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Re: copy & isEqual nightmares
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Re: copy & isEqual nightmares


  • Subject: Re: copy & isEqual nightmares
  • From: Quincey Morris <email@hidden>
  • Date: Thu, 16 Feb 2012 13:47:19 -0800

On Feb 16, 2012, at 11:44 , Ken Thomases wrote:

> Well, the documentation for -[NSDictionary isEqualToDictionary:] <https://developer.apple.com/library/ios/DOCUMENTATION/Cocoa/Reference/Foundation/Classes/NSDictionary_Class/Reference/Reference.html#//apple_ref/occ/instm/NSDictionary/isEqualToDictionary:> says:
>
> "Returns a Boolean value that indicates whether the contents of the receiving dictionary are equal to the contents of another given dictionary."
>
> And:
>
> "Two dictionaries have equal contents if they each hold the same number of entries and, for a given key, the corresponding value objects in each dictionary satisfy the isEqual: test."

That's what I meant by a hint. We *assume* that by design -[NSDictionary isEqual:] invokes -[NSDictionary isEqualToDictionary:], perhaps with a check on the class of the parameter first.

The other hint I found was in the NSObject protocol for 'isEqual:':

<https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Protocols/NSObject_Protocol/Reference/NSObject.html>

"This method defines what it means for instances to be equal. For example, a container object might define two containers as equal if their corresponding objects all respond YES to an isEqual: request. See the NSData,NSDictionary, NSArray, and NSString class specifications for examples of the use of this method."

Note that it says "might". Also, the only examples of using 'isEqual' I could find in the NSDictionary class reference are discussions of equal keys, not equal dictionaries.

Either way, I don't see an API contract.


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  • Follow-Ups:
    • Re: copy & isEqual nightmares
      • From: Ken Thomases <email@hidden>
References: 
 >copy & isEqual nightmares (From: James Maxwell <email@hidden>)
 >Re: copy & isEqual nightmares (From: Uli Kusterer <email@hidden>)
 >Re: copy & isEqual nightmares (From: Quincey Morris <email@hidden>)
 >Re: copy & isEqual nightmares (From: James Montgomerie <email@hidden>)
 >Re: copy & isEqual nightmares (From: Quincey Morris <email@hidden>)
 >Re: copy & isEqual nightmares (From: Uli Kusterer <email@hidden>)
 >Re: copy & isEqual nightmares (From: Quincey Morris <email@hidden>)
 >Re: copy & isEqual nightmares (From: Ken Thomases <email@hidden>)
 >Re: copy & isEqual nightmares (From: Quincey Morris <email@hidden>)
 >Re: copy & isEqual nightmares (From: Ken Thomases <email@hidden>)

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