Re: [Boost-users] Boost statechart, how can i transit to previous state using deep_history or shallow history

16 Apr 2016

      I believe your state machine is incorrectly structured.  Consider
encapsulating your input and output states within a higher-level
state. Assume this super-state is called "io". So, now you have three
top-level states: idle, io, and cancel.  Place the history transition
within io.

Now, when you trigger "revert" from the cancel state specify a
transition to io.  This should give you the desired effect.

Dan Kelly
djkelly@computer.org
...
On Apr 12, 2016, at 09:37, juls  wrote:
I have a difficulty in understanding the boost statechart history
functionality.
I have the following state machine.
struct InButtonPressed : sc::event<InButtonPressed> {};
struct OutButtonPressed : sc::event<OutButtonPressed> {};
struct InButtonPressed : sc::event<InButtonPressed> {};
struct InputProceed: sc::event<InputProceed> {};
struct OutputProceed: sc::event<OutputProceed> {};
struct CancelEvent: sc::event<CancelEvent> {};
struct Proceed: sc::event<Proceed> {};
struct Revert: sc::event<InputProceed> {};
struct RH_StateMachine : bsc::state_machine< RH_StateMachine, Idle > {};
struct Idle : bsc::state< Idle, RH_StateMachine> {
   Idle(my_context ctx) : my_base(ctx){
       std::cout << "[+] Idle" << std::endl;
       }
   ~Idle(){std::cout << "[-] leaving Idle state... \n";}
   typedef  boost::mpl::list< bsc::transition< InButtonPressed, Input>,
       bsc::transition< OutButtonPressed, Output>
...
reactions;
};
struct Input : bsc::state< Input, RH_StateMachine> {
   Input(my_context ctx) : my_base(ctx){
       std::cout << "[+] Input" << std::endl;
       }
   ~Input(){std::cout << "[-] leaving Input state... \n";}
     typedef  boost::bsc::transition< CancelEvent, Cancel>
...
reactions;
};
struct Output : bsc::state< Output, RH_StateMachine> {
   Output(my_context ctx) : my_base(ctx){
       std::cout << "[+] Output" << std::endl;
       }
   ~Output(){std::cout << "[-] leaving Output state... \n";}
     typedef  boost::bsc::transition< CancelEvent, Cancel>
...
reactions;
};
struct Cancel::bsc::state{
     Cancel(my_context ctx) : my_base(ctx){
       std::cout << "[+] Cancel" << std::endl;
       }
   ~Cancel(){std::cout << "[-] leaving Cancel state... \n";}
     typedef  boost::mpl::list< bsc::transition< Proceed,
CanceledConfirmed>,
       bsc::transition< Revert, *"PREVIOUS_STATE"*>
...
reactions;
};
How do i implement transitioning to previous state using deep_history or
shallow history, when i can transit to a state from many different states?
In the above state machine i want to transit from Cancel state to the
previous state when the revert event is triggered, but i have already
transited in Cancel state from either Input or Output state...
Thank you in advance.
--
View this message in context: http://boost.2283326.n4.nabble.com/Boost-statechart-how-can-i-transit-to-pre...
Sent from the Boost - Users mailing list archive at Nabble.com.
_______________________________________________
Boost-users mailing list
Boost-users@lists.boost.org
http://lists.boost.org/mailman/listinfo.cgi/boost-users

Re: [Boost-users] Boost statechart, how can i transit to previous state using deep_history or shallow history

Daniel Kelly