On 11 Mar 2008, at 21:09, Stuart Malin wrote:
Thanks Chris.
You are right on -- I had more than one method signature with the
same, generic style name.
My rationale for departing from the canonical approach is because
then I get a bit of extra type checking at compile time.
Given the canonical approach of returning id, one can define an
interface for a class with an ivar:
classA *aIvar
and in the implementation, assign any sort of object to it.
aIvar = [NSString stringWithString:@"OOPS"];
With my approach, when I define the interface for classA's
initializer to be:
- (classA*) - initClassA ......
then if I inadvertently assign an allocation to the wrong ivar:
NSString *s;
// some code later ...
s = [[classA alloc] init];
the compiler will issue a warning. With the canonical approach of
the initializer returning type id, it wouldn't.
Now, I know this catches a puny amount of possible errors, but that
is the reason why I deviated from the ordinary practice.
Given this, I think it would have been beneficial if
[className alloc]
returned of the className type, rather than id. But I am certain
there are numerous reasons against doing so, as otherwise it would
likely have been implemented that way.
Well because you simply cannot do this. Somehow every single class
would have to declare their own version of the +alloc method that
returns an object of their specific type. Do you really want the
hassle of having to do that every single time you create a subclass?
This is not something that can be changed in the framework, but would
have to be a change to the language/runtime.
That aside, your suggestion to use protocol declaration for the
delegate is something I had planned to investigate. Thanks for the
further tips.
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