On Jul 28, 2008, at 3:56 PM, Quincey Morris wrote:
On Jul 28, 2008, at 12:34, Andy Lee wrote:
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.
Neat. Thanks, I'm much less mystified now.
--Andy
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