[DGD] Memory management

[Erwin Harte]

On Tue, Mar 19, 2002 at 05:07:45PM -0500, Jay Shaffstall wrote:
> 
> >To expand on this: for persistent objects (which is all you'll see in the 
> >kernel library) the references to the object are of no consequence; when 
> >the object is destructed, any existing reference to the object will 
> >evaluate to 'nil'.
> 
> Does this include references in mappings and arrays?  The kernel userd 
> object uses a logout method to specifically remove a user from the array 
> and mapping it maintains.  Seems as if this wouldn't be needed, since the 
> user object itself is destructed soon after.

In arrays they turn to nil as well.  Mappings are special, in the
sense that if an entry in the mapping (index or value or both) refer
to a destructed object, the entry is cleaned out before you see it in
LPC space (i.e: before DGD returns the result of one of the map_*
kfuns or an index into a mapping.

So if you had:

  mapping m;

  m = ([ <someobject>: 1 ]);

And destruct <someobject>, then m will be ([ ]) the next time you look
at it.

Same for this:

  mapping m;

  m = ([ 100: <someobject> ]);

Hope that helps,

Erwin.
-- 
Erwin Harte <harte at xs4all.nl>
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