Re: How to recognize mutability?
Re: How to recognize mutability?
- Subject: Re: How to recognize mutability?
- From: Ronald Oussoren <email@hidden>
- Date: Wed, 20 Feb 2013 09:22:53 +0100
On 20 Feb, 2013, at 9:10, Gerriet M. Denkmann <email@hidden> wrote:
> I am trying to build my own version of NSKeyed(Un)Archiver.
>
> But I do not know how to recognise mutability.
Use "classForKeyedArchiver" (or one of the other variants) to detect as which class an object wants to be archived.
This will return [NSMutableString class] for mutable strings and [NSString class] for immutable ones.
Ronald
>
> 1. use isKindOfClass: [NSMutableString class]
> disadvantage: all strings turn out to be mutable
>
> 2. use respondsToSelector: @selector(appendString:)
> disadvantage: all strings turn out to be mutable
>
> 3. mutate the string (in a @try block) if exception, then immutable, else mutate the string back.
> disadvantage: very inelegant and probably quite slow
>
> 4. use some undocumented (which?) method
> disadvantage: might break with next OS release
>
> 5. anything else?
>
> Gerriet.
>
> P.S.
> I want my own archiver for 2 reasons:
> 1. NSKeyedArchiver can store only certain strings
> 2. It creates files, which are 10 times bigger than my version (and 5 times bigger than NSArchiver)
>
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