Re: Using NSImages as keys to a dictionary
Re: Using NSImages as keys to a dictionary
- Subject: Re: Using NSImages as keys to a dictionary
- From: "Michael Ash" <email@hidden>
- Date: Sat, 13 May 2006 17:16:23 -0400
On 5/13/06, Adam R. Maxwell <email@hidden> wrote:
Another way to do this might be to create a CFMutableDictionary with
custom callbacks that retain keys instead of copying them, and
compares keys based on pointer equality; with toll-free bridging,
you'd just treat it as a standard NSMutableDictionary. You have to
ensure that the hash of the keys (NSImage instances) doesn't change
while they're in the dictionary, though.
Sadly, this doesn't work. While you can indeed treat such a
CFMutableDictionary as an NSMutableDictionary, the Cocoa methods will
not respect your custom callbacks. In other words, if you create a
CFMutableDictionary which does not copy its keys, then do [myCFDict
setObject:obj forKey:key], key *will* be copied.
I consider this a bug and have filed it as rdar://4350677 . The
obvious workaround is to use the actual CF functions instead, which is
not really a problem.
Mike
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