Re: Weak references

Ack. Helps if I 'chmod a+r ~/public_html/php-ext-weakref.tgz'. Chris On Sat, 8 Mar 2003, Chris Vandomelen wrote: > I've written a simple extension for supporting weak (non-refcounted) > references in PHP, so that object graphs which reference themselves will > function properly. I don't know if this will be useful to anyone else, but > the code for the extension can be found at > http://4.61.245.27/~chrisv/php-ext-weakref.tgz. (Until the DSL > line that > I'm in front of decides that it's going to get a new IP address, anyway..) > > The extension implements 2 functions: > resource(weak reference) weakref(object $o): Returns a resource > representing the input object. The reference is not > counted against the object, and becomes invalid when the > refcount of $o becomes 0. > object weakref_get(resource(weak reference) $r): If the object > that $r represents is still valid, this increases the > refcount on the object and returns it. Otherwise it > returns false. > > It should only compile against ZE2, as it needs access to > EG(objects_store) to check and see if an object reference is still valid > or not. (Unless there is some other way of checking to see if an object ID > still exists, which I didn't happen to spot during my quick browsing of > the source.) > > It's one of those little things that happens to seem like a good idea > (being able to reference parent objects from a child object is a quite > handy feature at times, especially when working with stuff that looks like > DOM trees and whatnot.) > > Chris > > > > -- > PHP Development Mailing List <http://www.php.net/> > To unsubscribe, visit: http://www.php.net/unsub.php >