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Re: Method not seeing array as array
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Re: Method not seeing array as array


  • Subject: Re: Method not seeing array as array
  • From: Evan Schoenberg <email@hidden>
  • Date: Thu, 3 Feb 2005 18:33:03 -0600

Using self = [super init] allows for the possibility that a superclass somewhere along the hierarchy returns or will later in development return an object which may not be same as the alloc / allocWithZone:... I've been bitten by that before. For example, if you subclass NSMutableSet, if you just do [super init] rather than self = [super init] you are going to be returning the wrong object in many cases.

-Evan

On Feb 3, 2005, at 5:49 AM, Marco Scheurer wrote:

When you inherit from a class, you usually know what super will do, and it is not necessary to blindly use "defensive programming" and test against everything. When inheriting from NSObject, how could init return anything else than self?

There's a good reason to write:

self = [super init];

and that's because init returns an object, so we may just as well use it rather than documenting the fact that we don't care by writing:

(void) [super init];

Other than that, it is not necessary in that case. Also, the value returned by NSObject's init can not be nil, so I usually don't put that test in my code.

No flame, please, all this is an opinion and a matter of taste. I know that the doc says "Programs should therefore always use the object returned by init, and not necessarily the one returned by alloc or allocWithZone:, in subsequent code."...

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References: 
 >Method not seeing array as array (From: Michael Swan <email@hidden>)
 >Re: Method not seeing array as array (From: Andrew Farmer <email@hidden>)
 >Re: Method not seeing array as array (From: Marco Scheurer <email@hidden>)
 >Re: Method not seeing array as array (From: Andrew Farmer <email@hidden>)
 >Re: Method not seeing array as array (From: Marco Scheurer <email@hidden>)

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