Re: What classes have -init?
Re: What classes have -init?
- Subject: Re: What classes have -init?
- From: Gordon Apple <email@hidden>
- Date: Thu, 11 Feb 2010 11:03:44 -0600
- Thread-topic: What classes have -init?
It's unfortunate that all initializers don't at least call "init"
internally. That would make subclassing easier if all one needs is to set a
few ivars. In the earlier days of MacApp (Pascal and first C++ versions)
there was a basic initializer, similar to "init", called by all classes,
just for that purpose. Of course, Objective C at least sets them all to
zero, reducing the need -- but it still would have been useful, sometimes
eliminating the need to override multiple initializers.
Of course, you can always override "init" first, just to test whether it
gets called. But then, there's no guarantee in future versions.
>
> True.
>
> But most classes have designated initializers that configure the class
> properly. They should be documented, although typically they‚re used for
> subclassing the class.
>
>
> On Feb 10, 2010, at 3:49 PM, Henry McGilton (Boulevardier) wrote:
>
>>
>> On Feb 10, 2010, at 12:23 PM, James Walker wrote:
>>
>>> I think at times I've written things like [[NSMutableArray alloc] init] with
>>> no apparent ill effects, but now I notice that the docs for NSMutableArray
>>> and NSArray don't say that there is an init method. The NSObject docs say
>>> that an init method might raise an exception. Is there some other init rule
>>> that I've missed, or have I just gotten lucky?
>>
>> When in doubt, remember to look at the super-class documentation:
>>
>> http://developer.apple.com/mac/library/documentation/cocoa/reference/Foundati
>> on/Classes/NSObject_Class/Reference/Reference.html#//apple_ref/doc/uid/200000
>> 50-init
>>
>> All classes that inherit from NSObject (which means pretty much
>> all of them) inherit NSObject's ˆinit method, and that's assumed
>> or implicit in the Array examples you referenced above . . .
>>
>
>
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