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Subject: Re: [boost] [MSM] Surprising Entry Point behaviour
From: christophe.j.henry_at_[hidden]
Date: 2016-03-06 16:22:27

Hi Michael,

>MSM is trying to generate code into B for a transition with a 'none'
>event. This could be valid if the transition from Top::X wasn't via the
>entry point and just directly to Sub. I don't think there is a path to B
>with a 'none' event.

Your guess is correct. The problem is that I'm forced to use a mpl::for_each
when using an anonymous event within a submachine. You will find the call to
mpl::for_each in the compiler stack trace.
Though not all events have a transition with none, MSM is forced to generate
a possibility for it. Normally it is not a problem, unless you add your own
on_entry replacing the default one.
Having both versions will make the compiler happy and the template version
will not be called.
I think I'll want to revisit this implementation in a future C++14 rewrite.


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