[DGD] Leaf objects

[Raymond Jennings]

I think all dgd mudlibs should enforce this "you can either inherit it, or
clone/call/lwo it, but not both"

On Tue, Jul 28, 2015 at 1:54 AM, <bart at wotf.org> wrote:

> Kent,
>
> Note that the gurbalib kernel you use
> enforces the same rule (can't clone an
> inheritable and can't inherit a clonable).
> It doesn't have the nice solution of
> auromatically generating a clonable in such
> a case through that wouldn't be too
> difficult.
>
> On gurbalib those restrictions are in
> compiler_d in allow_inherit and
> allow_object. Felix'explanation tells why
> this is important, and why those
> restrictions should be left in place and
> enforced very strictly. You will *NOT* be
> able to support runnong dgd as a persistent
> server without enforcing those rules as you
> won't be able to recompile things without
> losing data and state.
> Along the same lines, you should make sure
> all your changes can be handled by the
> warmboot and rebuild commands.
>
> Bart
>
> On Mon, 27 Jul 2015 13:27:47 +0200, Felix A.
> Croes wrote
> > Blain <blain20 at gmail.com> wrote:
> >
> > > I noticed in your cloud server you use
> leaf objects for cloning.  May I ask
> > > what the benefit of this is?
> >
> > To explain, a leaf object is an object
> which is not inherited by any
> > other, and the cloud server lib
> automatically generates a leaf object
> > when you are trying to clone from a /lib/
> object, and clones from
> > that instead.  The purpose is to ensure
> that no object you clone
> > from is inherited by any other, while
> allowing one to clone from a
> > /lib/ object as a shortcut.
> >
> > Objects that can be inherited should never
> be used to clone from, since
> > that prevents the clones from being
> upgraded.  An inherited object
> > can only be upgraded by first destructing
> and then recompiling it,
> > while a leaf object can be recompiled in
> place, without destructing
> > it; this will also upgrade all clones of
> the leaf object.
> >
> > Regards,
> > Felix Croes
> >
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