Re: [Foo new] vs [[Foo alloc] init]:
Re: [Foo new] vs [[Foo alloc] init]:
- Subject: Re: [Foo new] vs [[Foo alloc] init]:
- From: Gregory Weston <email@hidden>
- Date: Fri, 15 Feb 2008 16:55:18 -0500
Keith Duncan wrote:
As far as I understand, [Foo new] is exactly equivalent to [[Foo
alloc] init]
Correct.
Incorrect. Based on the documentation new (by default) does setup
work analogous to alloc and then invokes init before returning the
object. It does not actually use the alloc method, though, which
means it's entirely possible for new to not be equivalent to an alloc/
init pair.
Chaining alloc and init is just the in vogue convention as far as I
know. I've been told that -new used to be a popular way of doing it
back in the days of NeXTStep.
It's more than just the 'in vogue convention' though. The point was
to recognize that allocation and initialization are distinct actions
and there's benefit in having them be separable. With alloc/init you
can change one of the phases without concern for the other.
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