Re: Gestalt
Re: Gestalt
- Subject: Re: Gestalt
- From: Conrad Shultz <email@hidden>
- Date: Wed, 21 Sep 2011 15:09:08 -0700
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On 9/21/11 2:22 PM, Charles Srstka wrote:
> Why not? I find it to be safer than checking for the existence of
> a method, because you never know if that method might have actually
> have existed before it went public, but in a less stable form or
> with different behavior. If this is the case, then just checking
> whether the method exists and calling it could produce who knows
> what behavior on older systems.
I have always been under the impression that Apple recommends weak
linking and run-time checks. It's what's covered in the (aging) Tech
Note 2064 for OS X and, IIRC, is what is discussed in, for example,
the original iPad/iOS 3.2 release notes.
What are some examples of breakage happening under this scenario? I'd
like to be on the lookout myself if I indeed did put too much faith in
the documentation.
> There’s also the case where an API exists, but is buggy on older
> versions, causing you to want to avoid that API unless you’re
> running at least a certain version of OS X (for example, -[NSURL
> URLByDeletingLastPathComponent] before Lion).
That is an interesting case that I hadn't really considered, and I
concede that it is a situation where checking the OS version (or, at
least, NSAppKitVersionNumber) may be the best solution.
- --
Conrad Shultz
Synthetiq Solutions
www.synthetiqsolutions.com
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