Count of object references?

[bearophile]

Bottled Gin:

> Given a class object, is there a way to find out the number of 
> references to it. I have a situation where a container is 
> holding an object and I would like to remove the object from 
> the container if there is nobody else referencing it.
>
> Is it possible in D?

What you want is a container that keeps weak references 
(http://en.wikipedia.org/wiki/Weak_reference ).
Currently (I think) there are no weak references in Phobos, but 
eventually it should be added. Probably somewhere there is some 
implementation.

Bye,
bearophile