Re: Clarification on the effect of "DROP" on subobjects.

[Paul E Johnson]

Tim Rogers wrote:
> 
> I've tried searching through the swarm archives, and have looked up the
> details of the call drop under defobj in the reference manual, and I'm
> still a bit confused about what happens to objects which are instance
> variables of another object, which is dropped.
> 
> Suppose we have an object called Wine, inherited from the standard
> SwarmObject, with instance variables as follows:
> 
> Wine
> {
> int cost
> id wineDetails;
> id *wineShop;
> }
> 
> Suppose I want to get rid of a Wine object:
> 
> [aWine drop];
> 
WineDetails and wineShop will not get dropped automatically.  Write a
method which overrides the default.

-(void) drop
{
        [wineDetails Drop];
        [whatever is necessary to free wineShop];
        [super drop];
}

I believe that if you created these objects in a separate zone, and then
dropped the zone, then they would all get wiped out automatically. 
That's allowed,but not standard.

>
-- 
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66045                FAX: (785) 864-5700

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