Re: semantics of init
Re: semantics of init
- Subject: Re: semantics of init
- From: Marcel Weiher <email@hidden>
- Date: Wed, 4 Jun 2003 10:09:03 +0200
If you want to be even safer, you should probably do something like
this:
self = [super init];
if ([self isKindOfClass: [MyClass class]])
{
/* access MyClass instance vars here */
}
return self;
Ouch. I certainly wouldn't go that far, and definitely not in the
general case.
Anyway, the pattern I use is the following:
-init
{
self=[super init];
[self setDict:[NSMutableDictionary dictionary]];
[self setArray:[NSMutableArray array];
return self;
}
So I use my accessors to avoid direct instance variable access. This
protects me from self being nil without the test, and it even protects
me from a different type of object being returned. (If the object
being returned isn't compatible in the message-interface, then it is
just broken).
Messaging is good.
Marcel
--
Marcel Weiher Metaobject Software Technologies
email@hidden www.metaobject.com
Metaprogramming for the Graphic Arts. HOM, IDEAs, MetaAd etc.
f0249ab8b1af193ef5addcf39fdff5ca
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