Possible to pass a member function to spawn?

[Oliver Plow]

> MyActor myActor = new MyActor();
> auto tid = myActor.start();
> myActor.run(i);	// call from the parent thread!

I was slow ... I now only made Actor.start() public and all other methods in the actor classes are protected or private and then we are fine.

-- Oliver

-------- Original-Nachricht --------
> Datum: Thu, 09 Feb 2012 09:29:54 +0100
> Von: saxo123 at gmx.de
> An: "digitalmars.D" <digitalmars-d at puremagic.com>
> Betreff: Re: Possible to pass a member function to spawn?

> Hello,
> 
> I'm the guy that made the initial post in this thread. Well, some 100 or
> so replies ago :-). I must admit that I cannot always follow the discussion
> as I'm a real D newbie. As I understand one issue discussed is that the
> actor class is declared shared (see blow the solution I meanwhile came up
> with). The "trick" I'm doing is the MyActor.start() thing: the created instance
> of MyActor is not returned to the outside world but only the tid of the
> spawned thread. This way nobody gets a reference to an actor object he could
> play with from within a different thread.
> 
> Problem is that this also compiles:
> 
> MyActor myActor = new MyActor();
> auto tid = myActor.start();
> myActor.run(i);	// call from the parent thread!
> 
> I believe I will just write down in the docs that this approach is
> strongly discouraged! Another problem ist that
> 
> auto tid = MyActor.start();
> 
> doesn't compile as it should: Error: undefined identifier module
> MyActor.start
> 
> This is a bit strange since this should be legal, f.x. p.176 in the book
> by Alexandrescu provides a analogous example. Same with "tid.send(thisTid,
> Actor.SHUTDOWN)" with Actor.SHUTDOWN.
> 
> Regards, Oliver
> 
> 
> int main()
> {
> 
>     auto tid = MyActor.start();
> 
>     tid.send(123);    
>     tid.send(456);    
>     tid.send(1.0f);
> 
>     tid.send("hello");
> 
>     tid.send(thisTid, Actor.SHUTDOWN);
> 
>     receive( 
>         (int x) { writeln("spawned actor has shut down with return code:
> ", x); 
>     });
> 
>     return 0;
> }
> 
> ----------------- Actor.d ------------------------
> 
> shared abstract class Actor {    
> 
>     public static string SHUTDOWN = "shutdown";
> 
>     protected bool cont = true;
> 
>     Tid start() {
>         return spawn(&dispatch, this);
>     }
> 
>     void run() {
>         while(cont) {
>             act();
>         }
>     }
> 
>     abstract void act();
> 
>     protected bool checkShutdown(Tid sender, string msg) {
>         if(msg == SHUTDOWN) {
>             writeln("shutting down ...");
>             cont = false;
>             sender.send(0);
>             return true;
>         }
>         return false;
>     }
> 
> }
> 
> void dispatch(Actor actor)
> {
>     actor.run();
> }
> 
> ----------------- End of Actor.d ------------------------
> 
> 
> ----------------- MyActor.d ------------------------
> 
> shared class MyActor : Actor {    
> 
>     void run(int i) {
>         writeln(i);
>     }
> 
>     void act() 
>     {
>         receive(
>             (int msg) { run(msg); },
>             (Tid sender, string msg) { checkShutdown(sender, msg); },
>             (Variant v) { writeln("huh?"); }            
>         );
>     }
> 
> }
> -- 
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-- 
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