[e-lang] Newbie question

[Mariano Montone]

Thanks. I will have to study E in more detail in order to understand some
things in your code (and I will). However I can realize that you are
building some kind of 'composite message' in the form of message list. I
wonder weather executing 'eventual code' may be possible (I mean, it
wouldn't break the E model). Something like:

def carRcvr := carMakerRcvr <- ("Mercedes")
carRcvr <- lambda(car){ car.moveTo(2,3)
                                   car.moveTo(5,6)
                                   car.moveTo(7,3) }

where lambda(car) {....} is an anonymous function that is executed
eventually over the car (don't know how to write anonymous functions in E,
or if it is possible)

Mariano

2006/3/30, Kevin Reid <kpreid at attglobal.net>:
>
> On Mar 29, 2006, at 10:00, Mariano Montone wrote:
>
> > How can I perform a sequence of message sends atomically, in a
> > transactional way, to a remote object? How can I get rid of
> > something like that under the E model?
> >
> > In the following example, I would like carRcvr to stay in place
> > between the moveTo messages.
> >
> > def carRcvr := carMakerRcvr <- ("Mercedes")
> > carRcvr <- moveTo(2,3)
> > carRcvr <- moveTo(5,6)
> > carRcvr <- moveTo(7,3)
>
> def sequence(target, messages) :void {
>
>    def deliverer implements PassByCopy {
>      to __optUncall() { ... }
>      to run(target) :void {
>        if (Ref.isEventual(target)) {
>          target <- __whenMoreResolved(deliverer)
>        } else {
>          for message in messages { E.callWithPair(target, message) }
>        }
>      }
>    }
>
>    deliverer(target)
> }
>
> sequence(carRcvr, [["moveTo", [2, 3]],
>                     ["moveTo", [5, 6]],
>                     ["moveTo", [7, 3]]]))
>
> No existing E implementation supports 'implements PassByCopy' yet;
> without it this will still work for 'atomic' sends in a single vat.
>
> --
> Kevin Reid                            <http://homepage.mac.com/kpreid/>
>
>
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