On Sun, Apr 6, 2008 at 4:39 PM, John Stiles <[EMAIL PROTECTED]> wrote:
> You can't be KVC compliant if you use prefixes like m_, so this limits your
> potential for using things like bindings.
Of course you can, as long as you define accessors:
//Pre-Leopard:
@interface MyObject : NSObject {
int m_property;
}
-(int)property;
-(void)setProperty:(int)value;
@end
@implementation MyObject
-(int)property { return m_property; }
-(void)setProperty:(int)value { m_property = value; }
@end
Post-Leopard:
@interface MyObject : NSObject {
int m_property;
}
@property int property;
@end
@implementation MyObject
@synthesize property=m_property;
@end
And, in the future when/if you can target 64-bit only, you can avoid
using named instance variables altogether:
@interface MyObject : NSObject
@property int property;
@end
@implementation MyObject
@synthesize property;
@end
> When I write C++, I am also a fan of m_, but it's just not appropriate for
> Cocoa since it basically means you're fighting against the frameworks.
Though I will concede this point, whenever possible, I like my ivar
and the property that it backs to have the exact same name.
>
>
> Scott Andrew wrote:
>
> >
> >
> >
> > See i still use m_xxx. Alot of it is just old habit from C++ land. But it
> really stands out to me m_ tells me its a member. We are also converting a
> lot non-mac programmers to mac so I think for them it makes the code a bit
> easier to read. I don't use the how hungarian (lpcstr for consant string
> etc), but definately prefer m_myTitle to _myTitle. Again m_ to me just
> screams member.
> >
> > I have also always reserved the use of "the" for globals. To me is says a
> single instance not a ivar. theWebConnection says there is one global web
> connection.
> >
> > So does this mean I am the laughing stock of the Obj-C collective.. I hope
> not. I think that style (unless enforced by job) is a personal preference.
> >
> > Scott
> >
> > On Apr 3, 2008, at 10:58 AM, Rob Napier wrote:
> >
> >
> > > On Thu, Apr 3, 2008 at 12:45 PM, Jens Alfke <[EMAIL PROTECTED]> wrote:
> > >
> > >
> > > >
> > > > On 3 Apr '08, at 9:29 AM, Richard Somers wrote:
> > > >
> > > > There is a common practice of prefixing instance variable names with
> "_",
> > > >
> > > > > a single underscore character.
> > > > >
> > > > >
> > > >
> > > > And it's a very good idea to do so, IMHO. (The exact prefix isn't
> > > > important, just as long as it's easy to distinguish ivars from local
> vars at
> > > > a glance.)
> > > >
> > >
> > >
> > > Apple reserves the use of leading underscores for it's own use:
> > >
> > >
> > >
> http://developer.apple.com/documentation/Cocoa/Conceptual/CodingGuidelines/Articles/NamingBasics.html#//apple_ref/doc/uid/20001281
> > >
> > > While they append the phrase "especially in methods," they do mean for
> > > everything, and you can collide with them if you name your own
> identifiers
> > > (including instance variables) with leading underscores.
> > >
> > > I used to agree with your sentiment on distinguishing ivars with local
> vars
> > > until I discovered the following:
> > >
> > > 1. Leading underscores really will cause you to collide with Apple and
> it
> > > really did blow up in my face.
> > >
> > > 2. Leading "m" makes you look like a C++ programmer and other ObjC
> > > programmers will laugh at you. You can take that for what it's worth,
> but
> > > it's worth keeping in mind if you're going to work on large projects
> with
> > > other programmers. "Other ObjC programmers will laugh at you" seems to
> be a
> > > common mechanism for keeping large projects sane. Java guys use their
> > > compiler. We use peer pressure. Which you think is a better way to
> enforce
> > > good practice will determine whether you are happier as a Java or ObjC
> > > programmer.
> > >
> > > 3. XCode 3 now provides good color coding to distinguish ivars from
> local
> > > vars.
> > >
> > > 4. And besides, if you would use accessors properly, ivars should very
> > > seldom show up in your code so you shouldn't have confusion (this being
> the
> > > cause of #2 above).
> > >
> > > Personally, I find the lack of good naming conventions for instance
> > > variables one of the few things that annoys me in ObjC. That said, I've
> > > found that with proper accessor usage, it doesn't really matter, and
> with
> > > XCode3 you can do fine even without proper accessor usage.
> > >
> > > But in any case, you shouldn't use underscores.
> > >
> > > -Rob
> > >
> > > --
> > > Rob Napier -- Software and Security Consulting -- http://robnapier.net
> > > _______________________________________________
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