[DGD]1.2.18

[Felix A. Croes]

Mikael Lind <z94lind at mtek.chalmers.se> wrote:

>[...]
> Light-weight objects under DGD sound very intriguing. I do not think
> that I have seen them mentioned before. Is it possible to get some
> kind of explanation of what they will be like? My initial thought was
> along the lines of objects that one can use for abstract data types
> and similar things; basically, objects that are garbage-collected by
> the driver.

That is indeed what they are.  Like clones, they are created from a
master object, which is a normal, persistent object.  Light-weight
objects do have some restrictions:

 - they cannot be explicitly destructed
 - they cannot be used as an editor, user or parser object
 - they cannot have callouts
 - destructing a master object will also instantly destruct all
   light-weight objects made therefrom (!)

Furthermore, like arrays, they are local to the dataspace of some
particular (persistent) object.  This means that if a light-weight
object is exported to some other object's dataspace, it will become
a <copy> there at the end of the LPC thread, just as currently
happens with arrays and mappings.

I hope to release a partial implementation of light-weight objects
tonight.

Regards,
Dworkin

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