Re: A Data Object in Cocoa
Re: A Data Object in Cocoa
- Subject: Re: A Data Object in Cocoa
- From: "Michael Ash" <email@hidden>
- Date: Sat, 10 Jan 2009 11:48:57 -0500
On Sat, Jan 10, 2009 at 7:45 AM, Alastair Houghton
<email@hidden> wrote:
> On 10 Jan 2009, at 00:11, Adam Foltzer wrote:
>
>> I've noticed a pattern in some Apple code where the instance variables are
>> all prefixed with an underscore, but the property name, and therefore the
>> accessors, are what you'd expect.
>
> Except that there's a long-standing rule that we shouldn't use leading
> underscores for either member variable names or private method names because
> names beginning with underscore are reserved for Apple's own use (even
> member variable names, IIRC). So if you're going to use a prefix, it's
> probably best to pick something like "m" (for "member").
>
> But in general I think it's better not to prefix the names of member
> variables, and then in your initialisers, to use a different name for the
> argument.
Personally I have found that prefixing my instance variables is one of
the best things I've ever done for code clarity. Being able to
instantly tell that a particular variable is an instance variable or
not is extremely valuable, at least to me. Tastes may vary.
As for underscore being reserved, I have never been able to figure out
any consequence of a conflict with an Apple ivar name. It may cause
your source to fail to compile, but it won't cause any *binary*
compatibility problems, which is the real menace.
Mike
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