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Re: Does setFormatter() retain?
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Re: Does setFormatter() retain?


  • Subject: Re: Does setFormatter() retain?
  • From: Andreas Falkenhahn <email@hidden>
  • Date: Wed, 24 Aug 2016 22:24:30 +0200

On 24.08.2016 at 22:14 Ben Kennedy wrote:

>> On 24 Aug 2016, at 1:04 pm, Andreas Falkenhahn <email@hidden> wrote:

>> I have read Apple's memory management guide on retain/release and
>> I think I've basically got it, but there's just one thing that
>> I'm not confident about and that is "setXXX" methods which accept an
>> NSObject parameter and I don't know how I can know whether the
>> "setXXX" retains or not.

> Why do you think you need to know?

If it retains, I could just do the following:

    [textField setFormatter:formatter];
    [formatter release];

And I wouldn't have to worry about "formatter" any longer. If it doesn't retain,
the above isn't possible.

Another example: "addSubview" retains, so I can just do:

    [[win contentView] addSubview:button];
    [button release];

And I'm done with "button." That's much more convenient than having to
keep "button" for much longer...

>
> That's the concern of the API
> you're calling. If it needs to retain the object you're passing it,
> then it will. If it doesn't, it won't.

I still think I should know this so that I know when I should say
"release" (see above)

> The legacy delegate stuff that you cited calls out the fact that
> they don't because it is contrary to normal expectations, and thus
> requires explicit concern by the caller.

So are you saying that the standard for setXXX methods is retain?
And if a setXXX method doesn't retain, then it's explicitly mentioned
in the doc?

--
Best regards,
 Andreas Falkenhahn                            mailto:email@hidden

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  • Follow-Ups:
    • Re: Does setFormatter() retain?
      • From: Graham Cox <email@hidden>
    • Re: Does setFormatter() retain?
      • From: Ben Kennedy <email@hidden>
References: 
 >Does setFormatter() retain? (From: Andreas Falkenhahn <email@hidden>)
 >Re: Does setFormatter() retain? (From: Ben Kennedy <email@hidden>)

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