On Jul 28, 2008, at 12:34, Andy Lee wrote:
On Jul 28, 2008, at 2:31 PM, Dave Carrigan wrote:
On Jul 28, 2008, at 11:13 AM, Carter R. Harrison wrote:
If I wanted to store an object in a dictionary and set its key as
the object's memory address - how would I go about doing this?
I'm racking my brains trying to think of a good reason to do this
and am drawing a blank. I can, however, think of myriad bad reasons.
Count me as another mystified person -- can you say what you're
trying to do? I'm thinking maybe some kind of serialization or
maybe object caching, but nothing makes sense. It sounds like what
you want is a set of objects rather than a dictionary. If you have
an address you can just dereference the address -- you don't need to
look it up in a dictionary.
I've used this technique when replacing objects in an object graph
with different objects. There may be multiple references an "old"
object in the graph, and there may be multiple paths through the graph
to each reference. When walking the graph, you just use [dict
objectForKey: [NSValue valueWithNonretainedObject: oldObject]] to find
out if you've already generated a replacement for the old object yet,
and use [dict setObject: newObject forKey: [NSValue
valueWithNonretainedObject: oldObject] to remember the replacement if
you haven't.
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