If you think about it, it becomes clear why convenience methods return
autoreleased objects. As a heuristic, whoever retains an object should
release it. Since you're having the class method perform an implicit
retain (by calling alloc) then it needs to do a release. It obviously
cannot release the object before returning it to you, so its only
choice is to autorelease. When you call alloc yourself, then you are
the one responsible for releasing at a later time.
Luke
On Nov 20, 2008, at 5:57 PM, Dave DeLong wrote:
On 20 Nov, 2008, at 6:54 PM, Klaus Backert wrote:
"Class factory methods are implemented by a class as a convenience
for clients. They combine allocation and initialization in one step
and return the created object autoreleased. These methods are of
the form + (type)className... (where className excludes any prefix)."
"autoreleased" !
Because of this the following statements are identical, as far as I
can see:
NSString *blah = [[[NSString alloc] init] autorelease];
NSString *blah = [NSString string];
Aren't they?
Yes. They are identical.
Dave
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