[Boost-users] [msm] EUML in a header file

Subject: [Boost-users] [msm] EUML in a header file
From: Nate Knight (nate.knight_at_[hidden])
Date: 2011-05-09 13:18:18

Christophe,

One problem I've run into with the EUML frontend is the the _EVENT, _ACTION and _STATE
macros define non-static instance variables.  So, if I define a state machine in a header file which
then gets included in multiple source files (e.g. I have two classes which use the same state machine)
I get linker errors about duplicate instances.  For states, I can work around this issue by doing, for example, 

BOOST_MSM_EUML_DECLARE_STATE((),MyStateType)
static MyStateType MyState;

and then using MyState in the transition table.  Events and Actions don't seem to have the corresponding 
_DECLARE_ macros, so this workaround isn't really feasible at this point in time.  Any thoughts?

Thanks
Nate