Re: [boost] [msm] Nested submachines and explicit state entry

Subject: Re: [boost] [msm] Nested submachines and explicit state entry
From: Michael.Herchel_at_[hidden]
Date: 2010-06-10 03:33:30

Hi Christophe,

>>> There are several reasons to this and it took me a while to figure out
>>> what was happening.
>>> The first one is that there are 2 errors in the example:
>>> RunningStateMachine::Inner1::direct<RunningStateMachine_::Inner1_> 
should be:
>>> RunningStateMachine::direct<RunningStateMachine_::Inner1>
>>>
>>> As you are directly entering RunningStateMachine, not Inner1.
>>
>>actually I have made 2 mistakes :). One above the second is that I used 
Inner1_
>>which is a frontend instead of Inner1 caused that the on initial 
transition
>>is getting triggered after entry of Inner1

>Ah yes I forgot that I corrected that one too.

Could you please also correct the documentation regarding explicit entry.
In the documentation you explicitly say that you have to pass the front 
end, which is wrong according to you.

MSM Documentation (section: Explicit Entry):
---------------------------------------------
You can then use it as target in a transition with State1 as source:
_row < State1, Event2, SubFsm2::direct< SubFsm2_::SubState2> >
The syntax deserves some explanation. SubFsm2_ is a front end. SubState2 
is a nested state, therefore the SubFsm2_::SubState2 syntax. The 
containing machine (containing State1 and SubFsm2) refers to the backend 
instance (SubFsm2). SubFsm2::direct states that an explicit entry is 
desired.
---------------------------------------------

So I think the code snippet has to look like as follows (SubFsm2 instead 
of SubFsm2_):
_row < State1, Event2, SubFsm2::direct< SubFsm2::SubState2> >

Regards,
Michael