Re: behavior of -copy
Re: behavior of -copy
- Subject: Re: behavior of -copy
- From: Mike Abdullah <email@hidden>
- Date: Thu, 27 May 2010 14:18:16 +0100
On 27 May 2010, at 13:59, Ariel Feinerman wrote:
> Hi,
>
> if i understand, -copy message implement via -retain for true immutable
> objects like NSNumber, via -alloc, -init thus make true copy for mutable
> objects like NSMutableArray, my question is: what does -copy for immutable
> variant of immutable/mutable objects, for instance NSArray *arrayCopy =
> [array copy]; returns true copy or retains one? Or what does happen if
> object itself is immutable and has not setters, but it instance variables is
> mutable and can be changed?
> NSDictionary instance has NSMutableDictionary values
Container classes make shallow copies of themselves. If you've got a dictionary containing mutable dictionary values, you either:
A) NSDictionary *copy = [[NSDictionary alloc] initWithDictionary:myDict copyItems:YES];
B) Look again at your code and think that it would probably be better to create model classes rather than nested dictionaries.
>
>
> --
> best regards
> Ariel
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