using Self = data;

public:

explicit data(const std::string& address) : address{address} {}

auto operator()() {

using namespace boost::sml;

const auto set = [](const auto& event, Connected& state) { state.id = event.id; };

const auto update = [](Connected& src_state, Interrupted& dst_state) { dst_state.id = src_state.id; };

// clang-format off

return make_transition_table(

* state<Disconnected> + event<connect> / (set, &Self::print) = state<Connected>

, state<Connected> + event<interrupt> / (update, &Self::print) = state<Interrupted>

, state<Interrupted> + event<connect> / (set, &Self::print) = state<Connected>

, state<Connected> + event<disconnect> / (&Self::print) = X

);

// clang-format on

}

private:

void print(Connected& state) { std::cout << address << ':' << state.id << '\n'; };

std::string address{}; /// shared data between states

data d{std::string{"127.0.0.1"}};

sml::sm<data> sm{d, Connected{1}};

sm.process_event(connect{1024});

sm.process_event(interrupt{});

sm.process_event(connect{1025});

sm.process_event(disconnect{});

assert(sm.is(sml::X));