Hi Manuel,

> I want to forward declare a state machine which has a non-default constructor.

>struct wrapper::fsm : public boost::msm::back::state_machine<player_>
>{
> using boost::msm::back::state_machine<player_>::state_machine;
>};

I think you can’t “using” template constructors. Try:

fsm(int some_value):boost::msm::back::state_machine<player_>(some_value){}

HTH,

Christophe