Re: Memory Management

• Subject: Re: Memory Management
• From: email@hidden
• Date: Wed, 30 Jul 2003 22:10:24 -0400

Am Mittwoch, 30.07.03 um 01:13 Uhr schrieb John Randolph:

On Tuesday, July 29, 2003, at 11:23 AM, Nat! wrote:

Autorelease pools have some clear semantics. Every object added to
an autorelease pool gains a property, a guaranteed minimum lifetime.

Umm, no.

An object added to an autorelease pool is going to get a -release
message whenever the pool gets released, and that's all. The act of
adding it to the pool has no effect of guaranteeing a minimum >
lifetime.

-jcr

ok, I should have explicitily stated the assumption that the object is
added retained.

But with my answer I am obscuring my own point, that adding it retained
to the pool does guarantee a minimum lifetime. As John states "An
object added to an autorelease pool is going to get a -release message
whenever the pool gets released". That's exactly the minimum lifetime.
It can be longer, but it can't be less.

And adding it non-retained and not crashing is a trick you must show me
as

s = [[NSString alloc] initWithFormat:@"My retain count is 1"]
[s autorelease]; // yes its retained
[s release]; // bad idea

In this example ownership is transferred to the autorelease pool. s can
not die earlier than the enclosing autorelease pool.

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