Re: Abstract class with single subclass
Re: Abstract class with single subclass
- Subject: Re: Abstract class with single subclass
- From: Freddie Tilley <email@hidden>
- Date: Wed, 27 May 2009 17:07:03 +0200
On 27 mei 2009, at 16:51, Michael Ash wrote:
On Wed, May 27, 2009 at 9:48 AM, Freddie Tilley <email@hidden>
wrote:
If I would want to allocate a class which allocates a single subclass
instead, to
hide the class implementation details
would this be the correct way of doing it?
The following code would be in the BaseClass
+ (id)allocWithZone:(NSZone*)aZone
{
if ([[self class] isEqualTo:[BaseClass class]])
Oops, I forgot to mention one other thing. This works but is
excessively wordy and strange. In a class method, [self class] is
equivalent to self. -isEqualTo: is a method that exists for
AppleScript support; the proper one to use is -isEqual:. However,
since class equality is always the same as object identity, you don't
need to use a method at all, but can shorten it down to if(self ==
[BaseClass class]).
Thanks for your help!
Freddie Tilley
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