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| From: | Richard Frith-Macdonald |
| Subject: | Re: NSMutableDictionary requires NSCopying? |
| Date: | Mon, 19 Mar 2007 10:43:36 +0000 |
On 19 Mar 2007, at 10:24, Michael Gardner wrote:
To use a custom key type with NSMutableDictionary, I defined -hash and -isEqual: but not -copyWithZone:, since the NSDictionary docs say that keys are retained rather than copied. But when I try to insert a key of that type, I get an NSInvalidArgumentException saying that my class does not recognize -copyWithZone:. If I add that method, the exception goes away and everything works fine. I've tried this on both the latest GNUstep release and on trunk. Are the docs just out-of-date?
Yes, the documentation is just wrong. Dictionary keys do need to be copied.
I've fixed the documentation (at least, all the errors I spotted) in svn trunk to say that keys are copied.
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