empty , cd_detected ,&p::internal_guard >,
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
a_row < Playing , stop , Stopped , &p::stop_playback >,
|
||||
a_row < Playing , pause , Paused , &p::pause_playback >,
|
||||
a_row < Playing , open_close , Open , &p::stop_and_open >,
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
a_row < Paused , end_pause , Playing , &p::resume_playback >,
|
||||
a_row < Paused , stop , Stopped , &p::stop_playback >,
|
||||
a_row < Paused , open_close , Open , &p::stop_and_open >
|
||||
// +---------+-------------+---------+---------------------+----------------------+
|
||||
> {};
|
||||
// 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 int no_message_queue;
|
||||
|
||||
};
|
||||
// Pick a back-end
|
||||
typedef msm::back::state_machine<player_> player;
|
||||
|
||||
//
|
||||
// Testing utilities.
|
||||
//
|
||||
static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" };
|
||||
void pstate(player const& p)
|
||||
{
|
||||
std::cout << " -> " << state_names[p.current_state()[0]] << std::endl;
|
||||
}
|
||||
|
||||
void test()
|
||||
{
|
||||
player p;
|
||||
// needed to start the highest-level SM. This will call on_entry and mark the start of the SM
|
||||
p.start();
|
||||
// go to Open, call on_exit on Empty, then action, then on_entry on Open
|
||||
p.process_event(open_close()); pstate(p);
|
||||
p.process_event(open_close()); pstate(p);
|
||||
// will be rejected, wrong disk type
|
||||
p.process_event(
|
||||
cd_detected("louie, louie",DISK_DVD)); pstate(p);
|
||||
p.process_event(
|
||||
cd_detected("louie, louie",DISK_CD)); pstate(p);
|
||||
p.process_event(play());
|
||||
|
||||
// at this point, Play is active
|
||||
p.process_event(pause()); pstate(p);
|
||||
// go back to Playing
|
||||
p.process_event(end_pause()); pstate(p);
|
||||
p.process_event(pause()); pstate(p);
|
||||
p.process_event(stop()); pstate(p);
|
||||
// event leading to the same state
|
||||
// no action method called as it is not present in the transition table
|
||||
p.process_event(stop()); pstate(p);
|
||||
}
|
||||
}
|
||||
|
||||
int main()
|
||||
{
|
||||
test();
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user