#include <assert.h>
#include <ffsm2/machine.hpp>
struct Context {
    bool on = false;
};
using Config = ffsm2::Config
                    ::ContextT<Context&>;
using M = ffsm2::MachineT<Config>;
using FSM = M::PeerRoot<
                struct Off,
                struct On
            >;
struct Off
    : FSM::State
{
    void enter(PlanControl& control) {
        control.context().on = false;
    }
};
struct On
    : FSM::State
{
    void enter(PlanControl& control) {
        control.context().on = true;
    }
};
int
main() {
    Context context;
    FSM::Instance machine{context};
    machine.changeTo<On>();
    machine.update();
    assert(context.on == true);
    return 0;
}