Hi Charli,


On Tue, Jan 28, 2014 at 5:54 PM, charlie robert
<charlie.robert at icloud.com>wrote:

> I was thinking that handle may be a capability ref, mutable in the scope
> of the ref state machine.
>

Perhaps you're assuming much more knowledge about Cap'n Proto than I have.
 Could you explain the above?  I have no idea which state machine you're
talking about.  Sorry :-(


> Thank you,
> Robert
>
>
> On Jan 28, 2014, at 2:36 PM, Eliot Miranda <eliot.miranda at gmail.com>
> wrote:
>
>
>
>
> On Tue, Jan 28, 2014 at 1:08 PM, Colin Putney <colin at wiresong.com> wrote:
>
>> On Tue, Jan 28, 2014 at 3:54 PM, Eliot Miranda <eliot.miranda at gmail.com>
>> wrote:
>>
>> > https://plus.google.com/+KentonVarda/posts/GRJ4h4w2UN9?  Or am I being
>> > cynical?
>>
>> Yeah, I think that's what he was talking about. It's hard to see how
>> dynamic languages could use Cap'n Proto, because they don't tend to
>> give enough low-level control over memory layout in the heap.
>>
>
> Wouldn't pinning be enough?  No, because one needs to intermix binary data
> and objects.  But if one added a ref type, or some object handle type, so
> there's just one level of indirection from a handle in the protobuf and an
> object, that might get far enough no?
>
> The alternative would be to add struct support to Spur which might be
> doable.  But it's a lot of work for a rather specific application.  Anyway,
> I'm open to others experimenting on this.
>
> Reminds me of work Tony Mann at Harlequin did or described to me, which
> again is reminiscent of Digitalk's object layout.  The idea is to have the
> class reference in an object (even if this is an index into a table) not
> point directly to the class object, but to refer to some intermediate,
> possibly hidden, structure.
>
> In The Harlequin case this structure included code that would be run by
> the GC to traverse the object, which is how the system supports
> heterogenous structures, and saves on a size field (except for
> variable-sized objects).
>
> In the Digitalk case the structure is a method dictionary, which allows
> the system to support easily instance-specific behaviours.  (Forgive the
> digression).
> --
> best,
> Eliot
>
>
>
>
>
>


-- 
best,
Eliot
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