Re: Determining whether a dictionary is mutable or not
Re: Determining whether a dictionary is mutable or not
- Subject: Re: Determining whether a dictionary is mutable or not
- From: Clark Cox <email@hidden>
- Date: Fri, 14 Jan 2011 03:43:44 -0800
On Fri, Jan 14, 2011 at 3:34 AM, email@hidden
<email@hidden> wrote:
>
>
> On 14 Jan 2011, at 11:25, Tito Ciuro wrote:
>
>> Hi Mike,
>>
>> Given that the caller can pass a NSDictionary or an NSMutableDictionary, I wanted to test its mutability before calling setObject:forKey:. In order to avoid calling mutableCopy each time, I thought it would be more efficient to test it and then call mutableCopy only when needed.
>>
>> Thanks for the help,
>>
>> -- Tito
>>
>
> In this case just check if your object responds to setObject:forKey:
> If it does its mutable, if not it isn't.
Unfortunately, that will not work. Internally, both NSDictionary and
NSMutableDictionary are implemented by the same class; even
NSDictionary responds to -setObject:forKey: (it won't do much other
than throw an exception if called, but it implements it nonetheless)
--
Clark S. Cox III
email@hidden
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