I'm trying to create an NSDictionary that uses key based upon the contents of a NSSet (specifically a set of NSManagedObjectID's). I'm currently at a bit loss as to how to do it. My various attempts at a hash based solution (see below) don't appear to be working.
Are you creating a map from the NSSet to something else? An NSMapTable may be more appropriate.
A note on your pasted code:
NSString *hashFromCharacteristicTypes = [NSString stringWithFormat: [[NSNumber numberWithInteger:hashInt] stringValue]];
NSDictionary keys can be any object that adheres to NSCopying, so you don’t need to convert the number to a string before placing it in the dictionary.
(In fact, you can make the set the key, but I have a feeling you probably don’t want to copy the set.)
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