[DGD] Re: Possible bug in DGD 1.1?

[Par Winzell]

> The problem, succinctly, is that I appear to be unable to make
> a call_out to a static function. My auto object has the two
> following functions (heavy snippage applied):
> 
>    void set_heart_beat (int time) {
>        heart_beat_handle=call_out("do_heart_beat",time) ;
>        write ("HBH is "+heart_beat_handle+"\n") ;
>    }
> 
>    static void do_heart_beat() {
>        get_object(ME)->catch_tell("foo") ;
>        err = catch(this_object()->heart_beat()) ;
>        heart_beat_handle = call_out("do_heart_beat",heart_beat_time) ;
>    }

Somebody more knowledgeable than me will surely respond, but since
nobody has yet -- with the proper disclaimers -- as I understand it,
static functions in the auto object are treated differently from ones
defined elsewhere. They are seen as kfuns, meaning you can't call them
using a this_object()->foo(); kind of deal, which you normally can. It
seems to me that that is what call_out() eventually does.

>From sneaked looks at other auto objects using call_out, I believe you
can accomplish the security check with:

   void set_heart_beat (int time) {
       heart_beat_handle=call_out("do_heart_beat",time) ;
       write ("HBH is "+heart_beat_handle+"\n") ;
   }

   void do_heart_beat() {
       if (previous_program()) return; /* tadaa */
       get_object(ME)->catch_tell("foo") ;
       err = catch(this_object()->heart_beat()) ;
       heart_beat_handle = call_out("do_heart_beat",heart_beat_time) ;
   }

Hope that does it. Hope I'm right.

  Zell



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