Re: Mixing Obj-C and C "methods"
Re: Mixing Obj-C and C "methods"
- Subject: Re: Mixing Obj-C and C "methods"
- From: Kyle Sluder <email@hidden>
- Date: Tue, 30 Jul 2013 12:10:14 -0700
On Tue, Jul 30, 2013, at 11:49 AM, Lee Ann Rucker wrote:
>
> On Jul 30, 2013, at 8:48 AM, Andy Lee wrote:
>
> > On Jul 30, 2013, at 11:25 AM, Scott Ribe <email@hidden> wrote:
> >> On Jul 30, 2013, at 9:08 AM, Andy Lee <email@hidden> wrote:
> >>
> >>> I think it's subject to the same criticisms as *any* direct access to ivars, although I agree it feels sketchier when done in plain C for some reason.
> >>
> >> Yes. Because what is the point of plain C functions in Objective-C files? Local helpers that are not OOP, and do not go through method dispatch overhead. To turn around and inject direct access to ivars in those is really mixing metaphors.
> >
> > One reason people might directly access ivars applies to methods as well as functions: the class may not have a getter method for that ivar. Now, there is a school of thought that says ivars should *always* be accessed via a getter method, except in init and dealloc, and if necessary a "private" getter should be added. If one does not subscribe to that school of thought, and accesses ivars directly in methods, I personally don't think it's a *huge* deal to do so in functions, especially since the function has to be inside the @implementation section and it won't be a commonplace thing. But as always, I'm happy to code to the accepted norms of whatever team I'm on.
>
> I'd go for [foo valueForKey:@"privateIvar"] over foo->privateIvar.
Why? It's morally equivalent, except it's slower, opaque to the
compiler, and reliant on the horrible default behavior of
+accessInstanceVariablesDirectly returning YES.
As far as I'm concerned, C functions that exist inside an
@implementation block are statically-dispatched instance methods.
--Kyle Sluder
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