StackOverflow2013

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plurals

PO
primarykey
Id
4392755
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2010-12-08T21:52:19.107
FavoriteCount
0
LastActivityDate
2010-12-08T22:08:18.410
LastEditDate
2010-12-08T22:08:18.410
LastEditorUserId
25646
OwnerUserId
25646
ParentId
4390950
PostTypeId
2
Score
20
ViewCount
0
LastEditorDisplayName
text
Body
<code>NSDictionary</code> is a class cluster, as Gendolkari said and <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/CocoaObjects.html" rel="noreferrer">Class Clusters are documented</a>. And, no, you can't depend on the exact identity of the private subclass. You should certainly be able to do the following to determine if it is a dictionary or not: <pre><code>[myThingaMaHoover isKindOfClass: [NSDictionary class]]; </code></pre> Or, at the least, that it is a dictionary as implemented as a part of the <code>NSDictinoary</code> class cluster. What you can't do is use <code>isKindOfClass:</code> or <code>isMemberOfClass:</code> to determine whether or not a dictionary (or string, array, or set) is mutable. Consider: <pre><code>NSDictionary *d = [NSDictionary dictionaryWithObject: [[NSObject new] autorelease] forKey: @"Bob"]; NSMutableDictionary *m = [NSMutableDictionary dictionaryWithObject: [[NSObject new] autorelease] forKey: @"Bob"]; NSLog(@"d class: %@ %@ %@", [d class], [d superclass], [[d superclass] superclass]); NSLog(@"m class: %@ %@ %@", [m class], [m superclass], [[m superclass] superclass]); </code></pre> This outputs: <pre><code>d class: NSCFDictionary NSMutableDictionary NSDictionary m class: NSCFDictionary NSMutableDictionary NSDictionary </code></pre> <code>d</code> and <code>m</code> are both instances of <code>NSCFDictionary</code> which inherits from <code>NSMutableDictionary</code> (which inherits from <code>NSDictionary</code>).
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1. POWhy does NSDictionary report an unusual class name?
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2. VO
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1. CO+1 for the example.
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