Re: -[NSSet containsObject:] returns NO when it should return YES

Creating the NSNumber objects using unsignedLongLong instead of longLong solved my problem. Thanks to everyone who participated in the lively discussion. Sorry for being a little slow in closing the loop. -Michael On Feb 21, 2011, at 9:50 PM, Wim Lewis wrote: > > On 19 Feb 2011, at 2:17 PM,

Re: -[NSSet containsObject:] returns NO when it should return YES

On 19 Feb 2011, at 2:17 PM, Michael Crawford wrote: > Anyone have previous experience with this problem? Can you shed some light > on where my thinking and assumptions are wrong. I could write a sweet of > tests to try and prove/disprove what I think is happening but I'm hoping to > benefit f

Re: -[NSSet containsObject:] returns NO when it should return YES

On Sat, 19 Feb 2011 17:17:36 -0500, Michael Crawford said: >I'm trying to compare instances of NSNumber using NSSet. I have a set of >numbers, which represent 64-bit persistent IDs for iTunes media-items. I >access these values using the -[NSNumber longLongValue] method. You're having a fund

Re: -[NSSet containsObject:] returns NO when it should return YES

Michael Crawford wrote: The following gdb console output demonstrates an instance of a media-item persistent-ID property that, when queried gives a large unsigned number. When I ask again using the -longLongValue method, I get the answer I was expecting. When I look inside the set, you

Re: -[NSSet containsObject:] returns NO when it should return YES

Ah, thanks. That's here: I was only looking at the NSSet docs. --Andy On Feb 20, 2011, at 1:03 AM, Roland King wrote: > > On 20-Feb-2011, at 1:54 PM, Andy Lee wrote: > >> >> One thing I'

Re: -[NSSet containsObject:] returns NO when it should return YES

On 20-Feb-2011, at 1:54 PM, Andy Lee wrote: > > One thing I'm puzzled about is that NSSet does not copy its entries the way > NSDictionary copies its keys. This is implied by the member: documentation > quoted earlier: > > "If the set contains an object equal to object (as determined by isEqu

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 10:31 PM, Ken Thomases wrote: > On Feb 19, 2011, at 9:26 PM, Quincey Morris wrote: > >> On Feb 19, 2011, at 19:06, Kyle Sluder wrote: >> >>> Your experience indicates that -containsObject: uses pointer identity, >>> whereas -member: uses -isEqual:. >> >> What's especially c

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 9:26 PM, Quincey Morris wrote: > On Feb 19, 2011, at 19:06, Kyle Sluder wrote: > >> Your experience indicates that -containsObject: uses pointer identity, >> whereas -member: uses -isEqual:. > > What's especially confusing is that -[NSArray containsObject:] is documented >

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 19:06, Kyle Sluder wrote: > On Feb 19, 2011, at 7:01 PM, Michael Crawford wrote: > >> >> I assumed this is the case because regardless of whether or not you call >> -boolValue or -longLongValue, -hash returns the same result. I've already >> shown that they do indeed cont

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 9:01 PM, Michael Crawford wrote: > On Feb 19, 2011, at 9:31 PM, Ken Thomases wrote: > >> On Feb 19, 2011, at 4:17 PM, Michael Crawford wrote: >> >>> I also assumed that whether or not the value is signed or unsigned; >>> negative or positive makes no difference as long as ca

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 6:08 PM, Andy Lee wrote: > I just did a quick test and confirmed that you do get two different instances > with the same hash, but they are in face isEqual: to each other and hence > their presence in a set is detected, as I would expect. > > NSNumber *one = [NSNumber numbe

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 7:01 PM, Michael Crawford wrote: > > I assumed this is the case because regardless of whether or not you call > -boolValue or -longLongValue, -hash returns the same result. I've already > shown that they do indeed contain the same value, when -longLongValue is > called on

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 9:31 PM, Ken Thomases wrote: > On Feb 19, 2011, at 4:17 PM, Michael Crawford wrote: > >> I also assumed that whether or not the value is signed or unsigned; negative >> or positive makes no difference as long as calling the same accessor method >> on both NSNumber instances

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 4:17 PM, Michael Crawford wrote: > I also assumed that whether or not the value is signed or unsigned; negative > or positive makes no difference as long as calling the same accessor method > on both NSNumber instances returns the same result. I think this is wrong. I can't

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 5:17 PM, Michael Crawford wrote: > When I look inside the set, you will see that the value -1748299021286640132 > is in the set. However, when -containsObject is called, it returns NO. Are you sure the objects you are dealing with are always NSNumbers? If one of them is an N

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 2:17 PM, Michael Crawford wrote: > I'm trying to compare instances of NSNumber using NSSet. I have a set of > numbers, which represent 64-bit persistent IDs for iTunes media-items. I > access these values using the -[NSNumber longLongValue] method. I'm adding > them to an

Re: -[NSSet containsObject:] returns NO when it should return YES

On Feb 19, 2011, at 3:17 PM, Michael Crawford wrote: > I assumed that the -[NSObject hash] method is used to determining equality > and that to different NSNumber instances will hash out to the same value if > they have the same 64-bit value stored inside. I'm pretty sure that, for instance, tw

-[NSSet containsObject:] returns NO when it should return YES

I'm trying to compare instances of NSNumber using NSSet. I have a set of numbers, which represent 64-bit persistent IDs for iTunes media-items. I access these values using the -[NSNumber longLongValue] method. I'm adding them to an instance of NSSet and then use that instance to determine whe