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From: "Steve" <nospam_steved94@comcast.net>
Newsgroups: comp.lang.ada
References: <fed2d60.0404281048.41d6c549@posting.google.com>
Subject: Re: Hierarchical States Machines
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Xref: archiver1.google.com comp.lang.ada:7553
Date: 2004-04-29T03:58:08+00:00
List-Id: <comp.lang.ada>

I don't have anything against using goto's for state machines... but...

I usually set up an enumeration for each state:

  type my_states is ( start_state, initializing, etc, end_state );

And then use a loop with an enclosed case statement:

  state := start_state;
  loop
    case state is
      when start_state =>
         ...
         state := initializing;
      when initializing =>
      when etc =>
      when end_state =>
    end case;
  end loop;

In my opinion it makes things easier to follow since the entry
to a new state always happens from the same place.

Steve
(The Duck)

"Fabien" <fab_lio@yahoo.fr> wrote in message
news:fed2d60.0404281048.41d6c549@posting.google.com...
> Hi everyone !!!
>
> Pretty new to ADA dev., i am currently trying to implement a
> hierarchical state machine for my application. So far, i must confess
> that i do not really get on well with it. I am thus looking for some
> people who might have tried to do it and who could give me some useful
> tips .
>
> Fabien
>
> pS : I don't look for a ready-to-use solution, just some help !!!!!