[Boost-users] statechart not working...

Subject: [Boost-users] statechart not working...
From: Noah Roberts (roberts.noah_at_[hidden])
Date: 2010-05-14 19:22:13

Why isn't this statechart doing anything?

struct mouse_move : sc::event<mouse_move> {};
struct lock_fly : sc::event<lock_fly> {};
struct unlock_fly : sc::event<unlock_fly> {};

struct arrow_outer;

struct arrow_tool : sc::state_machine<arrow_tool,arrow_outer> {};

struct unlocked;

struct arrow_outer : sc::simple_state<arrow_outer, arrow_tool, unlocked> 
{};

struct locked : sc::simple_state<locked, arrow_outer> 
{
  locked() { std::cerr << "locked\n"; }
  ~locked() { std::cerr << "unlocking\n"; }

  typedef sc::transition<unlock_fly, unlocked> reactions;
};
struct unlocked : sc::simple_state<unlocked, arrow_outer> 
{
  unlocked() { std::cerr << "unlocked\n"; }
  ~unlocked() { std::cerr << "locking\n"; }

  typedef sc::transition<lock_fly,locked> reations;
};

int main()
{
  arrow_tool tool;
  tool.initiate();

  //tool.process_event(mouse_move());
  tool.process_event(lock_fly());
  //tool.process_event(mouse_move());
  tool.process_event(unlock_fly());
  //tool.process_event(mouse_move());

  std::cin.get();
}

I expect:
unlocked
locking
locked
unlocking
unlocked
locking

I get:
unlocked
locking

My events are obviously not triggering transitions.  From what I can 
tell it's almost exactly like the stopwatch example with some different 
names and no self-transition in the outermost state.

I've stepped through the program and it seems that the event processor 
ends up passing everything down as an unrecognized event.

-- 
http://crazyeddiecpp.blogspot.com/