Re: Is there a warning for this?
Re: Is there a warning for this?
- Subject: Re: Is there a warning for this?
- From: Izidor Jerebic <email@hidden>
- Date: Tue, 29 Dec 2009 09:49:20 +0100
Well, the documentation says <http://gemma.apple.com/mac/library/documentation/Cocoa/Conceptual/CodingGuidelines/Articles/NamingBasics.html
>:
Avoid the use of the underscore character as a prefix meaning
private, especially in methods. Apple reserves the use of this
convention
Note the "especially", and also note the existence of many underscored
instance variables in appkit and foundation.
I understand it as direction to avoid underscore in *any* name, not
just method name.
It is true that instance variables are not as critical as methods. If
you subclass appkit class and use underscored instance variable which
clashes with superclass, compiler will warn you and your code won't
compile, so no real damage will occur, as opposed to clashing private
method where your program will happily compile and then sometimes
crash at runtime. The only problem can be if future framework class
adds instance variable which clashes with yours, thus making your
existing code un-compilable. So using underscored instance variables
is not dangerous, but it is asking for trouble, and why would you want
that?
izidor
On 29.12.2009, at 6:36, Sean McBride wrote:
Kyle Sluder (email@hidden) on 2009-12-24 9:20 AM said:
Otherwise, give your ivars a prefix (underscore is
verboten according to Apple, since they use it in the frameworks).
This is a common misconception. The underscore is reserved by Apple
for
method names, not ivars. That's how they can safely add new methods
to
public classes without conflicting with our subclasses.
I'd suggest you _do_ use underscore as your ivar prefix.
See also:
<http://gemma.apple.com/mac/library/documentation/Cocoa/Conceptual/
CodingGuidelines/Articles/NamingIvarsAndTypes.html>
<http://lists.apple.com/archives/Cocoa-dev/2009/Jan/msg00608.html>
Sean
--
"Terrorism is the war of the poor, and war is terrorism of the rich" -
Sir Peter Ustinov
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