[boost] Fwd: [MSM] exit_ps stuks in case of outer state machine uses Row with event to event base class

Subject: [boost] Fwd: [MSM] exit_ps stuks in case of outer state machine uses Row with event to event base class
From: Richard Szabo (sz.richard_at_[hidden])
Date: 2011-06-15 06:32:52

Thanks Christophe

I will try it out but we use the queue anyhow because we send signals
to our self some cases.
It was just a copy paste mistake for the example to disable queues.

the real problem is the constructor if I define this :

   event4 (const event3& evt_)
     : baseEvent()
   {

   }

than it works (after enabling the queue).

So I don't get it why it is compiles ..... and now I have to figure
out what has changed in our real code which hides the copy constructor
.....

Thanks for your support

PS : We update to latest MSM time to time and even using new features
of it like Enqueueing events for later processing

Thanks
Richard

On 15 June 2011 06:42, Christophe Henry
<christophe.j.henry_at_[hidden]> wrote:
>> 3. This one is my fault and might be a problem for you as you seek
>> performance. I think we discussed this but I forgot it in the doc. Pseudo
>> exits require the message queue and you deactivated it with:
>> typedef int no_message_queue;
>
> Thinking again about it, as you have the newest MSM version (time for a bit
> of advertisement for the new version ;-) ), there is now a way around the
> queue.
> The exit point needs the queue because it will process an event4 during
> processing of event3, so that MSM has time to update its current state
> before processing event4. But this is only because MSM does this after the
> transition (the UML standard "forgot" to specify this point).
> The newest version allows you to override this and decide that this updating
> job will be done for example before the transition is taken (after the guard
> chooses the transition of course), or after the exit action, etc.
> To do this, add into every state machine:
>
> typedef msm::active_state_switch_before_transition
> active_state_switch_policy;
>
> Now you don't need the queue. Doc is there:
> http://svn.boost.org/svn/boost/trunk/libs/msm/doc/HTML/ch03s05.html#backend-state-switch
>
> Regards,
> Christophe
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